Climate change in Antarctica explained

Climate change caused by greenhouse gas emissions from human activities occurs everywhere on Earth, and while Antarctica is less vulnerable to it than any other continent, climate change in Antarctica has been observed. Since 1959, there has been an average temperature increase of >0.05 °C/decade since 1957 across the continent, although it had been uneven. West Antarctica warmed by over 0.1 °C/decade from the 1950s to the 2000s, and the exposed Antarctic Peninsula has warmed by 3C-change since the mid-20th century. The colder, stabler East Antarctica had been experiencing cooling until the 2000s. Around Antarctica, the Southern Ocean has absorbed more oceanic heat than any other ocean, and has seen strong warming at depths below . Around the West Antarctic, the ocean has warmed by 1C-change since 1955.

The warming of the Southern Ocean around Antarctica has caused the weakening or collapse of ice shelves, which float just offshore of glaciers and stabilize them. Many coastal glaciers have been losing mass and retreating, causing net-annual ice loss across Antarctica, although the East Antarctic ice sheet continues to gain ice inland. By 2100, net ice loss from Antarctica is expected to add about 11round=5NaNround=5 to global sea level rise. Marine ice sheet instability may cause West Antarctica to contribute tens of centimeters more if it is triggered before 2100. With higher warming, instability would be much more likely, and could double global, 21st-century sea-level rise.

The fresh, 1100-1500 billion tons (GT) per year of meltwater from the ice dilutes the saline Antarctic bottom water, weakening the lower cell of the Southern Ocean overturning circulation (SOOC). According to some research, a full collapse of the SOOC may occur a between 1.7C-change and 3C-change of global warming, although the full effects are expected to occur over multiple centuries; these include less precipitation in the Southern Hemisphere but more in the Northern Hemisphere, an eventual decline of fisheries in the Southern Ocean and a potential collapse of certain marine ecosystems. While many Antarctic species remain undiscovered, there are documented increases in Antarctic flora,[1] and large fauna such as penguins are already having difficulty retaining suitable habitat. On ice-free land, permafrost thaws release greenhouse gases and formerly frozen pollution.

The West Antarctic ice sheet is likely to completely melt unless temperatures are reduced by 2C-change below 2020 levels. The loss of this ice sheet would take between 2,000 and 13,000 years, although several centuries of high greenhouse emissions could shorten this time to 500 years. A sea-level rise of 3.3m (10.8feet) would occur if the ice sheet collapses, leaving ice caps on the mountains, and 4.3m (14.1feet) if those ice caps also melt. Isostatic rebound may contribute an additional 1m (03feet) to global sea levels over another 1,000 years. The far-stabler East Antarctic ice sheet may only cause a sea-level rise of 0.5m (01.6feet) – 0.9m (03feet) from the current level of warming, a small fraction of the 53.3m (174.9feet) contained in the full ice sheet. With global warming of around 3C-change, vulnerable areas like Wilkes Basin and Aurora Basin may collapse over around 2,000 years, potentially adding up to 6.4m (21feet) to sea levels. The complete melting and disappearance of the East Antarctic ice sheet would require at least 10,000 years and would only occur if global warming reaches 5C-change to 10C-change.

Temperature and weather changes

Antarctica is the coldest, driest continent on Earth, and has the highest average elevation.[2] Antarctica's dryness means the air contains little water vapor and conducts heat poorly. The Southern Ocean surrounding the continent is far more effective at absorbing heat than any other ocean. The presence of extensive, year-around sea ice, which has a high albedo (reflectivity), adds to the albedo of the ice sheets' own bright, white surface. Antarctica's coldness means it is the only place on Earth where an atmospheric temperature inversion occurs every winter; elsewhere on Earth, the atmosphere is at its warmest near the surface and becomes cooler as elevation increases. During the Antarctic winter, the surface of central Antarctica becomes cooler than middle layers of the atmosphere; this means greenhouse gases trap heat in the middle atmosphere, and reduce its flow toward the surface and toward space, rather than preventing the flow of heat from the lower atmosphere to the upper layers. This effect lasts until the end of the Antarctic winter.[3] Early climate models predicted temperature trends over Antarctica would emerge more slowly and be more subtle than those elsewhere.[4]

There were fewer than twenty permanent weather stations across the continent and only two in the continent's interior. Automatic weather stations were deployed relatively late, and their observational record was brief for much of the 20th century satellite temperature measurements began in 1981 and are typically limited to cloud-free conditions. Thus, datasets representing the entire continent only began to appear by the very end of the 20th century.[5] The exception was the Antarctic Peninsula, where warming was pronounced and well-documented;[6] it was eventually found to have warmed by 3C-change since the mid 20th century. Based on this limited data, several papers published in the early 2000s said there had been an overall cooling over continental Antarctica outside the Peninsula.[7] [8]

A 2002 analysis led by Peter Doran received widespread media coverage after it also indicated stronger cooling than warming between 1966 and 2000, and found the McMurdo Dry Valleys in East Antarctica had experienced cooling of 0.7 °C per decade, a local trend that was confirmed by subsequent research at McMurdo.[9] Multiple journalists said these findings were "contradictory" to global warming,[10] [11] [12] [13] [14] [15] even though the paper noted the limited data and found warming over 42% of the continent.[16] [17] [18] What became known as the Antarctic Cooling Controversy received further attention in 2004, when Michael Crichton wrote that novel State of Fear, which said a conspiracy among climate scientists to make up global warming, and said Doran's study definitively proved there was no warming in Antarctica outside of the Peninsula.[19] Relatively few scientists responded to the book at the time,[20] but it was mentioned in a 2006 US Senate hearing in support of climate change denial.[21] Peter Doran published a statement in The New York Times decrying the misinterpretation of his work.[17] The British Antarctic Survey and NASA also issued statements affirming the strength of climate science after the hearing.[22] [23]

By 2009, researchers were able to combine historical weather-station data with satellite measurements to create consistent temperature records going back to 1957 that demonstrated warming of >0.05 °C/decade since 1957 across the continent, with cooling in East Antarctica offset by the average temperature increase of at least 0.176 ± 0.06 °C per decade in West Antarctica.[24] [25] Subsequent research confirmed clear warming over West Antarctica in the 20th century, with the only uncertainty being the magnitude.[26] During 2012-2013, estimates based on WAIS Divide ice cores and revised temperature records from Byrd Station suggested a much-larger West-Antarctica warming of since 1958, or around per decade,[27] [28] [29] [30] although there has been uncertainty about it.[31] In 2022, a study narrowed the warming of the Central area of the West Antarctic Ice Sheet between 1959 and 2000 to per decade, and conclusively attributed it to increases in greenhouse gas concentrations caused by human activity.[32]

Between 2000 and 2020, local changes in atmospheric circulation patterns like the Interdecadal Pacific Oscillation (IPO) and the Southern Annular Mode (SAM) slowed or partially reversed the warming of West Antarctica, with the Antarctic Peninsula experiencing cooling from 2002.[33] [34] [35]

While a variability in those patterns is natural, ozone depletion had also led the SAM to be stronger than it had been in the past 600 years of observations. Studies predicted a reversal in the SAM once the ozone layer began to recover following the Montreal Protocol, starting from 2002,[36] [37] [38] and these changes are consistent with their predictions.[39] As these patterns reversed, the East Antarctica interior demonstrated clear warming over those two decades.[40] [41] In particular, the South Pole warmed by 0.61 ± 0.34 °C per decade between 1990 and 2020, which is three times the global average.[42] [43] The Antarctica-wide warming trend continued after 2000, and in February 2020, the continent recorded its highest temperature of 18.3 °C, which is one degree higher than the previous record of 17.5 °C in March 2015.[44]

Models predict under the most intense climate change scenario, known as RCP8.5, Antarctic temperatures will rise by 4C-change on average by 2100; this rise will be accompanied by a 30% increase in precipitation and a 30% decrease in sea ice.[45] RCPs were developed in the late 2000s, and early 2020s research considers RCP8.5 much less likely[46] than the more-moderate scenarios like RCP 4.5, which lie in between the worst-case scenario and the Paris Agreement goals.[47] [48]

Effects on ocean currents

See main article: Southern Ocean overturning circulation.

See also: Effects of climate change on oceans.

Between 1971 and 2018, over 90% of thermal energy from global heating entered the oceans.[49] The Southern Ocean absorbs the most heat; after 2005, it accounted for between 67% and 98% of all heat entering the oceans. The temperature in the ocean's upper layer in West Antarctica has warmed by 1C-change since 1955, and the Antarctic Circumpolar Current (ACC) is also warming faster than the average.[50] It is also a highly important carbon sink.[51] [52] These properties are connected to the Southern Ocean overturning circulation (SOOC), one half of the global thermohaline circulation. It is important estimates on when global warming will reach 2C-change – inevitable in all scenarios where greenhouse gas emissions have not been significantly lowered – depend on the strength of the circulation more than any factor other than the overall emissions.

The overturning circulation has two parts; the smaller upper cell, which is most-strongly affected by winds and precipitation, and the larger lower cell that is defined by the temperature and salinity of Antarctic bottom water.[53] Since the 1970s, the upper cell has strengthened by 50-60% while the lower cell has weakened by 10-20%. Some of this was due to the natural cycle of Interdecadal Pacific Oscillation (IPO) but there is a clear effect of climate change,[54] [55] because it alters winds and precipitation through shifts in the Southern Annular Mode (SAM) pattern.[56] Fresh meltwater from the erosion of the West Antarctic ice sheet dilutes the more-saline Antarctic bottom water,[57] [58] which flows at a rate of 1100-1500 billion tons (GT) per year. During the 2010s, a temporary reduction in ice-shelf melting in West Antarctica allowed for the partial recovery of Antarctic bottom water and the lower cell of the circulation.[59] Greater melting and further decline of the circulation is expected in the future.

As bottom water weakens while the flow of warmer, fresher waters strengthens near the surface, the surface waters become more buoyant, and less likely to sink and mix with the lower layers, increasing ocean stratification.[60] [61] [62] One study says the strength of the circulation would halve by 2050 under the worst climate-change scenario,[63] with greater losses occurring afterwards.[64] Paleoclimate evidence shows the entire circulation has significantly weakened or completely collapsed in the past; preliminary research says such a collapse may become likely once global warming reaches between 1.7C-change and 3C-change, but this estimate is much-less certain than for the majority of tipping points in the climate system.[65] Such a collapse would be prolonged; one estimate says it would occur before 2300.[66] As with the better-studied Atlantic meridional overturning circulation (AMOC), a major slowing or collapse of the SOOC would have substantial regional and global effects. Some likely effects include a decline in precipitation in Southern Hemisphere countries like Australia, a corresponding increase in precipitation in the Northern Hemisphere, and an eventual decline of fisheries in the Southern Ocean, which could lead to a potential collapse of some marine ecosystems. These effects are expected to occur over centuries, but there has been limited research to date and few specifics are currently known.

Effects on the cryosphere

Observed changes in ice mass

Contrasting temperature trends across parts of Antarctica mean some locations, particularly at the coasts, lose mass while locations further inland continue to gain mass. These contrasting trends and the remoteness of the region make estimating an average trend difficult.[67] In 2018, a systematic review of all previous studies and data by the Ice Sheet Mass Balance Inter-comparison Exercise (IMBIE) estimated an increase in the West Antarctic ice sheet from 53 ± 29 Gt (gigatonnes) in 1992 to 159 ± 26 Gt in the final five years of the study. On the Antarctic Peninsula, the study estimated a loss of 20 ± 15 Gt per year with an increase in loss of roughly 15 Gt per year after 2000, a significant quantity of which was the loss of ice shelves.[68] The review's overall estimate was that Antarctica lost 2,720 ± 1,390 gigatons of ice from 1992 to 2017, averaging 109 ± 56 Gt per year. This would amount to of sea-level rise. A 2021 analysis of data from four research satellite systems – Envisat, European Remote-Sensing Satellite, GRACE and GRACE-FO, and ICESat – indicated an annual mass loss of about 12 Gt from 2012 to 2016 due to much-greater ice gain in East Antarctica than earlier estimated, which offset most of the losses from West Antarctica.[69] The East Antarctic ice sheet can still gain mass despite warming because effects of climate change on the water cycle increase precipitation over its surface, which then freezes and helps to accrete more ice.

Black carbon pollution

Black carbon from incomplete fuel combustion is carried long distances by wind. If it reaches Antarctica, black carbon accumulates on snow and ice, reducing the reflectivity and causing it to absorb more energy. This accelerates melting and can create an ice-albedo feedback loop in which meltwater itself absorbs more heat from sunlight.[70] Due to its remoteness, Antarctica has the cleanest snow in the world, and some research says the effects of black carbon across West and East Antarctica is minimal with an albedo reduction of about 0.5% in one 47-year ice core.[71] [72]

The highest concentrations of black carbon are found on the Antarctic Peninsula, where human activity is higher than elsewhere.[73] [74] Black carbon deposits near common tourist sites and research stations increase summer seasonal melting by between about of snow per m2.[74]

21st-century ice loss and sea-level rise

By 2100, net ice loss from Antarctica is expected to add about to global sea-level rise. Other processes may cause West Antarctica to contribute more to sea-level rise. Marine ice-sheet instability is the potential for warm water currents to enter between the seafloor and the base of the ice sheet once the sheet is no longer heavy enough to displace such flows.[75] Marine ice-cliff instability may cause ice cliffs taller than 100round=5NaNround=5 to collapse under their own weight once they are no longer buttressed by ice shelves. This process has never been observed and it only occurs in some models.[76] By 2100, these processes may increase sea-level rise caused by Antarctica to 410NaN0 under the low-emission scenario and by 570NaN0 under the high-emission scenario.

Some scientists have given greater estimates but all agree melting in Antarctica would have a greater impact and would be much more likely to occur under higher warming scenarios, where it may double the overall 21st-century sea-level rise to 20NaN0 or more.[77] [78] [79] According to one study, if the Paris Agreement is followed and global warming is limited to 2C-change, the loss of ice in Antarctica will continue at the 2020 rate for the rest of the 21st century, but if a trajectory leading to 3C-change is followed, Antarctica ice loss will accelerate after 2060 and start adding per year to global sea levels by 2100.[80]

Long-term sea level rise

Sea levels will continue to rise long after 2100 but potentially at very different rates. According to the most-recent reports of the Intergovernmental Panel on Climate Change (SROCC and the IPCC Sixth Assessment Report), there will be a median rise of and maximum rise of under the low-emission scenario. The highest-emission scenario results in a median rise of with a minimum of and a maximum of .[81]

Over longer timescales, the West Antarctic ice sheet, which is much smaller than the East Antarctic ice sheet and is grounded deep below sea level, is considered highly vulnerable. The melting of all of the ice in West Antarctica would increase global sea-level rise to .[82] Mountain ice caps that are not in contact with water are less vulnerable than the majority of the ice sheet, which is located below sea level. The collapse of the West Antarctic ice sheet would cause around of sea-level rise.[83] This kind of collapse is now considered almost inevitable because it appears to have occurred during the Eemian period 125,000 years ago, when temperatures were similar to those in the early 21st century.[84] [85] [86] [87] [88] The Amundsen Sea also appears to be warming at rates that, if continued, make the ice sheet's collapse inevitable.[89] [90]

The only way to reverse ice loss from West Antarctica once triggered is to lower the global temperature to 1C-change below the pre-industrial level, to 2C-change below the temperature of 2020.[91] Other researchers said a climate engineering intervention to stabilize the ice sheet's glaciers may delay its loss by centuries and give the environment more time to adapt. This is an uncertain proposal and would be one of the most-expensive projects ever attempted.[92] [93] Otherwise, the disappearance of the West Antarctic ice sheet would take an estimated 2,000 years. The loss of West Antarctica ice would take at least 500 years and possibly as long as 13,000 years.[94] [95] Once the ice sheet is lost, the isostatic rebound of the land previously covered by the ice sheet would result in an additional 1m (03feet) of sea-level rise over the following 1,000 years.

The East Antarctic ice sheet is far more stable than the West Antarctic ice sheet. The loss of the entire East Antarctic ice sheet would require global warming of between 5C-change and 10C-change, and a minimum of 10,000 years. Some of its parts, such as Totten Glacier and Wilkes Basin, are in vulnerable subglacial basins that lie below sea level. Estimates suggest the irreversible loss of those basins would begin once global warming reaches 3C-change, although this loss may become irreversible at warming of between 2C-change and 6C-change. After global warming reaches the critical threshold for the collapse of these subglacial basins, their loss will likely occur over around 2,000 years, although the loss may be as fast as 500 years or as slow as 10,000 years.

The loss of all of this ice would add between and to sea levels, depending on the ice sheet model used. Isostatic rebound of the newly ice-free land would add between 8cm (03inches) and 57cm (22inches).[96] Evidence from the Pleistocene shows partial loss can occur at lower warming levels; Wilkes Basin is estimated to have lost enough ice to add to sea levels between 115,000 and 129,000 years ago during the Eemian, and about between 318,000 and 339,000 years ago during Marine Isotope Stage 9.[97]

Permafrost thaw

Antarctica has much less permafrost than the Arctic. Antarctic permafrost is subject to thaw. The permafrost in Antarctica traps various compounds, including persistent organic pollutants (POPs) like polycyclic aromatic hydrocarbons, many of which are known carcinogens or can cause liver damage;[98] and polychlorinated biphenyls such as hexachlorobenzene (HCB) and DDT, which are associated with decreased reproductive success and immunohematological disorders.[99] Antarctic soils also contain heavy metals, including mercury, lead and cadmium, all of which can cause endocrine disruption, DNA damage, immunotoxicity and reproductive toxicity.[100] These compounds are released when contaminated permafrost thaws; this can change the chemistry of surface water. Bioaccumulation and biomagnification spread these compounds throughout the food web.[101] Permafrost thaw also results in greenhouse gas emissions, though the limited volume of Antarctic permafrost relative to Arctic permafrost means Antarctic permafrost is not considered a significant cause of climate change.

Ecological effects

See also: Wildlife of Antarctica.

Marine ecosystems

Nearly all of the species in Antarctic are marine; by 2015, 8,354 species had been discovered in Antarctica and taxonomically accepted; of these species, only 57 were not marine.[102] Antarctica may have up to 17,000 species;[103] while 90% of the ocean around Antarctica is deeper than, only 30% of the benthic-sample locations were taken at that depth.[104] On the Antarctic continental shelves, bethnic-zone biomass may increase due to oceanic warming, which is likely to be of most benefit to seaweed. Around 12% of the native benthic species may be outcompeted and go extinct. These estimates are preliminary; the vulnerabilities of most Antarctic species have yet to be assessed.[105]

Unlike the Arctic, there has been little change in marine primary production across the Southern Ocean in the available observations.[106] Estimates say an increase in Southern Ocean primary production could occur after 2100; this increase would block many nutrients from travelling to other oceans, leading to decreased production elsewhere. Some microbial communities appear to have been negatively affected by ocean acidification and there is a risk future acidification would threaten the eggs of pteropods, a type of zooplankton.

Antarctic krill are a key species in the Antarctic food web; they feed on phytoplankton, and are the main food for fish and penguins.[107] Krill are likely to abandon the fastest-warming areas, such as the Weddell Sea, while icefish may find shelf waters around Antarctic islands unsuitable. The shifts or declines in krill and copepod numbers are known to prevent the recovery in numbers of baleen whale following the declines caused by historical whaling. Without a reversal in temperature increases, baleen whales are likely to be forced to adapt their migratory patterns or face local extinction.[108] Many other marine species are expected to move into Antarctic waters as the oceans continue to warm, forcing native species to compete with them.[109] Some research says at 3C-change of warming, the diversity of Antarctic species would decline by nearly 17% and the suitable climate area would shrink by 50%.[110]

Penguins

Penguins are the highest species in the Antarctic food web and are already being substantially affected by climate change. Numbers of Adélie penguins, chinstrap penguins, emperor penguin and king penguins have already been declining, while the number of gentoo penguins has increased. Gentoo penguins, which are ice intolerant and use mosses as nesting material, have been able to spread into previously inaccessible territories and substantially increase in number.[111] The vulnerable penguin species can respond through acclimatization, adaptation, or range shift.[112] Range shift through dispersal leads to colonization elsewhere but results in local extinction.[113]

Climate change is particularly threatening to penguins. As early as 2008, it was estimated every Southern Ocean temperature increase of 0.26C-change reduces king penguin populations by nine percent.[114] Under the worst-case warming scenario, king penguins will permanently lose at least two of their current eight breeding sites, and 70% of the species (1.1 million pairs) will have to relocate to avoid extinction.[115] [116] Emperor penguin populations may be at a similar risk; with no climate mitigation, 80% of populations are at risk of extinction by 2100. With Paris-Agreement temperature goals in place, that number may fall to 31% under the 2C-change goal, and to 19% under the 1.5C-change goal.[117]

A 27-year study of the largest colony of Magellanic penguins that was published in 2014 found extreme weather caused by climate change kills seven percent of penguin chicks in an average year, accounting for up to 50% of all chick deaths in some years.[118] [119] Since 1987, the number of breeding pairs in the colony has fallen by 24%.[119] Chinstrap penguins are also in decline, mainly due to a corresponding decline of Antarctic krill.[120] It is estimated while Adélie penguins will retain some habitat past 2099, one-third of colonies along the West Antarctic Peninsula – around 20% of the species – will be in decline by 2060.[121]

Terrestrial ecosystems

On the Antarctic continent, plants are mainly found in coastal areas; the commonest plants are lichens, followed by mosses and ice algae. In the Antarctic Peninsula, green snow algae have a combined biomass of around .[122] As glaciers retreat, they expose areas that often become colonized by pioneer lichen species.[123] The reduction in precipitation in East Antarctica had turned many green mosses from green to red or brown as they respond to this drought. Schistidium antarctici had declined, while the desiccation-tolerant species Bryum pseudotriquetrum and Ceratodon purpureus have increased.[124] The Antarctic ozone hole has led to an increase in UV-B radiation, which also causes observed damage to plant cells and photosynthesis.

The only vascular plants on continental Antarctica are Deschampsia antarctica and Colobanthus quitensis, which are found on the Antarctic Peninsula.[125] Increased temperatures have boosted photosynthesis and allowed these species to increase their population and range.[126] Other plant species are increasingly likely to spread to Antarctica as the climate continues to warm and as human activity on the continent increases.

Effects of human development

Tourism in Antarctica has significantly increased since 2020; 74,400 tourists arrived there in late 2019 and early 2020.[74] [127] The development of Antarctica for the purposes of industry, tourism, and an increase in research facilities may put pressure on the continent and threaten its status as largely untouched land.[128] Regulated tourism in Antarctica brings about awareness, and encourages the investment and public support needed to preserve Antarctica's distinctive environment.[129] An unmitigated loss of ice on land and sea could greatly reduce its attractiveness.[130]

Policy can be used to increase climate-change resilience through the protection of ecosystems. Ships that operate in Antarctic waters adhere to the international Polar Code, which includes regulations and safety measures such as operational training and assessments, the control of oil discharge, appropriate sewage disposal, and the prevention of pollution by toxic liquids.[131] Antarctic Specially Protected Areas (ASPA) and Antarctic Specially Managed Areas (ASMA) are designated by the Antarctic Treaty to protect flora and fauna.[132] Both ASPAs and ASMAs restrict entry but to different extents, with ASPAs being the highest level of protection. Designation of ASPAs has decreased 84% since the 1980s despite a rapid increase in tourism, which may bring additional stressors to the natural environment and ecosystems. To alleviate stress on Antarctic ecosystems posed by climate change and the rapid increase in tourism, much of the scientific community advocates for an increase in protected areas like ASPAs to improve Antarctica's resilience to rising temperatures.

See also

Notes and References

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