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Permafrost
Permafrost
	Map showing extent and types of permafrost in the Northern Hemisphere
Used in	International Permafrost Association
Climate	High latitudes, alpine regions

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Permafrost is soil or underwater sediment which continuously remains below 0 °C (0 °F) for two or more years. Land-based permafrost can include the surface layer of the soil, but if the surface is too warm, it may still occur within a few centimeters of the surface down to hundreds of meters. It usually consists of ice holding in place a combination of various types of soil, sand, and rock, though in ice-free ground, perennially frozen non-porous bedrock can serve the same role.^[1]

Around 15% of the Northern Hemisphere or 11% of the global surface is underlain by permafrost,^[2] with the total area of around 18 million km².^[3] This includes substantial areas of Alaska, Greenland, Canada and Siberia. It is also located in high mountain regions, with the Qinghai–Tibet Plateau a prominent example. Only a minority of permafrost exists in the Southern Hemisphere, where it is consigned to mountain slopes like in the Andes or the Southern Alps of New Zealand, and beneath the massive ice sheets of the Antarctic.^[4]

Permafrost contains large amounts of dead biomass which had accumulated throughout millennia without having had the chance to fully decompose and release its carbon, making tundra soil a carbon sink.^[4] As global warming heats the ecosystem, frozen soil thaws and becomes warm enough for decomposition to start anew, accelerating permafrost carbon cycle in one of the effects of climate change. Depending on conditions at the time of thaw, decomposition can either release carbon dioxide or methane, and these greenhouse gas emissions act as a climate change feedback.^[5]^[6]^[7]The emissions from thawing permafrost will have a sufficient impact on the climate to impact global carbon budgets. Exact estimates of permafrost emissions are hard to model because of the uncertainty about different thaw processes, but there's a widespread agreement they'll be smaller than anthropogenic emissions and not large enough to result in "runaway warming".^[8]

In addition to its climate impact, permafrost thaw also brings additional risks. Formerly frozen ground often contains enough ice that when it thaws, hydraulic saturation is suddenly exceeded, so the ground shifts substantially and may even collapse outright. Many buildings and other infrastructure were built on permafrost when it was frozen and stable, and are also vulnerable to collapse if it thaws.^[9] Estimates suggest nearly 70% of such infrastructure is at risk by 2050, and that the associated costs could rise to tens of billions of dollars in the second half of the century.^[10] Additionally, there are toxic waste dumps in the permafrost, as well as the natural mercury deposits, which are liable to leak and pollute the environment as the warming progresses. Lastly, there have been concerns about potentially pathogenic microorganisms surviving the thaw and contributing to future epidemics and pandemics, although this risk is more speculative than the others.^[11]^[12]

Study of permafrost

In contrast to the relative dearth of reports on frozen ground in North America prior to World War II, a vast literature on basic permafrost science and the engineering aspects of permafrost was available in Russian. Some Russian authors relate permafrost research with the name Alexander von Middendorff (1815–1894). However, Russian scientists also realized, that Karl Ernst von Baer must be given the attribute "founder of scientific permafrost research". In 1843, Baer's original study “materials for the study of the perennial ground-ice” was ready to be printed. Baer's detailed study consists of 218 pages and was written in German language, as he was a Baltic German scientist. He was teaching at the University of Königsberg and became a member of the St Petersburg Academy of Sciences. This world's first permafrost textbook was conceived as a complete work and ready for printing in 1843. But it remained lost for around 150 years. However, from 1838 onwards, Baer published several individual publications on permafrost. The Russian Academy of Sciences honoured Baer with the publication of a tentative Russian translation of his study in 1942.^[13]

These facts were completely forgotten after the Second World War. Thus in 2001 the discovery of the typescript from 1843 in the library archives of the University of Giessen and its annotated publication was a scientific sensation. The full text of Baer's original work is available online (234 pages).^[13] The editor added to the facsimile reprint a preface in English, two colour permafrost maps of Eurasia and some figures of permafrost features. Baer's text is introduced with detailed comments and references on additional 66 pages written by the Estonian historian Erki Tammiksaar. The work is notable because Baer's observations on permafrost distribution and periglacial morphological descriptions are seen as largely correct to the present day.^[13] With his compilation and analysis of all available data on ground ice and permafrost, Baer laid the foundation for the modern permafrost terminology. Baer's southern limit of permafrost in Eurasia drawn in 1843 corresponds well with the actual southern limit on the Circum-Arctic Map of Permafrost and Ground Ice Conditions of the International Permafrost Association (edited by J. Brown et al.).^[14]

Beginning in 1942, Siemon William Muller delved into the relevant Russian literature held by the Library of Congress and the U.S. Geological Survey Library so that he was able to furnish the government an engineering field guide and a technical report about permafrost by 1943",^[15] the year in which he coined the term as a contraction of permanently frozen ground.^[16] Although originally classified (as U.S. Army. Office of the Chief of Engineers, Strategic Engineering Study, no. 62, 1943),^[16]^[17]^[18]^[19] in 1947 a revised report was released publicly, which is regarded as the first North American treatise on the subject.^[15]^[19]

Classification and extent

Permafrost is soil, rock or sediment that is frozen for more than two consecutive years. In areas not covered by ice, it exists beneath a layer of soil, rock or sediment, which freezes and thaws annually and is called the "active layer".^[20] In practice, this means that permafrost occurs at an mean annual temperature of −2 °C (28.4 °F) or below. Active layer thickness varies with the season, but is 0.3 to 4 meters thick (shallow along the Arctic coast; deep in southern Siberia and the Qinghai-Tibetan Plateau).^{[citation needed]}

The extent of permafrost is displayed in terms of permafrost zones, which are defined according to the area underlain by permafrost as continuous (90%–100%), discontinuous (50%–90%), sporadic (10%–50%), and isolated patches (10% or less).^[14] These permafrost zones cover together approximately 22% of the Northern Hemisphere. Continuous permafrost zone covers slightly more than half of this area, discontinuous permafrost around 20 percent, and sporadic permafrost together with isolated patches little less than 30 percent.^[21] Because permafrost zones are not entirely underlain by permafrost, only 15% of the ice-free area of the Northern Hemisphere is actually underlain by permafrost.^[2] Most of this area is found in Siberia, northern Canada, Alaska and Greenland. Beneath the active layer annual temperature swings of permafrost become smaller with depth. The deepest depth of permafrost occurs where geothermal heat maintains a temperature above freezing. Above that bottom limit there may be permafrost with a consistent annual temperature—"isothermal permafrost".^[22]

Continuity of coverage

Permafrost typically forms in any climate where the mean annual air temperature is lower than the freezing point of water. Exceptions are found in humid boreal forests, such as in Northern Scandinavia and the North-Eastern part of European Russia west of the Urals, where snow acts as an insulating blanket. Glaciated areas may also be exceptions. Since all glaciers are warmed at their base by geothermal heat, temperate glaciers, which are near the pressure-melting point throughout, may have liquid water at the interface with the ground and are therefore free of underlying permafrost.^[23] "Fossil" cold anomalies in the Geothermal gradient in areas where deep permafrost developed during the Pleistocene persist down to several hundred metres. This is evident from temperature measurements in boreholes in North America and Europe.^[24]

Discontinuous permafrost

The below-ground temperature varies less from season to season than the air temperature, with mean annual temperatures tending to increase with depth as a result of the geothermal crustal gradient. Thus, if the mean annual air temperature is only slightly below 0 °C (32 °F), permafrost will form only in spots that are sheltered—usually with a northern or southern aspect (in north and south hemispheres respectively) —creating discontinuous permafrost. Usually, permafrost will remain discontinuous in a climate where the mean annual soil surface temperature is between −5 and 0 °C (23 and 32 °F). In the moist-wintered areas mentioned before, there may not be even discontinuous permafrost down to −2 °C (28 °F). Discontinuous permafrost is often further divided into extensive discontinuous permafrost, where permafrost covers between 50 and 90 percent of the landscape and is usually found in areas with mean annual temperatures between −2 and −4 °C (28 and 25 °F), and sporadic permafrost, where permafrost cover is less than 50 percent of the landscape and typically occurs at mean annual temperatures between 0 and −2 °C (32 and 28 °F).^[25] In soil science, the sporadic permafrost zone is abbreviated SPZ and the extensive discontinuous permafrost zone DPZ.^[26] Exceptions occur in un-glaciated Siberia and Alaska where the present depth of permafrost is a relic of climatic conditions during glacial ages where winters were up to 11 °C (20 °F) colder than those of today.

Continuous permafrost

Estimated extent of alpine permafrost by region^[27]
Locality	Area
Qinghai-Tibet Plateau	1,300,000 km² (500,000 sq mi)
Khangai-Altai Mountains	1,000,000 km² (390,000 sq mi)
Brooks Range	263,000 km² (102,000 sq mi)
Siberian Mountains	255,000 km² (98,000 sq mi)
Greenland	251,000 km² (97,000 sq mi)
Ural Mountains	125,000 km² (48,000 sq mi)
Andes	100,000 km² (39,000 sq mi)
Rocky Mountains (US and Canada)	100,000 km² (39,000 sq mi)
Alps	80,000 km² (31,000 sq mi)
Fennoscandian mountains	75,000 km² (29,000 sq mi)
Remaining	<50,000 km² (19,000 sq mi)

At mean annual soil surface temperatures below −5 °C (23 °F) the influence of aspect can never be sufficient to thaw permafrost and a zone of continuous permafrost (abbreviated to CPZ) forms. A line of continuous permafrost in the Northern Hemisphere^[28] represents the most southern border where land is covered by continuous permafrost or glacial ice. The line of continuous permafrost varies around the world northward or southward due to regional climatic changes. In the southern hemisphere, most of the equivalent line would fall within the Southern Ocean if there were land there. Most of the Antarctic continent is overlain by glaciers, under which much of the terrain is subject to basal melting.^[29] The exposed land of Antarctica is substantially underlain with permafrost,^[30] some of which is subject to warming and thawing along the coastline.^[31]

Alpine permafrost

Alpine permafrost occurs at elevations with low enough average temperatures to sustain perennially frozen ground; much alpine permafrost is discontinuous.^[32] Estimates of the total area of alpine permafrost vary. Bockheim and Munroe^[27] combined three sources and made the tabulated estimates by region, totaling 3,560,000 km² (1,370,000 sq mi).

Alpine permafrost in the Andes has not been mapped.^[33] Its extent has been modeled to assess the amount of water bound up in these areas.^[34] In 2009, a researcher from Alaska found permafrost at the 4,700 m (15,400 ft) level on Africa's highest peak, Mount Kilimanjaro, approximately 3° south of the equator.^[35]

Subsea permafrost

Subsea permafrost occurs beneath the seabed and exists in the continental shelves of the polar regions.^[36] These areas formed during the last ice age, when a larger portion of Earth's water was bound up in ice sheets on land and when sea levels were low. As the ice sheets melted to again become seawater, the permafrost became submerged shelves under relatively warm and salty boundary conditions, compared to surface permafrost. Therefore, subsea permafrost exists in conditions that lead to its diminishment. According to Osterkamp, subsea permafrost is a factor in the "design, construction, and operation of coastal facilities, structures founded on the seabed, artificial islands, sub-sea pipelines, and wells drilled for exploration and production."^[37] It also contains gas hydrates in places, which are a "potential abundant source of energy" but may also destabilize as subsea permafrost warms and thaws, producing large amounts of methane gas, which is a potent greenhouse gas.^[37]^[38]^[39] Scientists report with high confidence that the extent of subsea permafrost is decreasing, and 97% of permafrost under Arctic ice shelves is currently thinning.^[40]^[8]^: 1281

Past extent of permafrost

At the Last Glacial Maximum, continuous permafrost covered a much greater area than it does today, covering all of ice-free Europe south to about Szeged (southeastern Hungary) and the Sea of Azov (then dry land)^[41] and East Asia south to present-day Changchun and Abashiri.^[42] In North America, only an extremely narrow belt of permafrost existed south of the ice sheet at about the latitude of New Jersey through southern Iowa and northern Missouri, but permafrost was more extensive in the drier western regions where it extended to the southern border of Idaho and Oregon.^[43] In the southern hemisphere, there is some evidence for former permafrost from this period in central Otago and Argentine Patagonia, but was probably discontinuous, and is related to the tundra. Alpine permafrost also occurred in the Drakensberg during glacial maxima above about 3,000 metres (9,840 ft).^[44]^[45]

Manifestations

Time required for permafrost to reach depth at Prudhoe Bay, Alaska^[46]
Time (yr)	Permafrost depth
1	4.44 m (14.6 ft)
350	79.9 m (262 ft)
3,500	219.3 m (719 ft)
35,000	461.4 m (1,514 ft)
100,000	567.8 m (1,863 ft)
225,000	626.5 m (2,055 ft)
775,000	687.7 m (2,256 ft)

Base depth

Permafrost extends to a base depth where geothermal heat from the Earth and the mean annual temperature at the surface achieve an equilibrium temperature of 0 °C.^[47] The base depth of permafrost reaches 1,493 m (4,898 ft) in the northern Lena and Yana River basins in Siberia.^[48] The geothermal gradient is the rate of increasing temperature with respect to increasing depth in the Earth's interior. Away from tectonic plate boundaries, it is about 25–30 °C/km (124–139 °F/mi) near the surface in most of the world.^[49] It varies with the thermal conductivity of geologic material and is less for permafrost in soil than in bedrock.^[47]

Calculations indicate that the time required to form the deep permafrost underlying Prudhoe Bay, Alaska was over a half-million years.^[46]^[50] This extended over several glacial and interglacial cycles of the Pleistocene and suggests that the present climate of Prudhoe Bay is probably considerably warmer than it has been on average over that period. Such warming over the past 15,000 years is widely accepted.^[46] The table to the right shows that the first hundred metres of permafrost forms relatively quickly but that deeper levels take progressively longer.

Massive ground ice

When the ice content of a permafrost exceeds 250 percent (ice to dry soil by mass) it is classified as massive ice. Massive ice bodies can range in composition, in every conceivable gradation from icy mud to pure ice. Massive icy beds have a minimum thickness of at least 2 m and a short diameter of at least 10 m.^[51] First recorded North American observations were by European scientists at Canning River, Alaska in 1919.^[52] Russian literature provides an earlier date of 1735 and 1739 during the Great North Expedition by P. Lassinius and Kh. P. Laptev, respectively.^[53] Two categories of massive ground ice are buried surface ice and intrasedimental ice^[54] (also called constitutional ice).^[53]

Buried surface ice may derive from snow, frozen lake or sea ice, aufeis (stranded river ice) and—probably the most prevalent—buried glacial ice.^[55]

Intrasedimental ice forms by in-place freezing of subterranean waters and is dominated by segregational ice which results from the crystallizational differentiation taking place during the freezing of wet sediments, accompanied by water migrating to the freezing front.^[53]

Intrasedimental or constitutional ice has been widely observed and studied across Canada and also includes intrusive and injection ice.^[52]^[53]

Additionally, ice wedges—a separate type of ground ice—produce recognizable patterned ground or tundra polygons. Ice wedges form in a pre-existing geological substrate and were first described in 1919.^[52]^[53]

Landforms

Permafrost processes manifest themselves in large-scale land forms, such as palsas and pingos^[56] and smaller-scale phenomena, such as patterned ground found in arctic, periglacial and alpine areas.^[57] In ice-rich permafrost areas, melting of ground ice initiates thermokarst landforms such as thermokarst lakes, thaw slumps, thermal-erosion gullies, and active layer detachments.^[58]^[59]

A group of palsas, as seen from above, formed by the growth of ice lenses.
A peat plateau complex south of Fort Simpson, Northwest Territories
Pingos near Tuktoyaktuk, Northwest Territories, Canada
Ground polygons
Stone rings on Spitsbergen
Ice wedges seen from top
Solifluction on Svalbard
Contraction crack (ice wedge) polygons on Arctic sediment.
Cracks forming at the edges of the Storflaket permafrost bog in Sweden.

Ecology

Only plants with shallow roots can survive in the presence of permafrost. Black spruce tolerates limited rooting zones, and dominates flora where permafrost is extensive. Likewise, animal species which live in dens and burrows have their habitat constrained by the permafrost, and these constraints also have a secondary impact on interactions between species within the ecosystem.^[60]

The permafrost carbon cycle (Arctic Carbon Cycle) deals with the transfer of carbon from permafrost soils to terrestrial vegetation and microbes, to the atmosphere, back to vegetation, and finally back to permafrost soils through burial and sedimentation due to cryogenic processes. Some of this carbon is transferred to the ocean and other portions of the globe through the global carbon cycle. The cycle includes the exchange of carbon dioxide and methane between terrestrial components and the atmosphere, as well as the transfer of carbon between land and water as methane, dissolved organic carbon, dissolved inorganic carbon, particulate inorganic carbon and particulate organic carbon.^[61]

Construction on permafrost

Building on permafrost is difficult because the heat of the building (or pipeline) can warm the permafrost and destabilize the structure. Warming can result in thawing of the soil and its consequent weakening of support for a structure as the ice content turns to water; alternatively, where structures are built on piles, warming can cause movement through creep because of the change of friction on the piles even as the soil remains frozen.^[62] Additionally, there is no ground water available in an area underlain with permafrost. Any substantial settlement or installation needs to make some alternative arrangement to obtain water.^[63] Three common solutions include: using foundations on wood piles, a technique pioneered by Soviet engineer Mikhail Kim in Norilsk;^[64] building on a thick gravel pad (usually 1–2 metres/3.3–6.6 feet thick); or using anhydrous ammonia heat pipes.^[65] The Trans-Alaska Pipeline System uses heat pipes built into vertical supports to prevent the pipeline from sinking and the Qingzang railway in Tibet employs a variety of methods to keep the ground cool, both in areas with frost-susceptible soil. Permafrost may necessitate special enclosures for buried utilities, called "utilidors".^[66]

The Melnikov Permafrost Institute in Yakutsk, found that the sinking of large buildings into the ground can be prevented by using pile foundations extending down to 15 metres (49 ft) or more. At this depth the temperature does not change with the seasons, remaining at about −5 °C (23 °F).^[67]

Yakutsk is one of two large cities in the world built in areas of continuous permafrost—that is, where the frozen soil forms an unbroken, below-zero sheet. The other is Norilsk, in Krasnoyarsk Krai, Russia.^[63]

Modern buildings in permafrost zones may be built on piles to avoid permafrost-thaw foundation failure from the heat of the building.
Heat pipes in vertical supports maintain a frozen bulb around portions of the Trans-Alaska Pipeline that are at risk of thawing.
Pile foundations in Yakutsk, a city underlain with continuous permafrost.
District heating pipes run above ground in Yakutsk to avoid thawing permafrost.

Impacts of climate change

Globally, permafrost warmed by about 0.3 °C between 2007 and 2016, with stronger warming observed in the continuous permafrost zone relative to the discontinuous zone. This inevitably causes permafrost to thaw. Permafrost extent has been diminishing for decades, and more decline is expected in the future.^[8]^: 1280 This causes a wide range of issues, and International Permafrost Association (IPA) exists to help address them. It convenes International Permafrost Conferences and maintains Global Terrestrial Network for Permafrost, which undertakes special projects such as preparing databases, maps, bibliographies, and glossaries, and coordinates international field programmes and networks.^[68]

Thaw-induced soil instability

As the water drains or evaporates, soil structure weakens and sometimes becomes viscous until it regains strength with decreasing moisture content. One visible sign of permafrost degradation is the random displacement of trees from their vertical orientation in permafrost areas.^[69] Global warming has been increasing permafrost slope disturbances and sediment supplies to fluvial systems, resulting in exceptional increases in river sediment. ^[70] On the other hands, disturbance of formerly hard soil increases drainage of water reservoirs in northern wetlands. This can dry them out and compromise the survival of plants and animals used to the wetland ecosystem.^[71]

In high mountains, permafrost thaw causes buildup of pore-water pressure and increases stress, which may lead to slope failure and rockfalls.^[72]^[73] Over the past century, an increasing number of alpine rock slope failure events in mountain ranges around the world have been recorded, and some have been attributed to permafrost thaw induced by climate change. The 1987 Val Pola landslide that killed 22 people in the Italian Alps is considered one such example.^[74] In mountain ranges, much of the structural stability can be attributed to glaciers and permafrost. As climate warms, permafrost thaws, which results in a less stable mountain structure, and ultimately more slope failures.^[75]

In 2002, massive rock and ice falls (up to 11.8 million m³), earthquakes (up to 3.9 Richter), floods (up to 7.8 million m³ water), and rapid rock-ice flow to long distances (up to 7.5 km at 60 m/s) were attributed to slope instability in high mountain permafrost.^[76] Permafrost thaw can also result in the formation of frozen debris lobes (FDLs), which are defined as "slow-moving landslides composed of soil, rocks, trees, and ice".^[77] This is a notable issue in the Alaska's southern Brooks Range, where some FDLs measured over 100 m (110 yd) in width, 20 m (22 yd) in height, and 1,000 m (1,100 yd) in length by 2012.^[78]^[79] As of December 2021, there were 43 frozen debris lobes identified in the southern Brooks Range, where they could potentially threaten both the Trans Alaska Pipeline System (TAPS) corridor and the Dalton Highway, which is the main transport link between the Interior Alaska and the Alaska North Slope.^[80]

Infrastructure

A wide range of infrastructure in permafrost areas is threatened by the thaw.^[9]^[81]^: 236 In May 2020, thawing permafrost at Norilsk-Taimyr Energy's Thermal Power Plant No. 3 caused an oil storage tank to collapse, spilling 6,000 tonnes of diesel into the land, 15,000 into the water. The rivers Ambarnaya, Daldykan and many smaller rivers were polluted. The pollution reached the lake Pyasino that is important to the water supply of the entire Taimyr Peninsula. State of emergency at the federal level was declared. Many buildings and infrastructure are built on permafrost, which cover 65% of Russian territory, and all those can be damaged as it thaws. ^[82]^[83] The 2020 Norilsk oil spill has been described as the second-largest oil spill in modern Russian history.^[84] The thawing can also cause leakage of toxic elements from sites of buried toxic waste.^[84]^[85]

It's been estimated that nearly 70% of infrastructure located in the permafrost areas is at risk by 2050, while the associated costs could rise to tens of billions of dollars in the second half of the century. ^[10]

Climate change feedback

In the northern circumpolar region, permafrost contains 1700 billion tons of organic material equaling almost half of all organic material in all soils.^[87]^[88] This pool was built up over thousands of years and is only slowly degraded under the cold conditions in the Arctic. The amount of carbon sequestered in permafrost is four times the carbon that has been released to the atmosphere due to human activities in modern time.^[89] One manifestation of this is yedoma, which is an organic-rich (about 2% carbon by mass) Pleistocene-age loess permafrost with ice content of 50–90% by volume.^[90] Thawing can also influence the rate of change of soil gases with the atmosphere.^[91]^[71]

Carbon is continually cycling between soils, vegetation, and the atmosphere. As climate change increases mean annual air temperatures throughout the Arctic, it extends permafrost thaw and deepens the active layer, exposing old carbon that has been in storage for decades to millennia to biogenic processes which facilitate its entrance into the atmosphere. In general, the volume of permafrost in the upper 3 m of ground is expected to decrease by about 25% per 1 °C (1.8 °F)of global warming.^[92]^: 1283 According to the IPCC Sixth Assessment Report, there is high confidence that global warming over the last few decades has led to widespread increases in permafrost temperature.^[92]^: 1237 Observed warming was up to 3 °C (5.4 °F) in parts of Northern Alaska (early 1980s to mid-2000s) and up to 2 °C (3.6 °F) in parts of the Russian European North (1970–2020), and active layer thickness has increased in the European and Russian Arctic across the 21st century and at high elevation areas in Europe and Asia since the 1990s.^[92]^: 1237 In Yukon, the zone of continuous permafrost might have moved 100 kilometres (62 mi) poleward since 1899, but accurate records only go back 30 years. Based on high agreement across model projections, fundamental process understanding, and paleoclimate evidence, it is virtually certain that permafrost extent and volume will continue to shrink as global climate warms.^[92]^: 1283

Carbon emissions from permafrost thaw contribute to the same warming which facilitates the thaw, making it a positive climate change feedback. The warming also intensifies Arctic water cycle, and the increased amounts of warmer rain are another factor which increases permafrost thaw depths.^[93] The amount of carbon that will be released from warming conditions depends on depth of thaw, carbon content within the thawed soil, physical changes to the environment^[94] and microbial and vegetation activity in the soil. Microbial respiration is the primary process through which old permafrost carbon is re-activated and enters the atmosphere. The rate of microbial decomposition within organic soils, including thawed permafrost, depends on environmental controls, such as soil temperature, moisture availability, nutrient availability, and oxygen availability.^[95] In particular, sufficient concentrations of iron oxides in some permafrost soils can inhibit microbial respiration and prevent carbon mobilization: however, this protection only lasts until carbon is separated from the iron oxides by Fe-reducing bacteria, which is only a matter of time under the typical conditions.^[96] Depending on the soil type, Iron(III) oxide can boost oxidation of methane to carbon dioxide in the soil, but it can also amplify methane production by acetotrophs: these soil processes are not yet fully understood.^[97]

Altogether, the likelihood of the entire carbon pool mobilizing and entering the atmosphere is low despite the large volumes stored in the soil. Although temperatures will increase, this does not imply complete loss of permafrost and mobilization of the entire carbon pool. Much of the ground underlain by permafrost will remain frozen even if warming temperatures increase the thaw depth or increase thermokarsting and permafrost degradation.^[98] Moreover, other elements such as iron and aluminum can adsorb some of the mobilized soil carbon before it reaches the atmosphere, and they are particularly prominent in the mineral sand layers which often overlay permafrost.^[99] On the other hand, once the permafrost area thaws, it will not go back to being permafrost for centuries even if the temperature increase reversed, making it one of the best-known examples of tipping points in the climate system.

In 2011, preliminary computer analyses suggested that permafrost emissions could be equivalent to around 15% of anthropogenic emissions.^[100]

A 2018 perspectives article discussing tipping points in the climate system activated around 2 °C (3.6 °F) of global warming suggested that at this threshold, permafrost thaw would add a further 0.09 °C (0.16 °F) to global temperatures by 2100, with a range of 0.04–0.16 °C (0.072–0.288 °F)^[101] In 2021, another study estimated that in a future where zero emissions were reached following an emission of a further 1000 Pg C into the atmosphere (a scenario where temperatures ordinarily stay stable after the last emission, or start to decline slowly) permafrost carbon would add 0.06 °C (0.11 °F) (with a range of 0.02–0.14 °C (0.036–0.252 °F)) 50 years after the last anthropogenic emission, 0.09 °C (0.16 °F) (0.04–0.21 °C (0.072–0.378 °F)) 100 years later and 0.27 °C (0.49 °F) (0.12–0.49 °C (0.22–0.88 °F)) 500 years later.^[102] However, neither study was able to take abrupt thaw into account.

In 2020, a study of the northern permafrost peatlands (a smaller subset of the entire permafrost area, covering 3.7 million km² out of the estimated 18 million km²^[103]) would amount to ~1% of anthropogenic radiative forcing by 2100, and that this proportion remains the same in all warming scenarios considered, from 1.5 °C (2.7 °F) to 6 °C (11 °F). It had further suggested that after 200 more years, those peatlands would have absorbed more carbon than what they had emitted into the atmosphere.^[104]

The IPCC Sixth Assessment Report estimates that carbon dioxide and methane released from permafrost could amount to the equivalent of 14–175 billion tonnes of carbon dioxide per 1 °C (1.8 °F) of warming.^[92]^: 1237 For comparison, by 2019, annual anthropogenic emission of carbon dioxide alone stood around 40 billion tonnes.^[92]^: 1237

A 2021 assessment of the economic impact of climate tipping points estimated that permafrost carbon emissions would increase the social cost of carbon by about 8.4% ^[106] However, the methods of that assessment have attracted controversy: when researchers like Steve Keen and Timothy Lenton had accused it of underestimating the overall impact of tipping points and of higher levels of warming in general,^[107] the authors have conceded some of their points.^[108]

In 2021, a group of prominent permafrost researchers like Merritt Turetsky had presented their collective estimate of permafrost emissions, including the abrupt thaw processes, as part of an effort to advocate for a 50% reduction in anthropogenic emissions by 2030 as a necessary milestone to help reach net zero by 2050. Their figures for combined permafrost emissions by 2100 amounted to 150–200 billion tonnes of carbon dioxide equivalent under 1.5 °C (2.7 °F) of warming, 220–300 billion tonnes under 2 °C (3.6 °F) and 400–500 billion tonnes if the warming was allowed to exceed 4 °C (7.2 °F). They compared those figures to the extrapolated present-day emissions of Canada, the European Union and the United States or China, respectively. The 400–500 billion tonnes figure would also be equivalent to the today's remaining budget for staying within a 1.5 °C (2.7 °F) target.^[109] One of the scientists involved in that effort, Susan M. Natali of Woods Hole Research Centre, had also led the publication of a complementary estimate in a PNAS paper that year, which suggested that when the amplification of permafrost emissions by abrupt thaw and wildfires is combined with the foreseeable range of near-future anthropogenic emissions, avoiding the exceedance (or "overshoot") of 1.5 °C (2.7 °F) warming is already implausible, and the efforts to attain it may have to rely on negative emissions to force the temperature back down.^[110]

An updated 2022 assessment of climate tipping points concluded that abrupt permafrost thaw would add 50% to gradual thaw rates, and would add 14 billion tons of carbon dioxide equivalent emissions by 2100 and 35 billion tons by 2300 per every degree of warming. This would have a warming impact of 0.04 °C (0.072 °F) per every full degree of warming by 2100, and 0.11 °C (0.20 °F) per every full degree of warming by 2300. It also suggested that at between 3 °C (5.4 °F) and 6 °C (11 °F) degrees of warming (with the most likely figure around 4 °C (7.2 °F) degrees) a large-scale collapse of permafrost areas could become irreversible, adding between 175 and 350 billion tons of CO₂ equivalent emissions, or 0.2–0.4 °C (0.36–0.72 °F) degrees, over about 50 years (with a range between 10 and 300 years).^[111]^[112]

A major review published in the year 2022 concluded that if the goal of preventing 2 °C (3.6 °F) of warming was realized, then the average annual permafrost emissions throughout the 21st century would be equivalent to the year 2019 annual emissions of Russia. Under RCP4.5, a scenario considered close to the current trajectory and where the warming stays slightly below 3 °C (5.4 °F), annual permafrost emissions would be comparable to year 2019 emissions of Western Europe or the United States, while under the scenario of high global warming and worst-case permafrost feedback response, they would nearly match year 2019 emissions of China.^[105]

Revival of preserved microorganisms

The number of bacteria in permafrost soil varies widely, typically from 1 to 1000 million per gram of soil.^[113] Most of these bacteria and fungi in permafrost soil cannot be cultured in the laboratory, but the identity of the microorganisms can be revealed by DNA-based techniques. Scientists predict that up to 10²¹ microbes, including fungi and bacteria in addition to viruses, will be released from melting ice per year. Often, these microbes will be released directly into the ocean. Due to the migratory nature of many species of fish and birds, it is possible that these microbes have a high transmission rate.^[12]

Permafrost in eastern Switzerland was analyzed by researchers in 2016 at an alpine permafrost site called “Muot-da-Barba-Peider”.This site had a diverse microbial community with various bacteria and eukaryotic groups present. Prominent bacteria groups included phylum Acidobacteriota, Actinomycetota, AD3, Bacteroidota, Chloroflexota, Gemmatimonadota, OD1, Nitrospirota, Planctomycetota, Pseudomonadota, and Verrucomicrobiota. Prominent eukaryotic fungi included Ascomycota, Basidiomycota, and Zygomycota. In the present species, scientists observed a variety of adaptations for sub-zero conditions, including reduced and anaerobic metabolic processes.^[114]

A 2016 outbreak of anthrax in the Yamal Peninsula is believed to be due to thawing permafrost.^[115] Also present in Siberian permafrost are two species of virus: Pithovirus sibericum^[116] and Mollivirus sibericum.^[11] Both of these are approximately 30,000 years old and considered giant viruses due to the fact that they are larger in size than most bacteria and have genomes larger than other viruses. Both viruses are still infective, as seen by their ability to infect Acanthamoeba, a genus of amoebas.^[11]

Freezing at low temperatures has been shown to preserve the infectivity of viruses. Caliciviruses, influenza A, and enteroviruses (ex. Polioviruses, echoviruses, Coxsackie viruses) have all been preserved in ice and/or permafrost. Scientists have determined three characteristics necessary for a virus to successfully preserve in ice: high abundance, ability to transport in ice, and ability to resume disease cycles upon being released from ice. A direct infection from permafrost or ice to humans has not been demonstrated; such viruses are typically spread through other organisms or abiotic mechanisms.^[12]

A study of late Pleistocene Siberian permafrost samples from Kolyma Lowland (an east siberian lowland) used DNA isolation and gene cloning (specifically 16S rRNA genes) to determine which phyla these microorganisms belonged to. This technique allowed a comparison of known microorganisms to their newly discovered samples and revealed eight phylotypes, which belonged to the phyla Actinomycetota and Pseudomonadota.^[117]

Preservation of plants

In 2012, Russian researchers proved that permafrost can serve as a natural repository for ancient life forms by reviving of Silene stenophylla from 30,000 year old tissue found in an Ice Age squirrel burrow in the Siberian permafrost. This is the oldest plant tissue ever revived. The plant was fertile, producing white flowers and viable seeds. The study demonstrated that tissue can survive ice preservation for tens of thousands of years.^[118]

Extraterrestrial permafrost

Permafrost polygons on Mars imaged by the Phoenix lander.
False-color Mars Reconnaissance Orbiter image of polygonal surface pattern.

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External links

Permafrostwatch University of Alaska Fairbanks
Infographics about permafrost
International Permafrost Association (IPA)
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@@ Line 16: / Line 16: @@
 }}
 [[File:Permafrost - ice wedge.jpg|thumb|right|Slope failure of permafrost soil, revealing the top of an [[ice wedge]].]]
+'''Permafrost''' is [[soil]] or underwater [[sediment]] which continuously remains below {{convert|0|C-change|F-change}} for two or more years. Land-based permafrost can include the surface layer of the soil, but if the surface is too warm, it may still occur within a few centimeters of the surface down to hundreds of meters. It usually consists of [[ice]] holding in place a combination of various types of soil, [[sand]], and [[rock (geology)|rock]], though in ice-free ground, perennially frozen non-porous [[bedrock]] can serve the same role.<ref name=":1">{{Cite web|url=https://climatekids.nasa.gov/permafrost/|title=What Is Permafrost?|last=Doyle|first=Heather|date=April 9, 2020|website=NASA Climate Kids }}</ref>
-'''Permafrost''' is ground that continuously remains below 0&nbsp;°C (32&nbsp;°F) for two or more years, located on land or under the [[ocean]]. Most common in the Northern Hemisphere, around 15% of the [[Northern Hemisphere]] or 11% of the global surface is underlain by permafrost,<ref name="Obu 2021 e2021JF006123">{{Cite journal|last=Obu|first=J.|date=2021|title=How Much of the Earth's Surface is Underlain by Permafrost?|journal=Journal of Geophysical Research: Earth Surface |volume=126|issue=5|pages=e2021JF006123|doi=10.1029/2021JF006123|bibcode=2021JGRF..12606123O |doi-access=free}}</ref> with the total area of around 18 million km<sup>2</sup>.<ref name=":4">{{Cite journal|last1=Sayedi|first1=Sayedeh Sara|last2=Abbott|first2=Benjamin W|last3=Thornton|first3=Brett F|last4=Frederick|first4=Jennifer M|last5=Vonk|first5=Jorien E|last6=Overduin|first6=Paul|last7=Schädel|first7=Christina|last8=Schuur|first8=Edward A G|last9=Bourbonnais|first9=Annie|last10=Demidov|first10=Nikita|last11=Gavrilov|first11=Anatoly|date=2020-12-01|title=Subsea permafrost carbon stocks and climate change sensitivity estimated by expert assessment |journal=Environmental Research Letters|volume=15|issue=12|pages=B027-08|doi=10.1088/1748-9326/abcc29|bibcode=2020AGUFMB027...08S|s2cid=234515282 |doi-access=free}}</ref> This includes substantial areas of [[Alaska]], [[Greenland]], [[Canada]] and [[Siberia]]. It is also located in high mountain regions, with the [[Qinghai–Tibet Plateau]] a prominent example. Most of the permafrost exists in the [[Northern Hemisphere]], although some is known to exist in the [[Southern Hemisphere]], where it is consigned to mountain slopes like in the [[Andes]] or the [[Southern Alps]] of [[New Zealand]], and beneath the massive [[ice sheet]]s of the [[Antarctic]].<ref name="NRDC">{{Cite web|url=https://www.nrdc.org/stories/permafrost-everything-you-need-know|last=Denchak|first=Melissa |title=Permafrost: Everything You Need to Know |date=June 26, 2018|website=NRDC}}</ref>
+Around 15% of the [[Northern Hemisphere]] or 11% of the global surface is underlain by permafrost,<ref name="Obu 2021 e2021JF006123">{{Cite journal|last=Obu|first=J.|date=2021|title=How Much of the Earth's Surface is Underlain by Permafrost?|journal=Journal of Geophysical Research: Earth Surface |volume=126|issue=5|pages=e2021JF006123|doi=10.1029/2021JF006123|bibcode=2021JGRF..12606123O |doi-access=free}}</ref> with the total area of around 18 million km<sup>2</sup>.<ref name=":4">{{Cite journal|last1=Sayedi|first1=Sayedeh Sara|last2=Abbott|first2=Benjamin W|last3=Thornton|first3=Brett F|last4=Frederick|first4=Jennifer M|last5=Vonk|first5=Jorien E|last6=Overduin|first6=Paul|last7=Schädel|first7=Christina|last8=Schuur|first8=Edward A G|last9=Bourbonnais|first9=Annie|last10=Demidov|first10=Nikita|last11=Gavrilov|first11=Anatoly|date=2020-12-01|title=Subsea permafrost carbon stocks and climate change sensitivity estimated by expert assessment |journal=Environmental Research Letters|volume=15|issue=12|pages=B027-08|doi=10.1088/1748-9326/abcc29|bibcode=2020AGUFMB027...08S|s2cid=234515282 |doi-access=free}}</ref> This includes substantial areas of [[Alaska]], [[Greenland]], [[Canada]] and [[Siberia]]. It is also located in high mountain regions, with the [[Qinghai–Tibet Plateau]] a prominent example. Only a minority of permafrost exists in the [[Southern Hemisphere]], where it is consigned to mountain slopes like in the [[Andes]] or the [[Southern Alps]] of [[New Zealand]], and beneath the massive [[ice sheet]]s of the [[Antarctic]].<ref name="NRDC">{{Cite web|url=https://www.nrdc.org/stories/permafrost-everything-you-need-know|last=Denchak|first=Melissa |title=Permafrost: Everything You Need to Know |date=June 26, 2018|website=NRDC}}</ref>
-In areas underlain by permafrost where the surface temperatures fluctuate annually above and below the freezing point, stable frozen temperatures may occur within a few centimeters of the surface down to hundreds of meters. It may be manifest as persistent ground ice or perennially frozen non-porous bedrock. Permafrost often comprises ice holding various types of soil, sand, and rock in combination.<ref name=":1">{{Cite web|url=https://climatekids.nasa.gov/permafrost/|title=What Is Permafrost?|last=Doyle|first=Heather|date=April 9, 2020|website=NASA Climate Kids }}</ref>
-Permafrost contains large amounts of dead [[biomass]] which had accumulated throughout millennia without having had the chance to fully decompose and release its [[carbon]], making tundra soil a [[carbon sink]].<ref name="NRDC" /> As [[Climate change|global warming]] heats the ecosystem, frozen soil thaws and becomes warm enough for decomposition to start anew, accelerating [[permafrost carbon cycle]] in one of the [[effects of climate change]]. Depending on conditions at the time of thaw, decomposition can either release [[carbon dioxide]] or [[methane]], and these [[greenhouse gas emissions]] act as a [[climate change feedback]].<ref name="NOAA">{{Cite web|url=https://arctic.noaa.gov/Report-Card/Report-Card-2019/ArtMID/7916/ArticleID/844/Permafrost-and-the-Global-Carbon-Cycle|last=Schuur|first=T. |title=Permafrost and the Global Carbon Cycle |date=November 22, 2019|website=NRDC}}</ref><ref>{{cite journal |last1=Koven |first1=Charles D. |last2=Ringeval |first2=Bruno |last3=Friedlingstein |first3=Pierre |last4=Ciais |first4=Philippe |last5=Cadule |first5=Patricia |last6=Khvorostyanov |first6=Dmitry |last7=Krinner |first7=Gerhard |last8=Tarnocai |first8=Charles |title=Permafrost carbon-climate feedbacks accelerate global warming |journal=Proceedings of the National Academy of Sciences |date=6 September 2011 |volume=108 |issue=36 |pages=14769–14774 |doi=10.1073/pnas.1103910108 |pmid=21852573 |pmc=3169129 |bibcode=2011PNAS..10814769K |doi-access=free }}</ref><ref>{{Cite journal |last1=Galera |first1=L. A. |last2=Eckhardt |first2=T. |last3=Beer C. |first3=Pfeiffer E.-M. |last4=Knoblauch |first4=C. |date=22 March 2023 |title=Ratio of in situ CO2 to CH4 production and its environmental controls in polygonal tundra soils of Samoylov Island, Northeastern Siberia |journal=Journal of Geophysical Research: Biogeosciences |volume=128 |page=e2022JG006956 |doi=10.1029/2022JG006956}}</ref>
+Permafrost contains large amounts of dead [[biomass]] which had accumulated throughout millennia without having had the chance to fully decompose and release its [[carbon]], making tundra soil a [[carbon sink]].<ref name="NRDC" /> As [[Climate change|global warming]] heats the ecosystem, frozen soil thaws and becomes warm enough for decomposition to start anew, accelerating [[permafrost carbon cycle]] in one of the [[effects of climate change]]. Depending on conditions at the time of thaw, decomposition can either release [[carbon dioxide]] or [[methane]], and these [[greenhouse gas emissions]] act as a [[climate change feedback]].<ref name="NOAA">{{Cite web|url=https://arctic.noaa.gov/Report-Card/Report-Card-2019/ArtMID/7916/ArticleID/844/Permafrost-and-the-Global-Carbon-Cycle|last=Schuur|first=T. |title=Permafrost and the Global Carbon Cycle |date=November 22, 2019|website=NRDC}}</ref><ref>{{cite journal |last1=Koven |first1=Charles D. |last2=Ringeval |first2=Bruno |last3=Friedlingstein |first3=Pierre |last4=Ciais |first4=Philippe |last5=Cadule |first5=Patricia |last6=Khvorostyanov |first6=Dmitry |last7=Krinner |first7=Gerhard |last8=Tarnocai |first8=Charles |title=Permafrost carbon-climate feedbacks accelerate global warming |journal=Proceedings of the National Academy of Sciences |date=6 September 2011 |volume=108 |issue=36 |pages=14769–14774 |doi=10.1073/pnas.1103910108 |pmid=21852573 |pmc=3169129 |bibcode=2011PNAS..10814769K |doi-access=free }}</ref><ref>{{Cite journal |last1=Galera |first1=L. A. |last2=Eckhardt |first2=T. |last3=Beer C. |first3=Pfeiffer E.-M. |last4=Knoblauch |first4=C. |date=22 March 2023 |title=Ratio of in situ CO2 to CH4 production and its environmental controls in polygonal tundra soils of Samoylov Island, Northeastern Siberia |journal=Journal of Geophysical Research: Biogeosciences |volume=128 |page=e2022JG006956 |doi=10.1029/2022JG006956}}</ref>The emissions from thawing permafrost will have a sufficient impact on the climate to impact global [[carbon budget]]s. Exact estimates of permafrost emissions are hard to model because of the uncertainty about different thaw processes, but there's a widespread agreement they'll be smaller than anthropogenic emissions and not large enough to result in [[runaway greenhouse effect|"runaway warming"]].<ref name="AR6_WG1_Chapter92">Fox-Kemper, B., H.T. Hewitt, C. Xiao, G. Aðalgeirsdóttir, S.S. Drijfhout, T.L. Edwards, N.R. Golledge, M. Hemer, R.E. Kopp, G.  Krinner, A. Mix, D. Notz, S. Nowicki, I.S. Nurhati, L. Ruiz, J.-B. Sallée, A.B.A. Slangen, and Y. Yu, 2021: [https://www.ipcc.ch/report/ar6/wg1/downloads/report/IPCC_AR6_WGI_Chapter09.pdf Chapter 9: Ocean, Cryosphere and Sea Level Change]. In [https://www.ipcc.ch/report/ar6/wg1/ Climate Change 2021: The Physical Science Basis. Contribution of Working Group I to the Sixth Assessment Report of the Intergovernmental Panel on Climate Change] [Masson-Delmotte, V., P. Zhai, A. Pirani, S.L.  Connors, C. Péan, S. Berger, N. Caud, Y. Chen, L. Goldfarb, M.I. Gomis, M. Huang, K. Leitzell, E. Lonnoy, J.B.R. Matthews, T.K. Maycock, T. Waterfield, O. Yelekçi, R. Yu, and B. Zhou (eds.)]. Cambridge University Press, Cambridge, United Kingdom and New York, NY, USA, pp. 1211–1362.</ref>
+In addition to its climate impact, permafrost thaw also brings additional risks. Formerly frozen ground often contains enough ice that when it thaws, [[Phreatic zone|hydraulic saturation]] is suddenly exceeded, so the ground shifts substantially and may even collapse outright. Many buildings and other [[infrastructure]] were built on permafrost when it was frozen and stable, and are also vulnerable to collapse if it thaws.<ref name="Nelson2022" /> Estimates suggest nearly 70% of such infrastructure is at risk by 2050, and that the associated costs could rise to tens of billions of dollars in the second half of the century.<ref name="Hjort2022" /> Additionally, there are [[toxic waste]] dumps in the permafrost, as well as the natural [[mercury (element)|mercury]] deposits, which are liable to leak and pollute the environment as the warming progresses. Lastly, there have been concerns about potentially [[pathogenic]] microorganisms surviving the thaw and contributing to future [[epidemic]]s and [[pandemic]]s, although this risk is more speculative than the others.<ref name="Legendre 2015 E5327–E5335"/><ref name=":0" />
-The emissions from thawing permafrost will have a sufficient impact on the climate to impact global [[carbon budget]]s. Exact estimates of permafrost emissions are hard to model because of the uncertainty about different thaw processes, but there's a widespread agreement they'll be smaller than anthropogenic emissions and not large enough to result in "runaway warming".<ref name="AR6_WG1_Chapter92">Fox-Kemper, B., H.T. Hewitt, C. Xiao, G. Aðalgeirsdóttir, S.S. Drijfhout, T.L. Edwards, N.R. Golledge, M. Hemer, R.E. Kopp, G.  Krinner, A. Mix, D. Notz, S. Nowicki, I.S. Nurhati, L. Ruiz, J.-B. Sallée, A.B.A. Slangen, and Y. Yu, 2021: [https://www.ipcc.ch/report/ar6/wg1/downloads/report/IPCC_AR6_WGI_Chapter09.pdf Chapter 9: Ocean, Cryosphere and Sea Level Change]. In [https://www.ipcc.ch/report/ar6/wg1/ Climate Change 2021: The Physical Science Basis. Contribution of Working Group I to the Sixth Assessment Report of the Intergovernmental Panel on Climate Change] [Masson-Delmotte, V., P. Zhai, A. Pirani, S.L.  Connors, C. Péan, S. Berger, N. Caud, Y. Chen, L. Goldfarb, M.I. Gomis, M. Huang, K. Leitzell, E. Lonnoy, J.B.R. Matthews, T.K. Maycock, T. Waterfield, O. Yelekçi, R. Yu, and B. Zhou (eds.)]. Cambridge University Press, Cambridge, United Kingdom and New York, NY, USA, pp. 1211–1362.</ref> Permafrost thaw also risks the collapse of buildings and other [[infrastructure]] which were built on it when it was stable, with estimates suggesting that nearly 70% of such infrastructure is at risk by 2050, and that the associated costs could rise to tens of billions of dollars in the second half of the century.<ref name="Hjort2022" />
 {{TOC limit|3}}
 ==Study of permafrost==
-[[File:K.E.vonBaer 1840 03.jpg|thumb|Southern limit of permafrost in [[Eurasia]] according to Karl Ernst von Baer (1843), and other authors.]]
+[[File:K.E.vonBaer 1840 03.jpg|thumb|left|Southern limit of permafrost in [[Eurasia]] according to Karl Ernst von Baer (1843), and other authors.]]
-In contrast to the relative dearth of reports on frozen ground in [[North America]] prior to World War II, a vast literature on basic permafrost science and the engineering aspects of permafrost was available in Russian. Some Russian authors relate permafrost research with the name [[Alexander von Middendorff]] (1815–1894). However, Russian scientists also realized, that [[Karl Ernst von Baer]] must be given the attribute "founder of scientific permafrost research". In 1843, Baer's original study “materials for the study of the perennial ground-ice” was ready to be printed. Baer's detailed study consists of 218 pages and was written in German language, as he was a Baltic German scientist. He was teaching at the  [[University of Königsberg]] and became a member of the [[St Petersburg Academy of Sciences]]. This world's first permafrost textbook was conceived as a complete work and ready for printing in 1843. But it remained lost for around 150 years. However, from 1838 onwards, Baer published several individual publications on permafrost. The [[Russian Academy of Sciences]] honoured Baer with the publication of a tentative Russian translation of his study in 1942.<ref name="King-edt" />
+In contrast to the relative dearth of reports on frozen ground in [[North America]] prior to World War II, a vast literature on basic permafrost science and the engineering aspects of permafrost was available in [[Russian language|Russian]]. Some Russian authors relate permafrost research with the name [[Alexander von Middendorff]] (1815–1894). However, Russian scientists also realized, that [[Karl Ernst von Baer]] must be given the attribute "founder of scientific permafrost research". In 1843, Baer's original study “materials for the study of the perennial ground-ice” was ready to be printed. Baer's detailed study consists of 218 pages and was written in German language, as he was a Baltic German scientist. He was teaching at the  [[University of Königsberg]] and became a member of the [[St Petersburg Academy of Sciences]]. This world's first permafrost textbook was conceived as a complete work and ready for printing in 1843. But it remained lost for around 150 years. However, from 1838 onwards, Baer published several individual publications on permafrost. The [[Russian Academy of Sciences]] honoured Baer with the publication of a tentative Russian translation of his study in 1942.<ref name="King-edt" />
 These facts were completely forgotten after the [[Second World War]]. Thus in 2001 the discovery of the typescript from 1843 in the library [[archive]]s of the [[University of Giessen]] and its annotated publication was a scientific sensation. The full text of Baer's original work is available online (234 pages).<ref name="King-edt">{{cite journal|last1=King|first1=Lorenz|date=2001|title=Materialien zur Kenntniss des unvergänglichen Boden-Eises in Sibirien, compiled by Baer in 1843|url=http://geb.uni-giessen.de/geb/volltexte/2006/3649/pdf/BaerMaterialien-2001.pdf|language=german|journal=Berichte und Arbeiten aus der Universitätsbibliothek und dem Universitätsarchiv Giessen|volume=51|pages=1–315|access-date=2021-07-27}}</ref> The editor added to the [[facsimile]] reprint a preface in English, two colour permafrost maps of Eurasia and some figures of permafrost features. Baer's text is introduced with detailed comments and references on additional 66 pages written by the [[Estonians|Estonian]] historian Erki Tammiksaar. The work is notable because Baer's observations on permafrost distribution and periglacial morphological descriptions are seen as largely correct to the present day.<ref name="King-edt" /> With his compilation and analysis of all available data on ground ice and permafrost, Baer laid the foundation for the modern permafrost terminology. Baer's southern limit of permafrost in [[Eurasia]] drawn in 1843 corresponds well with the actual southern limit on the ''Circum-Arctic Map of Permafrost and Ground Ice Conditions'' of the [[International Permafrost Association]] (edited by J. Brown et al.).<ref name="Hegginbot"/>
@@ Line 259: / Line 259: @@
  | chapter-url = https://archive.org/details/encyclopediaofoc0000unse
  }}</ref> It also contains gas hydrates in places, which are a "potential abundant source of energy" but may also destabilize as subsea permafrost warms and thaws, producing large amounts of methane gas, which is a potent greenhouse gas.<ref name=Osterkamp/><ref>{{cite web|authors=IPCC AR4|title=Climate Change 2007: Working Group I: The Physical Science Basis|date=2007|url=http://www.ipcc.ch/publications_and_data/ar4/wg1/en/ch4s4-7-2-4.html|access-date=April 12, 2014|archive-url=https://web.archive.org/web/20140413125748/http://www.ipcc.ch/publications_and_data/ar4/wg1/en/ch4s4-7-2-4.html|archive-date=April 13, 2014|url-status=dead}}</ref><ref>{{Cite journal|last1=Sayedi|first1=Sayedeh Sara|last2=Abbott|first2=Benjamin W|last3=Thornton|first3=Brett F|last4=Frederick|first4=Jennifer M|last5=Vonk|first5=Jorien E|last6=Overduin|first6=Paul|last7=Schädel|first7=Christina|last8=Schuur|first8=Edward A G|last9=Bourbonnais|first9=Annie|last10=Demidov|first10=Nikita|last11=Gavrilov|first11=Anatoly|date=2020-12-01|title=Subsea permafrost carbon stocks and climate change sensitivity estimated by expert assessment|journal=Environmental Research Letters |volume=15|issue=12|pages=124075|doi=10.1088/1748-9326/abcc29|bibcode=2020AGUFMB027...08S |doi-access=free}}</ref> Scientists report with high confidence that the extent of subsea permafrost is decreasing, and 97% of permafrost under Arctic ice shelves is currently thinning.<ref>{{Cite journal |last1=Overduin |first1=P. P. |last2=Schneider von Deimling |first2=T. |last3=Miesner |first3=F. |last4=Grigoriev |first4=M. N. |last5=Ruppel |first5=C. |last6=Vasiliev |first6=A. |last7=Lantuit |first7=H. |last8=Juhls |first8=B. |last9=Westermann |first9=S. |date=June 2019 |title=Submarine Permafrost Map in the Arctic Modeled Using 1‐D Transient Heat Flux (SuPerMAP) |journal=Journal of Geophysical Research: Oceans |volume=124 |issue=6 |pages=3490–3507 |doi=10.1029/2018JC014675 |bibcode=2019JGRC..124.3490O |hdl=1912/24566 |s2cid=146331663 |url=https://epic.awi.de/id/eprint/49740/1/Overduin_etal2019_ePIC.pdf }}</ref><ref name="AR6_WG1_Chapter92" />{{rp|1281}}
+=== Past extent of permafrost ===
+At the [[Last Glacial Maximum]], continuous permafrost covered a much greater area than it does today, covering all of ice-free [[Europe]] south to about [[Szeged]] (southeastern Hungary) and the [[Sea of Azov]] (then dry land)<ref>Sidorchuk, Aleksey, Borisova Olga and Panin; Andrey; [http://www.fluvial-systems.net/present_en/global.pdf “Fluvial response to the late Valdai/Holocene environmental change on the East European plain”] {{Webarchive|url=https://web.archive.org/web/20131226230314/http://www.fluvial-systems.net/present_en/global.pdf |date=2013-12-26 }}</ref> and [[East Asia]] south to present-day [[Changchun]] and [[Abashiri, Hokkaidō|Abashiri]].<ref>Yugo Ono and Tomohisa Irino; “Southern migration of westerlies in the Northern Hemisphere PEP II transect during the Last Glacial Maximum” in ''Quaternary International'' 118–119 (2004); pp. 13–22</ref> In [[North America]], only an extremely narrow belt of permafrost existed south of the [[ice sheet]] at about the latitude of [[New Jersey]] through southern [[Iowa]] and northern [[Missouri]], but permafrost was more extensive in the drier western regions where it extended to the southern border of [[Idaho]] and [[Oregon]].<ref>Malde, H.E.; “Patterned Ground in the Western Snake River Plain, Idaho, and Its Possible Cold-Climate Origin”; in ''Geological society of America Bulletin''; v. 75 no. 3 (March 1964); pp. 191–208</ref> In the southern hemisphere, there is some evidence for former permafrost from this period in central [[Otago]] and [[Argentina|Argentine]] [[Patagonia]], but was probably discontinuous, and is related to the tundra. Alpine permafrost also occurred in the [[Drakensberg]] during glacial maxima above about {{convert|3000|m|ft|-1}}.<ref>Grab, Stefan; “Characteristics and palaeoenvironmental significance of relict sorted patterned ground, Drakensberg plateau, southern Africa” in ''Quaternary Science Reviews'', vol. 21, issues 14–15, (August 2002), pp. 1729–1744</ref><ref>"Inventory of fossil cryogenic forms and structures in Patagonia and the mountains of Argentina beyond the Andes". South African Journal of Science, 98: 171–180, Review Articles, Pretoria, Sudáfrica.</ref>
 == Manifestations ==
@@ Line 415: / Line 418: @@
 File:Permafrost pattern.jpg|Contraction crack ([[ice wedge]]) polygons on Arctic sediment.
 File:Storflaket.JPG|Cracks forming at the edges of the [[Storflaket]] permafrost bog in [[Sweden]].
 </gallery>
+===Ecology===
-===Carbon cycle in permafrost===
+Only plants with shallow roots can survive in the presence of permafrost. [[Black spruce]] tolerates limited rooting zones, and dominates [[flora]] where permafrost is extensive. Likewise, animal [[species]] which live in dens and [[burrow]]s have their habitat constrained by the permafrost, and these constraints also have a secondary impact on interactions between species within the [[ecosystem]].<ref>C. Michael Hogan, [http://globaltwitcher.auderis.se/artspec_information.asp?thingid=44751 ''Black Spruce: Picea mariana'', GlobalTwitcher.com, ed. Nicklas Stromberg, November, 2008] {{webarchive|url=https://web.archive.org/web/20111005174426/http://globaltwitcher.auderis.se/artspec_information.asp?thingid=44751 |date=2011-10-05 }}</ref>
 The [[permafrost carbon cycle]] (Arctic Carbon Cycle) deals with the transfer of carbon from permafrost soils to terrestrial vegetation and microbes, to the atmosphere, back to vegetation, and finally back to permafrost soils through burial and sedimentation due to cryogenic processes. Some of this carbon is transferred to the ocean and other portions of the globe through the global carbon cycle. The cycle includes the exchange of [[carbon dioxide]] and [[methane]] between terrestrial components and the atmosphere, as well as the transfer of carbon between land and water as methane, [[dissolved organic carbon]], [[dissolved inorganic carbon]], [[particulate inorganic carbon]] and [[particulate organic carbon]].<ref name=mcguire>{{Cite journal |doi=10.1890/08-2025.1 |author=McGuire, A.D., Anderson, L.G., Christensen, T.R., Dallimore, S., Guo, L., Hayes, D.J., Heimann, M., Lorenson, T.D., Macdonald, R.W., and Roulet, N. |title=Sensitivity of the carbon cycle in the Arctic to climate change |journal=Ecological Monographs |volume=79 |issue=4 |pages=523–555 |year=2009 |hdl=11858/00-001M-0000-000E-D87B-C |s2cid=1779296 |hdl-access=free }}</ref>
+===Construction on permafrost===
-==Effects of climate change ==
+Building on permafrost is difficult because the heat of the building (or [[pipeline transport|pipeline]]) can warm the permafrost and destabilize the structure. Warming can result in thawing of the soil and its consequent weakening of support for a structure as the ice content turns to water; alternatively, where structures are built on piles, warming can cause movement through [[Creep (deformation)|creep]] because of the change of friction on the piles even as the soil remains frozen.<ref>{{Cite book|last=Fang|first=Hsai-Yang|url=https://books.google.com/books?id=X8hEt3l1SPQC&q=foundations+on+permafrost&pg=PA735|title=Foundation Engineering Handbook|date=1990-12-31|publisher=Springer Science & Business Media|isbn=978-0-412-98891-2|page=735 }}</ref> Additionally, there is no ground water available in an area underlain with permafrost. Any substantial settlement or installation needs to make some alternative arrangement to obtain water.<ref name="NY11022" /> Three common solutions include: using [[foundation (architecture)|foundations]] on wood [[Deep foundation|piles]], a technique pioneered by Soviet engineer [[Mikhail Kim]] in Norilsk;<ref>{{Cite magazine|last=Yaffa|first=Joshua|date=2022-01-07|title=The Great Siberian Thaw|url=https://www.newyorker.com/magazine/2022/01/17/the-great-siberian-thaw|access-date=2022-01-12|magazine=The New Yorker }}</ref> building on a thick [[gravel]] pad (usually 1–2 metres/3.3–6.6 feet thick); or using [[anhydrous ammonia]] [[heat pipe]]s.<ref name="ASCE">{{cite book| last = Clarke| first = Edwin S.| title = Permafrost Foundations—State of the Practice| work = Monograph Series| publisher = American Society of Civil Engineers | date = 2007 | url = https://books.google.com/books?id=O-voTug5apsC&pg=PA34| isbn = 978-0-7844-0947-3}}</ref> The [[Trans-Alaska Pipeline System]] uses [[Heat pipe#Permafrost cooling|heat pipes built into vertical supports]] to prevent the pipeline from sinking and the [[Qingzang railway]] in [[Tibet]] employs a variety of methods to keep the ground cool, both in areas with [[Frost heaving#Frost-susceptible soils|frost-susceptible soil]]. Permafrost may necessitate special enclosures for buried utilities, called "[[Utility tunnel#In Arctic towns|utilidors]]".<ref>{{Cite book|last=Woods|first=Kenneth B.|url=https://books.google.com/books?id=3jErAAAAYAAJ&q=utilidors+in+permafrost&pg=PA441|title=Permafrost International Conference: Proceedings|date=1966|publisher=National Academies|pages=418–57 }}</ref>
-{{Further|Permafrost carbon cycle}}
-<!-- this first paragraph is also transcribed to [[effects of climate change]] -->
-Arctic permafrost has been diminishing for decades. Globally, permafrost warmed by about {{val|0.3|u=degC}} between 2007 and 2016, with stronger warming observed in the continuous permafrost zone relative to the discontinuous zone.<ref name="AR6_WG1_Chapter92" />{{rp|1280}} The consequence is thawing soil, which may be weaker, and release of methane, which contributes to an increased rate of [[global warming]] as part of a [[climate change feedback|feedback loop]] caused by microbial decomposition.<ref name="Koven 1877–1900">{{Cite journal|last1=Koven|first1=Charles D.|last2=Riley|first2=William J.|last3=Stern|first3=Alex|date=2012-10-01|title=Analysis of Permafrost Thermal Dynamics and Response to Climate Change in the CMIP5 Earth System Models|journal=Journal of Climate|volume=26|issue=6|pages=1877–1900|doi=10.1175/JCLI-D-12-00228.1|osti=1172703 |url=http://www.escholarship.org/uc/item/9cv093s8|doi-access=free}}</ref><ref>{{Cite journal |last1=Armstrong McKay |first1=David I. |last2=Staal |first2=Arie |last3=Abrams |first3=Jesse F. |last4=Winkelmann |first4=Ricarda |last5=Sakschewski |first5=Boris |last6=Loriani |first6=Sina |last7=Fetzer |first7=Ingo |last8=Cornell |first8=Sarah E. |last9=Rockström |first9=Johan |last10=Lenton |first10=Timothy M. |date=2022-09-09 |title=Exceeding 1.5°C global warming could trigger multiple climate tipping points |journal=Science |volume=377 |issue=6611 |pages=eabn7950 |doi=10.1126/science.abn7950 |pmid=36074831 |hdl=10871/131584 |s2cid=252161375 |hdl-access=free }}</ref> Wetlands drying out from drainage or evaporation compromises the ability of plants and animals to survive.<ref name="Koven 1877–1900"/> When permafrost continues to diminish, many climate change scenarios will be amplified. In areas where there is a lot of permafrost, nearby human infrastructure may be damaged severely by the thawing of permafrost.<ref>{{Cite report|last1=Nelson|first1=F. E.|last2=Anisimov|first2=O. A.|last3=Shiklomanov|first3=N. I.|date=2002-07-01|title=Climate Change and Hazard Zonation in the Circum-Arctic Permafrost Regions|journal=Natural Hazards |volume=26|issue=3|pages=203–225|doi=10.1023/A:1015612918401|s2cid=35672358 }}</ref><ref>{{Cite book |last1=Barry |first1=Roger Graham |title=The global cryosphere past, present and future |last2=Gan |first2=Thian-Yew |date=2021 |isbn=978-1-108-48755-9 |edition=Second revised |location=Cambridge, United Kingdom |oclc=1256406954}}</ref>{{rp|236}} It is believed that [[Permafrost carbon cycle|carbon storage in permafrost]] globally is approximately 1600 gigatons, equivalent to twice the atmospheric pool.<ref>{{cite book |last1=Programme |first1=United Nations Environment |title=The Natural Fix? The Role of Ecosystems in Climate Mitigation: A UNEP Rapid Response Assessment |date=2009 |isbn=978-82-7701-057-1 |hdl=20.500.11822/7852 |pages=20, 55 }}</ref>
+The [[Melnikov Permafrost Institute]] in Yakutsk, found that the sinking of large buildings into the ground can be prevented by using pile foundations extending down to {{convert|15|m}} or more. At this depth the temperature does not change with the seasons, remaining at about {{convert|-5|C}}.<ref>{{Cite book|last1=Sanger|first1=Frederick J.|url=https://books.google.com/books?id=YDArAAAAYAAJ&q=yakutsk+pile+foundations+on+permafrost&pg=PA786|title=Permafrost: Second International Conference, July 13-28, 1973 : USSR Contribution|last2=Hyde|first2=Peter J.|date=1978-01-01|publisher=National Academies|isbn=978-0-309-02746-5|page=786 }}</ref>
-=== Historical changes ===
-[[File:Beaufort Permafrost2.JPG|thumb|right|Recently thawed Arctic permafrost and coastal erosion on the Beaufort Sea, Arctic Ocean, near [[Point Lonely Short Range Radar Site|Point Lonely, Alaska]] in 2013.]]
+[[Yakutsk]] is one of two large cities in the world built in areas of continuous permafrost—that is, where the frozen soil forms an unbroken, below-zero sheet. The other is [[Norilsk]], in Krasnoyarsk Krai, Russia.<ref name="NY11022">{{cite magazine|author1=Joshua Yaffa|date=January 20, 2022|title=The Great Siberian Thaw|magazine=The New Yorker|url=https://www.newyorker.com/magazine/2022/01/17/the-great-siberian-thaw|access-date=January 20, 2022}}</ref>
-At the [[Last Glacial Maximum]], continuous permafrost covered a much greater area than it does today, covering all of ice-free [[Europe]] south to about [[Szeged]] (southeastern Hungary) and the [[Sea of Azov]] (then dry land)<ref>Sidorchuk, Aleksey, Borisova Olga and Panin; Andrey; [http://www.fluvial-systems.net/present_en/global.pdf “Fluvial response to the late Valdai/Holocene environmental change on the East European plain”] {{Webarchive|url=https://web.archive.org/web/20131226230314/http://www.fluvial-systems.net/present_en/global.pdf |date=2013-12-26 }}</ref> and [[East Asia]] south to present-day [[Changchun]] and [[Abashiri, Hokkaidō|Abashiri]].<ref>Yugo Ono and Tomohisa Irino; “Southern migration of westerlies in the Northern Hemisphere PEP II transect during the Last Glacial Maximum” in ''Quaternary International'' 118–119 (2004); pp. 13–22</ref> In [[North America]], only an extremely narrow belt of permafrost existed south of the [[ice sheet]] at about the latitude of [[New Jersey]] through southern [[Iowa]] and northern [[Missouri]], but permafrost was more extensive in the drier western regions where it extended to the southern border of [[Idaho]] and [[Oregon]].<ref>Malde, H.E.; “Patterned Ground in the Western Snake River Plain, Idaho, and Its Possible Cold-Climate Origin”; in ''Geological society of America Bulletin''; v. 75 no. 3 (March 1964); pp. 191–208</ref> In the southern hemisphere, there is some evidence for former permafrost from this period in central [[Otago]] and [[Argentina|Argentine]] [[Patagonia]], but was probably discontinuous, and is related to the tundra. Alpine permafrost also occurred in the [[Drakensberg]] during glacial maxima above about {{convert|3000|m|ft|-1}}.<ref>Grab, Stefan; “Characteristics and palaeoenvironmental significance of relict sorted patterned ground, Drakensberg plateau, southern Africa” in ''Quaternary Science Reviews'', vol. 21, issues 14–15, (August 2002), pp. 1729–1744</ref><ref>"Inventory of fossil cryogenic forms and structures in Patagonia and the mountains of Argentina beyond the Andes". South African Journal of Science, 98: 171–180, Review Articles, Pretoria, Sudáfrica.</ref>
-=== Thaw ===
-{{See also|Thermokarst}}
+{{Clear}}
-By definition, permafrost is ground that remains frozen for two or more years.<ref name=":1" /> The ground can consist of many substrate materials, including bedrock, sediment, organic matter, water or ice. Frozen ground is that which is below the freezing point of water, whether or not water is present in the substrate. Ground ice is not always present, as may be the case with nonporous bedrock, but it frequently occurs and may be present in amounts exceeding the potential [[Phreatic zone|hydraulic saturation]] of the thawed substrate.
+<gallery mode="packed" heights="150px">
+File:PICT4417Sykhus.JPG|Modern buildings in permafrost zones may be built on piles to avoid permafrost-thaw foundation failure from the heat of the building.
-During thaw, the ice content of the soil melts and, as the water drains or evaporates, causes the soil structure to weaken and sometimes become viscous until it regains strength with decreasing moisture content. Thawing can also influence the rate of change of [[soil gas]]es with the atmosphere.<ref>{{cite journal |last1=Kim |first1=D |last2=Vargas |first2=R |last3=Bond-Lamberty |first3=B |last4=Turetsky |first4=M |title=Effects of soil rewetting and thawing on soil gas fluxes: a review of current literature and suggestions for future research |journal=Biogeosciences |date=2012 |volume=9 |issue=7 |pages=2459–2483 |doi=10.5194/bg-9-2459-2012|bibcode=2012BGeo....9.2459K |doi-access=free }}</ref> One visible sign of permafrost degradation is the [[Drunken trees|random displacement of trees from their vertical orientation]] in permafrost areas.<ref>{{Cite book|last=Huissteden|first=J. van|url=https://books.google.com/books?id=mZPHDwAAQBAJ&q=permafrost+thaw|title=Thawing Permafrost: Permafrost Carbon in a Warming Arctic|date=2020|publisher=Springer Nature|isbn=978-3-030-31379-1|page=296 }}</ref>
+File:Trans-Alaska Pipeline (1).jpg|[[Heat pipe#Permafrost cooling|Heat pipes in vertical supports]] maintain a frozen bulb around portions of the [[Trans-Alaska Pipeline]] that are at risk of thawing.
+File:Yakoutsk Construction d'immeuble.jpg|Pile foundations in [[Yakutsk]], a city underlain with continuous permafrost.
-<gallery mode="packed" heights="180" style="font-size:100%; line-height:130%">
+File:Raised pipes in permafrost.jpg|[[District heating]] pipes run above ground in Yakutsk to avoid thawing permafrost.
-File:Permafrost in Herschel Island 001.jpg|Thawing permafrost in [[Herschel Island]], Canada, 2013
-File:Permafrost in Herschel Island 015.jpg|Permafrost and ice in [[Herschel Island]], Canada, 2012
-File:Permafrost thaw ponds in Hudson Bay Canada near Greenland.jpg|Permafrost thaw ponds on peatland in [[Hudson Bay]], Canada in 2008.<ref>{{cite journal |last1=Dyke |first1=Larry D. |last2=Sladen |first2=Wendy E. |title=Permafrost and Peatland Evolution in the Northern Hudson Bay Lowland, Manitoba |journal=Arctic |date=3 December 2010 |volume=63 |issue=4 |pages=429–441 |doi=10.14430/arctic3332 }}</ref>
 </gallery>
-===Effect on slope stability===
+==Impacts of climate change==
+{{See also|Thermokarst}}
-Over the past century, an increasing number of alpine rock slope failure events in mountain ranges around the world have been recorded. It is expected that the high number of structural failures is due to permafrost thawing, which is thought to be linked to climate change. Permafrost thawing is thought to have contributed to the 1987 [[Val Pola landslide]] that killed 22 people in the Italian Alps.<ref>{{Cite journal|last1=F.|first1=Dramis|last2=M.|first2=Govi|last3=M.|first3=Guglielmin|last4=G.|first4=Mortara|date=1995-01-01|title=Mountain permafrost and slope instability in the Italian Alps: The Val Pola Landslide|journal=Permafrost and Periglacial Processes|volume=6|issue=1|doi=10.1002/ppp.3430060108 |pages=73–81}}</ref> In mountain ranges, much of the structural stability can be attributed to glaciers and permafrost. As climate warms, permafrost thaws, which results in a less stable mountain structure, and ultimately more slope failures.<ref>{{Citation
+[[File:Beaufort Permafrost2.JPG|thumb|left|Recently thawed Arctic permafrost and coastal erosion on the Beaufort Sea, Arctic Ocean, near [[Point Lonely Short Range Radar Site|Point Lonely, Alaska]] in 2013.]]
- | last1 = Huggel
+<!-- this first paragraph is also transcribed to [[effects of climate change]] -->
- | first1 = C.
+Globally, permafrost warmed by about {{val|0.3|u=degC}} between 2007 and 2016, with stronger warming observed in the continuous permafrost zone relative to the discontinuous zone. This inevitably causes permafrost to thaw. Permafrost extent has been diminishing for decades, and more decline is expected in the future.<ref name="AR6_WG1_Chapter92" />{{rp|1280}} This causes a wide range of issues, and [[International Permafrost Association]] (IPA) exists to help address them. It convenes International Permafrost Conferences and maintains [[Global Terrestrial Network for Permafrost]], which undertakes special projects such as preparing databases, maps, bibliographies, and glossaries, and coordinates international field programmes and networks.<ref>{{cite web|author= |url=https://www.permafrost.org/frozen-ground-newsletter/ |title=Frozen Ground, the News Bulletin of the IPA |language= |website=International Permafrost Association |date= 2014-02-10|accessdate=2016-04-28}}</ref>
- | last2 = Allen
- | first2 = S.
- | last3 = Deline
- | first3 = P.
- | title = Ice thawing, mountains falling; are alpine rock slope failures increasing?
- | journal = Geology Today
- | volume = 28
- | issue = 3
- | pages = 98–104
- |date= June 2012
- | doi =10.1111/j.1365-2451.2012.00836.x
- | s2cid = 128619284
- |display-authors=etal}}
-</ref>
-McSaveney<ref>{{cite book |doi=10.1130/REG15 |title=Catastrophic Landslides: Effects, Occurrence, and Mechanisms |series=Reviews in Engineering Geology |year=2002 |volume=15 |isbn=0-8137-4115-7 }}</ref> reported massive rock and ice falls (up to 11.8&nbsp;million m<sup>3</sup>), earthquakes (up to 3.9 Richter), floods (up to 7.8&nbsp;million m<sup>3</sup> water), and rapid rock-ice flow to long distances (up to 7.5&nbsp;km at 60&nbsp;m/s) caused by “instability of slopes” in high mountain permafrost. Instability of slopes in permafrost at elevated temperatures near freezing point in warming permafrost is related to effective stress and buildup of pore-water pressure in these soils.<ref>{{cite book|last1=Nater|first1=P.|last2=Arenson|first2=L.U.|last3=Springman|first3=S.M.|title=Choosing geotechnical parameters for slope stability assessments in alpine permafrost soils. In 9th international conference on permafrost.|date=2008|publisher=University of Alaska|location=Fairbanks, USA|isbn=978-0-9800179-3-9|pages=1261–1266}}</ref>  Kia and his co-inventors<ref>{{cite web|last1=Kia|first1=Mohammadali|last2=Sego|first2=David Charles|last3=Morgenstern|first3=Norbert Rubin|title=FRP: Filter-less Rigid Piezometer for Measuring Pore-Water Pressure in Partially Frozen Soils|url=https://www.alphaadroit.ca/services/frozen-ground-and-permafrost-engineering.html|website=Alpha Adroit Engineering Ltd|publisher=Alpha Adroit Engineering Ltd|access-date=27 January 2018|ref=FRP|archive-url=https://web.archive.org/web/20180128190509/https://www.alphaadroit.ca/services/frozen-ground-and-permafrost-engineering.html|archive-date=28 January 2018|url-status=live}}</ref> invented a new filter-less rigid piezometer (FRP) for measuring pore-water pressure in partially frozen soils such as warming permafrost soils. They extended the use of effective stress concept to partially frozen soils for use in slope stability analysis of warming permafrost slopes. The use of effective stress concept has many advantages such as ability to extend the concepts of "Critical State Soil Mechanics" into frozen ground engineering.{{citation needed|date=October 2021}}
+===Thaw-induced soil instability===
-In high mountains [[rockfall]]s may be caused by thawing of rock masses with permafrost.<ref name=Arnaud>{{Cite journal|last=Temme|first=Arnaud J. A. M.|date=2015|title=Using Climber's Guidebooks to Assess Rock Fall Patterns Over Large Spatial and Decadal Temporal Scales: An Example from the Swiss Alps|journal=[[Geografiska Annaler|Geografiska Annaler: Series A, Physical Geography]] |volume=97|issue=4|pages=793–807|doi=10.1111/geoa.12116|s2cid=55361904}}</ref>
+[[File:Permafrost in Herschel Island 001.jpg|thumb|Thawing permafrost in [[Herschel Island]], Canada, 2013.]]
+As the water drains or evaporates, soil structure weakens and sometimes becomes viscous until it regains strength with decreasing moisture content. One visible sign of permafrost degradation is the [[Drunken trees|random displacement of trees from their vertical orientation]] in permafrost areas.<ref>{{Cite book|last=Huissteden|first=J. van|url=https://books.google.com/books?id=mZPHDwAAQBAJ&q=permafrost+thaw|title=Thawing Permafrost: Permafrost Carbon in a Warming Arctic|date=2020|publisher=Springer Nature|isbn=978-3-030-31379-1|page=296 }}</ref> Global warming has been increasing permafrost slope disturbances and sediment supplies to fluvial systems, resulting in exceptional increases in river sediment. <ref>{{cite journal |last1=Li |first1=Dongfeng |last2=Lu |first2=Xixi |last3=Overeem |first3=Irina |last4=Walling |first4=Desmond E. |last5=Syvitski |first5=Jaia |last6=Kettner |first6=Albert J. |last7=Bookhagen |first7=Bodo |last8=Zhou |first8=Yinjun |last9=Zhang |first9=Ting |title=Exceptional increases in fluvial sediment fluxes in a warmer and wetter High Mountain Asia |journal=Science |date=29 October 2021 |volume=374 |issue=6567 |pages=599–603 |doi=10.1126/science.abi9649 |pmid=34709922 |bibcode=2021Sci...374..599L |s2cid=240152765 }}</ref> On the other hands, disturbance of formerly hard soil increases drainage of water reservoirs in northern [[wetland]]s. This can dry them out and compromise the survival of plants and animals used to the wetland ecosystem.<ref name="Koven 1877–1900"/>
+In high mountains, permafrost thaw causes buildup of pore-water pressure and increases stress, which may lead to slope failure and [[rockfall]]s.<ref>{{cite book|last1=Nater|first1=P.|last2=Arenson|first2=L.U.|last3=Springman|first3=S.M.|title=Choosing geotechnical parameters for slope stability assessments in alpine permafrost soils. In 9th international conference on permafrost.|date=2008|publisher=University of Alaska|location=Fairbanks, USA|isbn=978-0-9800179-3-9|pages=1261–1266}}</ref><ref name=Arnaud>{{Cite journal|last=Temme|first=Arnaud J. A. M.|date=2015|title=Using Climber's Guidebooks to Assess Rock Fall Patterns Over Large Spatial and Decadal Temporal Scales: An Example from the Swiss Alps|journal=[[Geografiska Annaler|Geografiska Annaler: Series A, Physical Geography]] |volume=97|issue=4|pages=793–807|doi=10.1111/geoa.12116|s2cid=55361904}}</ref> Over the past century, an increasing number of alpine rock slope failure events in mountain ranges around the world have been recorded, and some have been attributed to permafrost thaw induced by climate change. The 1987 [[Val Pola landslide]] that killed 22 people in the [[Italian Alps]] is considered one such example.<ref>{{Cite journal|last1=F.|first1=Dramis|last2=M.|first2=Govi|last3=M.|first3=Guglielmin|last4=G.|first4=Mortara|date=1995-01-01|title=Mountain permafrost and slope instability in the Italian Alps: The Val Pola Landslide|journal=Permafrost and Periglacial Processes|volume=6|issue=1|doi=10.1002/ppp.3430060108 |pages=73–81}}</ref> In mountain ranges, much of the structural stability can be attributed to glaciers and permafrost. As climate warms, permafrost thaws, which results in a less stable mountain structure, and ultimately more slope failures.<ref>{{Citation| last1 = Huggel| first1 = C.| last2 = Allen| first2 = S.| last3 = Deline| first3 = P.| title = Ice thawing, mountains falling; are alpine rock slope failures increasing?| journal = Geology Today| volume = 28| issue = 3| pages = 98–104|date= June 2012| doi =10.1111/j.1365-2451.2012.00836.x| s2cid = 128619284|display-authors=etal}}</ref>
-====Frozen debris lobes====
+[[File:Permafrost in Herschel Island 015.jpg|thumb|left|Permafrost and ice in [[Herschel Island]], Canada, 2012.]]
-According to the [[University of Alaska Fairbanks]], frozen debris lobes (FDLs) are "slow-moving landslides composed of soil, rocks, trees, and ice that occur in permafrost.<ref name="UAF FDLs 2022">{{Cite web| title = FDL: Frozen Debris Lobes | date = 7 January 2022| access-date = 7 January 2022 |series=FDLs |work=[[University of Alaska Fairbanks]]| url = https://fdlalaska.org/}}</ref>  As of December 2021, there were 43 frozen debris lobes identified in the southern Brooks Range along the [[Trans Alaska Pipeline System]] (TAPS) corridor and the main highway linking [[Interior Alaska]] and the [[Alaska North Slope]]—the [[Dalton Highway]].<ref name="Hasemyer 2021">{{Cite web | last = Hasemyer| first = David| title = Unleashed by Warming, Underground Debris Fields Threaten to 'Crush' Alaska's Dalton Highway and the Alaska Pipeline | work = Inside Climate News | access-date = 7 January 2022| date = 20 December 2021
-| url = https://insideclimatenews.org/news/20122021/alaska-frozen-debris-lobes-dalton-highway-pipeline-climate-change/}}</ref> By 2012, some FDLs measured over {{convert|100|metre|yards|abbr=on}} in width, {{convert|20|metre|yards|abbr=on}} in height, and {{convert|1000|metre|yards|abbr=on}} in length.<ref name="Daanen 2012"/>{{rp|1521}} Based on measurements of a frozen debris-lobe southern Brooks Range in Alaska taken from 2008 to 2010, researchers found accelerated movement as ice in deeper layers of soil melted with rising temperatures. Ice within the soil melts, causing loss of soil strength, accelerated movement, and potential debris flows. They raised concerns of a future potential hazard of one debris lobe to both the [[Trans Alaska Pipeline System]] and the main highway linking Interior Alaska and the North Slope—Dalton Highway.<ref name="Daanen 2012">{{Cite journal | doi = 10.5194/nhess-12-1521-2012 | volume = 12 | pages = 1521–1537 | last1 = Daanen | first1 = Ronald | last2 = Grosse | first2 = Guido | last3 = Darrow | first3 = Margaret | last4 = Hamilton | first4 = T. | last5 = Jones
+In 2002, massive rock and ice falls (up to 11.8&nbsp;million m<sup>3</sup>), [[earthquake]]s (up to 3.9 [[Richter scale|Richter]]), [[flood]]s (up to 7.8&nbsp;million m<sup>3</sup> water), and rapid rock-ice flow to long distances (up to 7.5&nbsp;km at 60&nbsp;m/s) were attributed to slope instability in high mountain permafrost.<ref>{{cite book |doi=10.1130/REG15 |title=Catastrophic Landslides: Effects, Occurrence, and Mechanisms |series=Reviews in Engineering Geology |year=2002 |volume=15 |isbn=0-8137-4115-7 }}</ref> Permafrost thaw can also result in the formation of frozen debris lobes (FDLs), which are defined as "slow-moving landslides composed of soil, rocks, trees, and ice".<ref name="UAF FDLs 2022">{{Cite web| title = FDL: Frozen Debris Lobes | date = 7 January 2022| access-date = 7 January 2022 |series=FDLs |work=[[University of Alaska Fairbanks]]| url = https://fdlalaska.org/}}</ref> This is a notable issue in the [[Alaska]]'s southern [[Brooks Range]], where some FDLs measured over {{convert|100|metre|yards|abbr=on}} in width, {{convert|20|metre|yards|abbr=on}} in height, and {{convert|1000|metre|yards|abbr=on}} in length by 2012.<ref name="Daanen 2012">{{Cite journal | doi = 10.5194/nhess-12-1521-2012 | volume = 12 | pages = 1521–1537 | last1 = Daanen | first1 = Ronald | last2 = Grosse | first2 = Guido | last3 = Darrow | first3 = Margaret | last4 = Hamilton | first4 = T. | last5 = Jones
 | first5 = Benjamin | title = Rapid movement of frozen debris-lobes: Implications for permafrost degradation and slope instability in the south-central Brooks Range, Alaska | journal = Natural Hazards and Earth System Sciences
-| date = 21 May 2012| issue = 5 | bibcode = 2012NHESS..12.1521D | doi-access = free }}</ref><ref name="Darrow 2016">{{cite journal |last1=Darrow |first1=Margaret M. |last2=Gyswyt |first2=Nora L. |last3=Simpson |first3=Jocelyn M. |last4=Daanen |first4=Ronald P. |last5=Hubbard |first5=Trent D. |title=Frozen debris lobe morphology and movement: an overview of eight dynamic features, southern Brooks Range, Alaska |journal=The Cryosphere |date=12 May 2016 |volume=10 |issue=3 |pages=977–993 |doi=10.5194/tc-10-977-2016 |bibcode=2016TCry...10..977D |doi-access=free }}</ref>
+| date = 21 May 2012| issue = 5 | bibcode = 2012NHESS..12.1521D | doi-access = free }}</ref><ref name="Darrow 2016">{{cite journal |last1=Darrow |first1=Margaret M. |last2=Gyswyt |first2=Nora L. |last3=Simpson |first3=Jocelyn M. |last4=Daanen |first4=Ronald P. |last5=Hubbard |first5=Trent D. |title=Frozen debris lobe morphology and movement: an overview of eight dynamic features, southern Brooks Range, Alaska |journal=The Cryosphere |date=12 May 2016 |volume=10 |issue=3 |pages=977–993 |doi=10.5194/tc-10-977-2016 |bibcode=2016TCry...10..977D |doi-access=free }}</ref> As of December 2021, there were 43 frozen debris lobes identified in the southern Brooks Range, where they could potentially threaten both the [[Trans Alaska Pipeline System]] (TAPS) corridor and the [[Dalton Highway]], which is the main transport link between the [[Interior Alaska]] and the [[Alaska North Slope]].<ref name="Hasemyer 2021">{{Cite web | last = Hasemyer| first = David| title = Unleashed by Warming, Underground Debris Fields Threaten to 'Crush' Alaska's Dalton Highway and the Alaska Pipeline | work = Inside Climate News | access-date = 7 January 2022| date = 20 December 2021| url = https://insideclimatenews.org/news/20122021/alaska-frozen-debris-lobes-dalton-highway-pipeline-climate-change/}}</ref>
-===Ecological consequences===
+====Infrastructure====
+A wide range of infrastructure in permafrost areas is threatened by the thaw.<ref name="Nelson2022">{{Cite report|last1=Nelson|first1=F. E.|last2=Anisimov|first2=O. A.|last3=Shiklomanov|first3=N. I.|date=2002-07-01|title=Climate Change and Hazard Zonation in the Circum-Arctic Permafrost Regions|journal=Natural Hazards |volume=26|issue=3|pages=203–225|doi=10.1023/A:1015612918401|s2cid=35672358 }}</ref><ref>{{Cite book |last1=Barry |first1=Roger Graham |title=The global cryosphere past, present and future |last2=Gan |first2=Thian-Yew |date=2021 |isbn=978-1-108-48755-9 |edition=Second revised |location=Cambridge, United Kingdom |oclc=1256406954}}</ref>{{rp|236}} In May 2020, thawing permafrost at Norilsk-Taimyr Energy's Thermal Power Plant No. 3 caused an oil storage tank to collapse, spilling 6,000 tonnes of [[diesel]] into the land, 15,000 into the water. The rivers [[Ambarnaya]], [[Daldykan]] and many smaller rivers were polluted. The pollution reached the lake [[Pyasino]] that is important to the water supply of the entire [[Taimyr Peninsula]]. [[State of emergency]] at the federal level was declared. Many buildings and infrastructure are built on permafrost, which cover 65% of Russian territory, and all those can be damaged as it thaws. <ref name=TASS>{{cite news |title=Diesel fuel spill in Norilsk in Russia's Arctic contained |url=https://tass.com/emergencies/1164423 |access-date=7 June 2020 |work=[[TASS]] |date=5 June 2020 |location=Moscow, Russia}}</ref><ref name=ft>{{citation |url=https://www.ft.com/content/fa9c20a0-2dad-4992-9686-0ec98b44faa8 |archive-url=https://ghostarchive.org/archive/20221210/https://www.ft.com/content/fa9c20a0-2dad-4992-9686-0ec98b44faa8 |archive-date=10 December 2022 |url-access=subscription |title=Siberia fuel spill threatens Moscow's Arctic ambitions |author=Max Seddon |work=[[Financial Times]] |date=4 June 2020}}</ref> The [[2020 Norilsk oil spill]] has been described as the second-largest oil spill in modern Russian history.<ref name=nyt>{{citation |url=https://www.nytimes.com/2020/06/04/world/europe/russia-oil-spill-arctic.html |title=Russia Declares Emergency After Arctic Oil Spill |author=Ivan Nechepurenko |work=[[New York Times]] |date=5 June 2020}}</ref> The thawing can also cause leakage of toxic elements from sites of buried toxic waste.<ref name="nyt" /><ref>{{cite news |last1=ANTONOVA |first1=MARIA |title=Russia Says Melting Permafrost Is Behind The Massive Arctic Fuel Spill |url=https://www.sciencealert.com/russia-claims-melting-permafrost-is-behind-the-massive-arctic-fuel-spill |access-date=19 July 2020 |agency=Science Daily |date=5 June 2020}}</ref>
-In the northern circumpolar region, permafrost contains 1700&nbsp;billion tons of organic material equaling almost half of all organic material in all soils.<ref name="Tarnocai 2009">{{cite journal|last1=Tarnocai|display-authors=etal|year=2009|title=Soil organic carbon pools in the northern circumpolar permafrost region|journal=Global Biogeochemical Cycles|volume=23|issue=2|page=GB2023|bibcode=2009GBioC..23.2023T|doi=10.1029/2008gb003327|doi-access=free}}</ref> This pool was built up over thousands of years and is only slowly degraded under the cold conditions in the Arctic. The amount of carbon sequestered in permafrost is four times the carbon that has been released to the atmosphere due to human activities in modern time.<ref name="Schuur 2011">{{cite journal | last1 = Schuur | display-authors = etal   | year = 2011 | title = High risk of permafrost thaw | url = https://digital.library.unt.edu/ark:/67531/metadc836756/| journal = Nature | volume = 480 | issue = 7375| pages = 32–33 | doi=10.1038/480032a| pmid = 22129707   | bibcode = 2011Natur.480...32S| s2cid = 4412175 | doi-access = free }}</ref> One manifestation of this is [[yedoma]], which is an organic-rich (about 2% carbon by mass) [[Pleistocene]]-age [[loess]] permafrost with ice content of 50–90% by volume.<ref>{{cite journal |vauthors=Walter KM, Zimov SA, Chanton JP, Verbyla D, Chapin FS |title=Methane bubbling from Siberian thaw lakes as a positive feedback to climate warming |journal=Nature |volume=443 |issue=7107 |pages=71–5 |date=September 2006 |pmid=16957728 |doi=10.1038/nature05040 |bibcode=2006Natur.443...71W |s2cid=4415304 }}</ref>
+It's been estimated that nearly 70% of infrastructure located in the permafrost areas is at risk by 2050, while the associated costs could rise to tens of billions of dollars in the second half of the century. <ref name="Hjort2022">{{Cite journal |last1=Hjort |first1=Jan |last2=Streletskiy |first2=Dmitry |last3=Doré |first3=Guy |last4=Wu |first4=Qingbai |last5=Bjella |first5=Kevin |last6=Luoto |first6=Miska |date=11 January 2022 |title=Impacts of permafrost degradation on infrastructure |journal=Nature Reviews Earth & Environment |volume=3 |pages=24–38 |doi=10.1029/2022JG006956}}</ref>
-Formation of permafrost has significant consequences for ecological systems, primarily due to constraints imposed upon rooting zones, but also due to limitations on den and [[burrow]] geometries for [[fauna]] requiring subsurface homes. Secondary effects impact [[species]] dependent on plants and animals whose habitat is constrained by the permafrost. One of the most widespread examples is the dominance of [[black spruce]] in extensive permafrost areas, since this species can tolerate rooting pattern constrained to the near surface.<ref>C. Michael Hogan, [http://globaltwitcher.auderis.se/artspec_information.asp?thingid=44751 ''Black Spruce: Picea mariana'', GlobalTwitcher.com, ed. Nicklas Stromberg, November, 2008] {{webarchive|url=https://web.archive.org/web/20111005174426/http://globaltwitcher.auderis.se/artspec_information.asp?thingid=44751 |date=2011-10-05 }}</ref>
-The number of bacteria in permafrost soil varies widely, typically from 1 to 1000&nbsp;million per gram of soil.<ref>{{cite journal | last1 = Hansen |display-authors=etal  | year = 2007 | title = Viability, diversity and composition of the bacterial community in a high Arctic permafrost soil from Spitsbergen, Northern Norway | journal = Environmental Microbiology | volume = 9 | issue = 11| pages = 2870–2884 | doi=10.1111/j.1462-2920.2007.01403.x| pmid =  17922769}} – and additional references in this paper. {{cite journal | last1 = Yergeau |display-authors=etal  | year = 2010 | title = The functional potential of high Arctic permafrost revealed by metagenomic sequencing, qPCR and microarray analyses | journal = The ISME Journal | volume = 4 | issue = 9| pages = 1206–1214 | doi=10.1038/ismej.2010.41| pmid =  20393573| doi-access = free }}</ref> Most of these bacteria and fungi in permafrost soil cannot be cultured in the laboratory, but the identity of the microorganisms can be revealed by DNA-based techniques.
-Global warming has been increasing permafrost slope disturbances and sediment supplies to fluvial systems, resulting in exceptional increases in river sediment. <ref>{{cite journal |last1=Li |first1=Dongfeng |last2=Lu |first2=Xixi |last3=Overeem |first3=Irina |last4=Walling |first4=Desmond E. |last5=Syvitski |first5=Jaia |last6=Kettner |first6=Albert J. |last7=Bookhagen |first7=Bodo |last8=Zhou |first8=Yinjun |last9=Zhang |first9=Ting |title=Exceptional increases in fluvial sediment fluxes in a warmer and wetter High Mountain Asia |journal=Science |date=29 October 2021 |volume=374 |issue=6567 |pages=599–603 |doi=10.1126/science.abi9649 |pmid=34709922 |bibcode=2021Sci...374..599L |s2cid=240152765 }}</ref>
-{{Clear}}
 ===Climate change feedback===
 {{See also|Arctic methane emissions}}
+[[File:Permafrost thaw ponds in Hudson Bay Canada near Greenland.jpg|thumb|Permafrost thaw ponds on peatland in [[Hudson Bay]], Canada in 2008.<ref>{{cite journal |last1=Dyke |first1=Larry D. |last2=Sladen |first2=Wendy E. |title=Permafrost and Peatland Evolution in the Northern Hudson Bay Lowland, Manitoba |journal=Arctic |date=3 December 2010 |volume=63 |issue=4 |pages=429–441 }}</ref>]]
+In the northern circumpolar region, permafrost contains 1700&nbsp;billion tons of organic material equaling almost half of all organic material in all soils.<ref name="Tarnocai 2009">{{cite journal|last1=Tarnocai|display-authors=etal|year=2009|title=Soil organic carbon pools in the northern circumpolar permafrost region|journal=Global Biogeochemical Cycles|volume=23|issue=2|page=GB2023|bibcode=2009GBioC..23.2023T|doi=10.1029/2008gb003327|doi-access=free}}</ref><ref>{{cite book |last1=Programme |first1=United Nations Environment |title=The Natural Fix? The Role of Ecosystems in Climate Mitigation: A UNEP Rapid Response Assessment |date=2009 |isbn=978-82-7701-057-1 |hdl=20.500.11822/7852 |pages=20, 55 }}</ref>  This pool was built up over thousands of years and is only slowly degraded under the cold conditions in the Arctic. The amount of carbon sequestered in permafrost is four times the carbon that has been released to the atmosphere due to human activities in modern time.<ref name="Schuur 2011">{{cite journal | last1 = Schuur | display-authors = etal   | year = 2011 | title = High risk of permafrost thaw | url = https://digital.library.unt.edu/ark:/67531/metadc836756/| journal = Nature | volume = 480 | issue = 7375| pages = 32–33 | doi=10.1038/480032a| pmid = 22129707   | bibcode = 2011Natur.480...32S| s2cid = 4412175 | doi-access = free }}</ref> One manifestation of this is [[yedoma]], which is an organic-rich (about 2% carbon by mass) [[Pleistocene]]-age [[loess]] permafrost with ice content of 50–90% by volume.<ref>{{cite journal |vauthors=Walter KM, Zimov SA, Chanton JP, Verbyla D, Chapin FS |title=Methane bubbling from Siberian thaw lakes as a positive feedback to climate warming |journal=Nature |volume=443 |issue=7107 |pages=71–5 |date=September 2006 |pmid=16957728 |doi=10.1038/nature05040 |bibcode=2006Natur.443...71W |s2cid=4415304 }}</ref>
+Thawing can also influence the rate of change of [[soil gas]]es with the atmosphere.<ref>{{cite journal |last1=Kim |first1=D |last2=Vargas |first2=R |last3=Bond-Lamberty |first3=B |last4=Turetsky |first4=M |title=Effects of soil rewetting and thawing on soil gas fluxes: a review of current literature and suggestions for future research |journal=Biogeosciences |date=2012 |volume=9 |issue=7 |pages=2459–2483 |doi=10.5194/bg-9-2459-2012|bibcode=2012BGeo....9.2459K |doi-access=free }}</ref><ref name="Koven 1877–1900">{{Cite journal|last1=Koven|first1=Charles D.|last2=Riley|first2=William J.|last3=Stern|first3=Alex|date=2012-10-01|title=Analysis of Permafrost Thermal Dynamics and Response to Climate Change in the CMIP5 Earth System Models|journal=Journal of Climate|volume=26|issue=6|pages=1877–1900|doi=10.1175/JCLI-D-12-00228.1|osti=1172703 |url=http://www.escholarship.org/uc/item/9cv093s8|doi-access=free}}</ref>
 {{excerpt|Permafrost carbon cycle#Carbon release from the permafrost|paragraphs=1-3}}
@@ Line 490: / Line 471: @@
 {{excerpt|Permafrost carbon cycle#Cumulative}}
-== Preservation of organisms in permafrost ==
+=== Revival of preserved microorganisms ===
+The number of bacteria in permafrost soil varies widely, typically from 1 to 1000&nbsp;million per gram of soil.<ref>{{cite journal | last1 = Hansen |display-authors=etal  | year = 2007 | title = Viability, diversity and composition of the bacterial community in a high Arctic permafrost soil from Spitsbergen, Northern Norway | journal = Environmental Microbiology | volume = 9 | issue = 11| pages = 2870–2884 | doi=10.1111/j.1462-2920.2007.01403.x| pmid =  17922769}} – and additional references in this paper. {{cite journal | last1 = Yergeau |display-authors=etal  | year = 2010 | title = The functional potential of high Arctic permafrost revealed by metagenomic sequencing, qPCR and microarray analyses | journal = The ISME Journal | volume = 4 | issue = 9| pages = 1206–1214 | doi=10.1038/ismej.2010.41| pmid =  20393573| doi-access = free }}</ref> Most of these bacteria and fungi in permafrost soil cannot be cultured in the laboratory, but the identity of the microorganisms can be revealed by DNA-based techniques.
-=== Microbes ===
 Scientists predict that up to 10<sup>21</sup> microbes, including fungi and bacteria in addition to viruses, will be released from melting ice per year. Often, these microbes will be released directly into the ocean. Due to the migratory nature of many species of fish and birds, it is possible that these microbes have a high transmission rate.<ref name=":0">{{Cite journal|last1=Smith|first1=Alvin W.|last2=Skilling|first2=Douglas E.|last3=Castello|first3=John D.|last4=Rogers|first4=Scott O.|date=2004-01-01|title=Ice as a reservoir for pathogenic human viruses: specifically, caliciviruses, influenza viruses, and enteroviruses |journal=Medical Hypotheses |volume=63|issue=4|pages=560–566|doi=10.1016/j.mehy.2004.05.011|pmid=15324997 }}</ref>
@@ Line 503: / Line 483: @@
 A study of late Pleistocene Siberian permafrost samples from Kolyma Lowland (an east siberian lowland) used DNA isolation and gene cloning (specifically 16S rRNA genes) to determine which phyla these microorganisms belonged to. This technique allowed a comparison of known microorganisms to their newly discovered samples and revealed eight phylotypes, which belonged to the phyla [[Actinomycetota]] and [[Pseudomonadota]].<ref>{{Cite journal|last1=Kudryashova|first1=E. B.|last2=Chernousova|first2=E. Yu.|last3=Suzina|first3=N. E.|last4=Ariskina|first4=E. V.|last5=Gilichinsky|first5=D. A.|date=2013-05-01|title=Microbial diversity of Late Pleistocene Siberian permafrost samples|journal=Microbiology |volume=82|issue=3|pages=341–351|doi=10.1134/S0026261713020082|s2cid=2645648 }}</ref>
-=== Plants ===
+==== Preservation of plants ====
 In 2012, Russian researchers proved that permafrost can serve as a natural repository for ancient life forms by reviving of ''[[Silene stenophylla]]'' from 30,000 year old tissue found in an [[Last Glacial Period|Ice Age]] squirrel burrow in the [[Siberian]] permafrost. This is the oldest plant tissue ever revived. The plant was fertile, producing white flowers and viable seeds. The study demonstrated that tissue can survive ice preservation for tens of thousands of years.<ref>{{Citation|last=Isachenkov|first=Vladimir|title=Russians revive Ice Age flower from frozen burrow|date=February 20, 2012|url=http://phys.org/news/2012-02-russians-revive-ice-age-frozen.html|newspaper=Phys.Org|archive-url=https://web.archive.org/web/20160424214832/http://phys.org/news/2012-02-russians-revive-ice-age-frozen.html|access-date=2016-04-26|archive-date=2016-04-24|url-status=live}}</ref>
@@ Line 510: / Line 490: @@
 File:Phoenix_Sol_0_horizon.jpg|Permafrost polygons on Mars imaged by the [[Phoenix (spacecraft)|Phoenix lander]].
 File:PSP 008301 2480 cut a.jpg |False-color [[Mars Reconnaissance Orbiter]] image of polygonal surface pattern.
-File:Patterned_ground_devon_island.jpg |[[Patterned ground]] on earth.
-</gallery>
-== Other issues ==
-The [[International Permafrost Association]] (IPA) is an integrator of issues regarding permafrost. It convenes International Permafrost Conferences, undertakes special projects such as preparing databases, maps, bibliographies, and glossaries, and coordinates international field programmes and networks. Among other issues addressed by the IPA are: Problems for construction on permafrost owing to the change of soil properties of the ground on which structures are placed and the biological processes in permafrost, e.g. the preservation of organisms frozen ''in situ''.
-=== Construction on permafrost ===
-[[Yakutsk]] is one of two large cities in the world built in areas of continuous permafrost—that is, where the frozen soil forms an unbroken, below-zero sheet. The other is [[Norilsk]], in Krasnoyarsk Krai, Russia.<ref name="NY11022">{{cite magazine|author1=Joshua Yaffa|date=January 20, 2022|title=The Great Siberian Thaw|magazine=The New Yorker|url=https://www.newyorker.com/magazine/2022/01/17/the-great-siberian-thaw|access-date=January 20, 2022}}</ref>
-Building on permafrost is difficult because the heat of the building (or [[pipeline transport|pipeline]]) can warm the permafrost and destabilize the structure. Warming can result in thawing of the soil and its consequent weakening of support for a structure as the ice content turns to water; alternatively, where structures are built on piles, warming can cause movement through [[Creep (deformation)|creep]] because of the change of friction on the piles even as the soil remains frozen.<ref>{{Cite book|last=Fang|first=Hsai-Yang|url=https://books.google.com/books?id=X8hEt3l1SPQC&q=foundations+on+permafrost&pg=PA735|title=Foundation Engineering Handbook|date=1990-12-31|publisher=Springer Science & Business Media|isbn=978-0-412-98891-2|page=735 }}</ref> Additionally, there is no ground water available in an area underlain with permafrost. Any substantial settlement or installation needs to make some alternative arrangement to obtain water.<ref name="NY11022" />
-Three common solutions include: using [[foundation (architecture)|foundations]] on wood [[Deep foundation|piles]], a technique pioneered by Soviet engineer [[Mikhail Kim]] in Norilsk;<ref>{{Cite magazine|last=Yaffa|first=Joshua|date=2022-01-07|title=The Great Siberian Thaw|url=https://www.newyorker.com/magazine/2022/01/17/the-great-siberian-thaw|access-date=2022-01-12|magazine=The New Yorker }}</ref> building on a thick [[gravel]] pad (usually 1–2 metres/3.3–6.6 feet thick); or using [[anhydrous ammonia]] [[heat pipe]]s.<ref name="ASCE">
-{{cite book
- | last = Clarke
- | first = Edwin S.
- | title = Permafrost Foundations—State of the Practice
- | work = Monograph Series
- | publisher = American Society of Civil Engineers
- | date = 2007
- | url = https://books.google.com/books?id=O-voTug5apsC&pg=PA34
- | isbn = 978-0-7844-0947-3}}
-</ref> The [[Trans-Alaska Pipeline System]] uses [[Heat pipe#Permafrost cooling|heat pipes built into vertical supports]] to prevent the pipeline from sinking and the [[Qingzang railway]] in [[Tibet]] employs a variety of methods to keep the ground cool, both in areas with [[Frost heaving#Frost-susceptible soils|frost-susceptible soil]]. Permafrost may necessitate special enclosures for buried utilities, called "[[Utility tunnel#In Arctic towns|utilidors]]".<ref>{{Cite book|last=Woods|first=Kenneth B.|url=https://books.google.com/books?id=3jErAAAAYAAJ&q=utilidors+in+permafrost&pg=PA441|title=Permafrost International Conference: Proceedings|date=1966|publisher=National Academies|pages=418–57 }}</ref>
-The [[Melnikov Permafrost Institute]] in Yakutsk, found that the sinking of large buildings into the ground can be prevented by using pile foundations extending down to {{convert|15|m}} or more. At this depth the temperature does not change with the seasons, remaining at about {{convert|-5|C}}.<ref>{{Cite book|last1=Sanger|first1=Frederick J.|url=https://books.google.com/books?id=YDArAAAAYAAJ&q=yakutsk+pile+foundations+on+permafrost&pg=PA786|title=Permafrost: Second International Conference, July 13-28, 1973 : USSR Contribution|last2=Hyde|first2=Peter J.|date=1978-01-01|publisher=National Academies|isbn=978-0-309-02746-5|page=786 }}</ref>
-Thawing permafrost represents a threat to industrial infrastructure. In May 2020 thawing permafrost at Norilsk-Taimyr Energy's Thermal Power Plant No. 3 caused an oil storage tank to collapse, spilling 6,000 tonnes of diesel into the land, 15,000 into the water. The rivers [[Ambarnaya]], [[Daldykan]] and many smaller rivers were polluted. The pollution reached the lake [[Pyasino]] that is important to the water supply of the entire [[Taimyr Peninsula]]. [[State of emergency]] at the federal level was declared. Many buildings and infrastructure are built on permafrost, which cover 65% of Russian territory, and all those can be damaged as it thaws. <ref name=TASS>{{cite news |title=Diesel fuel spill in Norilsk in Russia's Arctic contained |url=https://tass.com/emergencies/1164423 |access-date=7 June 2020 |work=[[TASS]] |date=5 June 2020 |location=Moscow, Russia}}</ref><ref name=ft>{{citation |url=https://www.ft.com/content/fa9c20a0-2dad-4992-9686-0ec98b44faa8 |archive-url=https://ghostarchive.org/archive/20221210/https://www.ft.com/content/fa9c20a0-2dad-4992-9686-0ec98b44faa8 |archive-date=10 December 2022 |url-access=subscription |title=Siberia fuel spill threatens Moscow's Arctic ambitions |author=Max Seddon |work=[[Financial Times]] |date=4 June 2020}}</ref> The [[2020 Norilsk oil spill]] has been described as the second-largest oil spill in modern Russian history.<ref name=nyt>{{citation |url=https://www.nytimes.com/2020/06/04/world/europe/russia-oil-spill-arctic.html |title=Russia Declares Emergency After Arctic Oil Spill |author=Ivan Nechepurenko |work=[[New York Times]] |date=5 June 2020}}</ref> The thawing can also cause leakage of toxic elements from sites of buried toxic waste.<ref name="nyt" /><ref>{{cite news |last1=ANTONOVA |first1=MARIA |title=Russia Says Melting Permafrost Is Behind The Massive Arctic Fuel Spill |url=https://www.sciencealert.com/russia-claims-melting-permafrost-is-behind-the-massive-arctic-fuel-spill |access-date=19 July 2020 |agency=Science Daily |date=5 June 2020}}</ref>
-It's been estimated that nearly 70% of infrastructure located in the permafrost areas is at risk by 2050, while the associated costs could rise to tens of billions of dollars in the second half of the century. <ref name="Hjort2022">{{Cite journal |last1=Hjort |first1=Jan |last2=Streletskiy |first2=Dmitry |last3=Doré |first3=Guy |last4=Wu |first4=Qingbai |last5=Bjella |first5=Kevin |last6=Luoto |first6=Miska |date=11 January 2022 |title=Impacts of permafrost degradation on infrastructure |journal=Nature Reviews Earth & Environment |volume=3 |pages=24–38 |doi=10.1029/2022JG006956}}</ref>
-{{Clear}}
-<gallery mode="packed" heights="150px">
-File:PICT4417Sykhus.JPG|Modern buildings in permafrost zones may be built on piles to avoid permafrost-thaw foundation failure from the heat of the building.
-File:Trans-Alaska Pipeline (1).jpg|[[Heat pipe#Permafrost cooling|Heat pipes in vertical supports]] maintain a frozen bulb around portions of the [[Trans-Alaska Pipeline]] that are at risk of thawing.
-File:Yakoutsk Construction d'immeuble.jpg|Pile foundations in [[Yakutsk]], a city underlain with continuous permafrost.
-File:Raised pipes in permafrost.jpg|[[District heating]] pipes run above ground in Yakutsk to avoid thawing permafrost.
 </gallery>