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Lake Vostok

Coordinates: 77°30′S 106°00′E / 77.500°S 106.000°E / -77.500; 106.000
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Lake Vostok
Russian: озеро Восток
Radar satellite image of Lake Vostok
Location of Lake Vostok in Antarctica.
Location of Lake Vostok in Antarctica.
Lake Vostok
Coordinates77°30′S 106°00′E / 77.500°S 106.000°E / -77.500; 106.000
Lake typeAncient lake, Subglacial rift lake
Basin countriesAntarctica
Max. length250 km (160 mi)[1]
Max. width50 km (30 mi)[1]
Surface area12,500 km2 (4,830 sq mi)
Average depth432 m (1,417 ft)
Max. depth510 m (1,700 ft)[1] to 900 m (3,000 ft)[2]
Water volume5,400 km3 (1,300 cu mi)[2] ± 1,600 km3 (400 cu mi)
Residence time13,300 yrs
Surface elevationc. −500 m (−1,600 ft)
Islands1
SettlementsVostok Station

Lake Vostok (Russian: озеро Восток, romanized: ozero Vostok) is the largest of Antarctica's 675 known[3] subglacial lakes. Lake Vostok is located at the southern Pole of Cold, beneath Russia's Vostok Station under the surface of the central East Antarctic Ice Sheet, which is at 3,488 m (11,444 ft) above mean sea level. The surface of this fresh water lake is approximately 4,000 m (13,100 ft) under the surface of the ice, which places it at approximately 500 m (1,600 ft) below sea level.

Measuring 250 km (160 mi) long by 50 km (30 mi) wide at its widest point,[1] it covers an area of 12,500 km2 (4,830 sq mi) making it the 16th largest lake by surface area. With an average depth of 432 m (1,417 ft), it has an estimated volume of 5,400 km3 (1,300 cu mi),[2] making it the 6th largest lake by volume.

The lake is divided into two deep basins by a ridge. The liquid water depth over the ridge is about 200 m (700 ft), compared to roughly 400 m (1,300 ft) deep in the northern basin and 800 m (2,600 ft) deep in the southern.

The lake is named after Vostok Station, which in turn is named after the Vostok (Восток), a sloop-of-war, which means "East" in Russian.[4] The existence of a subglacial lake in the Vostok region was first suggested by Russian geographer Andrey Kapitsa based on seismic soundings made during the Soviet Antarctic Expeditions in 1959 and 1964 to measure the thickness of the ice sheet.[5][6] The continued research by Russian and British scientists[6][7] led to the final confirmation of the existence of the lake in 1993 by J. P. Ridley using ERS-1 laser altimetry.[5]

The overlying ice provides a continuous paleoclimatic record of 400,000 years, although the lake water itself may have been isolated for 15[8][9] to 25 million years.[10] On 5 February 2012, a team of Russian scientists completed the longest ever ice core of 3,768 m (12,400 ft) and pierced the ice shield to the surface of the lake.[11]

The first core of freshly frozen lake ice was obtained on 10 January 2013 at a depth of 3,406 m (11,175 ft).[12] However, as soon as the ice was pierced, water from the underlying lake gushed up the borehole, mixing it with the Freon and kerosene used to keep the borehole from freezing.[13][14] A new borehole was drilled and an allegedly pristine water sample was obtained in January 2015.[citation needed] The Russian team plans to eventually lower a probe into the lake to collect water samples and sediments from the bottom. It is hypothesized that unusual forms of life could be found in the lake's liquid layer, a fossil water reserve. Because Lake Vostok may contain an environment sealed off below the ice for millions of years, the conditions could resemble those of ice-covered oceans hypothesized to exist on Jupiter's moon Europa,[13][15] and Saturn's moon Enceladus.[16]

Discovery

[edit]
Location of Lake Vostok in East Antarctica

Russian scientist Peter Kropotkin first proposed the idea of fresh water under Antarctic ice sheets at the end of the 19th century.[17] He theorized that the tremendous pressure exerted by the cumulative mass of thousands of vertical meters of ice could decrease the melting point at the lowest portions of the ice sheet to the point where the ice would become liquid water. Kropotkin's theory was further developed by Russian glaciologist Igor Zotikov, who wrote his PhD thesis on this subject in 1967.[5]

Russian geographer Andrey Kapitsa used seismic soundings in the region of Vostok Station made during the Soviet Antarctic Expedition in 1959 and 1964 to measure the thickness of the ice sheet.[5] Kapitsa was the first to suggest the existence of a subglacial lake in the region,[6] and the subsequent research confirmed his hypothesis.[18]

When British scientists in Antarctica performed airborne ice-penetrating radar surveys in the early 1970s, they detected unusual radar readings at the site which suggested the presence of a liquid freshwater lake below the ice.[19] In 1991, Jeff Ridley, a remote sensing specialist with the Mullard Space Science Laboratory at University College London, directed the ERS-1 satellite to turn its high-frequency array toward the center of the Antarctic ice cap. The data from ERS-1 confirmed the findings from the 1973 British surveys,[20] but these new data were not published in the Journal of Glaciology until 1993. Space-based radar revealed that this subglacial body of fresh water is one of the largest lakes in the world, and one of some 140 subglacial lakes in Antarctica. Russian and British scientists delineated the lake in by integrating a variety of data, including airborne ice-penetrating radar imaging observations and space-based radar altimetry, and the discovery of the lake was published in the science journal Nature on 20 June 1996.[21] It has been confirmed that the lake contains large amounts of liquid water under the more than 3-kilometer-thick (1.9 mi) ice cap. The lake has at least 22 cavities of liquid water, averaging 10 kilometers (6 mi) each.[22]

The station after which the lake is named commemorates the Vostok (Восток), the 900-ton sloop-of-war ship sailed by one of the discoverers of Antarctica, Russian explorer Admiral Fabian von Bellingshausen.[4] Because the word Vostok means "East" in Russian, the names of the station and lake also reflect the fact that they are located in East Antarctica.

In 2005 an island was found in the central part of the lake.[23] Then, in January 2006, the discovery of two nearby smaller lakes under the ice cap was published; they are named 90 Degrees East and Sovetskaya.[24] It is suspected that these Antarctic subglacial lakes may be connected by a network of subglacial rivers. Centre for Polar Observation & Modelling glaciologists propose that many of the subglacial lakes of Antarctica are at least temporarily interconnected.[25] Because of varying water pressure in individual lakes, large subsurface rivers may suddenly form and then force large amounts of water through the solid ice.[25]

Geological history

[edit]
Further information: Geology of Antarctica and Gondwana

Africa separated from Antarctica around 160 million years ago, followed by the Indian subcontinent, in the early Cretaceous (about 125 million years ago). About 66 million years ago, Antarctica (then connected to Australia) still had a tropical to subtropical climate, complete with marsupial fauna and an extensive temperate rainforest.[26][27]

The Lake Vostok basin is a small (50-kilometer-wide (31 mi)) tectonic feature within the overall setting of a several-hundred-kilometer-wide continental collision zone between the Gamburtsev Mountain Range, a subglacial mountain range and the Dome C region.[28] The lake water is cradled on a bed of sediments 70 meters (230 ft) thick, offering the possibility that they contain a unique record of the climate and life in Antarctica before the ice cap formed.[20][29]

Traits

[edit]
Vostok Station

The lake water is estimated to have been sealed off under the thick ice sheet about 15 million years ago.[8] Initially, it was thought that the same water had made up the lake since the time of its formation, giving a residence time in the order of one million years.[25] Later research by Robin Bell and Michael Studinger from the Lamont–Doherty Earth Observatory of Columbia University suggested that the water of the lake is continually freezing and being carried away by the motion of the Antarctic ice sheet, while being replaced by water melting from other parts of the ice sheet in these high pressure conditions. This resulted in an estimate that the entire volume of the lake is replaced every 13,300 years – its effective mean residence time.[30]

The coldest naturally occurring temperature ever observed on Earth, −89 °C (−128 °F), was recorded at Vostok Station on 21 July 1983.[8] The average water temperature is calculated to be around −3 °C (27 °F); it remains liquid below the normal freezing point because of high pressure from the weight of the ice above it.[31] Geothermal heat from the Earth's interior may warm the bottom of the lake,[32][33][34] while the ice sheet itself insulates the lake from cold temperatures on the surface.

Lake Vostok is an oligotrophic extreme environment, one that is expected to be supersaturated with nitrogen and oxygen,[35][36] measuring 2.5 litres (0.088 cu ft) of nitrogen and oxygen per 1 kg (2.2 lb) of water,[37] that is 50 times higher than those typically found in ordinary freshwater lakes on Earth's surface. The sheer weight and pressure around 345 bars (5,000 psi) of the continental ice cap on top of Lake Vostok is estimated to contribute to the high gas concentration.[38]

Besides dissolving in the water, oxygen and other gases are trapped in a type of structure called a clathrate. In clathrate structures, gases are enclosed in an icy cage and look like packed snow. These structures form at the high-pressure depths of Lake Vostok and would become unstable if brought to the surface.[25][37]

In April 2005, German, Russian, and Japanese researchers found that the lake has tides.[39] Depending on the position of the Sun and the Moon, the surface of the lake rises about 12 mm (0.47 in).[40] The lake is under complete darkness, under 355 bar (5,150 psi) of pressure, and expected to be rich in oxygen, so there is speculation that any organisms inhabiting the lake could have evolved in a manner unique to this environment.[20][37] There is a 1 microtesla magnetic anomaly on the east coast of the lake, spanning 105 by 75 km (65 by 47 mi). Researchers hypothesize that the anomaly may be caused by a thinning of the Earth's crust in that location.[41]

Living Hydrogenophilus thermoluteolus micro-organisms have been found in Lake Vostok's deep ice core drillings; they are an extant surface-dwelling species.[36][42] This suggests the presence of a deep biosphere utilizing a geothermal system of the bedrock encircling the subglacial lake. There is optimism that microbial life in the lake may be possible despite high pressure, constant cold, low nutrient input, potentially high oxygen concentration and an absence of sunlight.[36][43] Jupiter's moon Europa and Saturn's moon Enceladus may also harbor lakes or oceans below a thick crust of ice. Any confirmation of life in Lake Vostok could strengthen the prospect for the presence of life on icy moons.[36][44]

Research

[edit]
Ice cores drilled at Vostok Station, which is seen in the background

Researchers working at Vostok Station produced one of the world's longest ice cores in 1998. A joint Russian, French, and United States team drilled and analyzed the core, which is 3,623 m (11,886 ft) long. Ice samples from cores drilled close to the top of the lake have been assessed to be as old as 420,000 years. The assumption is that the lake has been sealed from the surface since the ice sheet was formed 15 million years ago. Drilling of the core was deliberately halted roughly 100 m (300 ft)[45] above the suspected boundary between the ice sheet and the liquid waters of the lake. This was to prevent contamination of the lake with the 60-ton column of Freon and kerosene used to prevent the borehole from collapsing and freezing over.[20]

From this core, specifically from ice that is thought to have formed from lake water freezing onto the base of the ice sheet, extremophile microbes were found, suggesting that the lake water supports life. Scientists suggested that the lake could possess a unique habitat for ancient bacteria with an isolated microbial gene pool containing characteristics developed perhaps 500,000 years ago.[46]

An artist's cross-section of Lake Vostok's drilling

In January 2011, the head of the Russian Antarctic Expedition, Valery Lukin, announced that his team had only 50 m (200 ft) of ice left to drill in order to reach the water.[8] The researchers then switched to a new thermal drill head with a "clean" silicone oil fluid to drill the rest of the way.[47] Instead of drilling all the way into the water, they said they would stop just above it when a sensor on the thermal drill detected free water. At that point, the drill was to be stopped and extracted from the bore hole. Removal of the drill would lower the pressure beneath it, drawing water into the hole to be left to freeze, creating a plug of ice in the bottom of the hole.[48] Drilling stopped on 5 February 2011 at a depth of 3,720 m (12,200 ft) so that the research team could make it off the ice before the beginning of the Antarctic winter season. The drilling team left by aircraft on 6 February 2011.[49]

By plan, the following summer, the team was to drill down again to take a sample of that ice and analyze it.[8][50] The Russians resumed drilling into the lake in January 2012 and reached the upper surface of the water on 6 February 2012.[11][51] The researchers allowed the rushing lake water to freeze within the bore hole and months later; they collected ice core samples of this newly formed ice and sent them to the Laboratory for Glaciology and Environmental Geophysics in Grenoble, France, for analysis.[citation needed]

Biology results

[edit]

United Kingdom and United States

[edit]

Scientists first reported evidence of microbes in the accretion ice in 1999.[52][53] Since then, a different team led by Scott O. Rogers has been identifying a variety of bacteria and fungi from accretion ice (not from the subglacial water layer) collected during U.S. drilling projects in the 1990s.[54][55] According to him, this indicates that the lake below the ice is not sterile but contains a unique ecosystem. Then Scott Rogers published in July 2013 that his team performed nucleic acid (DNA and RNA) sequencing and the results allowed deduction of the metabolic pathways represented in the accretion ice and, by extension, in the lake. The team found 3,507 unique gene sequences, and approximately 94% of the sequences were from bacteria and 6% were from Eukarya.[56][57] Taxonomic classifications (to genus and/or species) or identification were possible for 1,623 of the sequences. In general, the taxa were similar to organisms previously described from lakes, brackish water, marine environments, soil, glaciers, ice, lake sediments, deep-sea sediments, deep-sea thermal vents, animals and plants. Sequences from aerobic, anaerobic, psychrophilic, thermophilic, halophilic, alkaliphilic, acidophilic, desiccation-resistant, autotrophic, and heterotrophic organisms were present, including a number from multicellular eukaryotes.[56]

In 2020, Colby Gura and Scott Rogers extended their study of Lake Vostok accretion ice, as well as the basal ice flowing into the lake.[58] They found that the basal ice contained an almost completely different community of organisms compared to those found in the lake accretion ice, indicating that they signified two completely different ecosystems. Additional bacteria and eukaryotes were reported. The highest diversity of organisms in the lake ice was significantly associated (p<0.05) with higher concentrations of ions and amino acids. While their previous work indicated the presence of bacteria that inhabit fish intestines, no sequences from fish were found. However, in the 2020 study, they found an rRNA sequence that was >97% similar to that from a rock cod common along the coast of Antarctica (Notothenia coriiceps). This is the first report of a fish species possibly residing in Lake Vostok. The fish is known to produce antifreeze proteins.

Microbiologist David Pearce of the University of Northumbria in Newcastle, UK, stated that the DNA could simply be contamination from the drilling process, and not representative of Lake Vostok itself. The old ice cores were drilled in the 1990s to look for evidence of past climates buried in the ice, rather than for life, so the drilling equipment was not sterilized.[14] Also Sergey Bulat, a Lake Vostok expert at the Petersburg Nuclear Physics Institute in Gatchina, Russia, doubts that any of the cells or DNA fragments in the samples would belong to organisms that might actually exist in the lake. He says that it is very probable that the samples are heavily contaminated with tissue and microbes from the outside world.[59]

The contamination possibility has been refuted by Scott Rogers, because the control measures were rigorous, and the combinations of organisms found in each of the ice samples were consistent with organisms living in a cold lake and ice (including a sequence from an Antarctic rock cod), and were inconsistent with contamination introduced while sampling or from the lab procedures. Also, all of the lab procedures were performed in parallel with ice samples from Lake Erie, and the two resulting data sets were completely different. The Lake Erie sample exhibited many signals of human habitation, while the Lake Vostok ice samples exhibited no signals of human habitation. The Lake Erie sample also had an almost completely different profile of bacterial and eukaryotic phyla.

Russia and France

[edit]

Russian and French scientists have been carrying out molecular DNA studies of the water from Lake Vostok that was frozen in the borehole, by constructing numerous DNA libraries,[citation needed] which are collections of fragments of DNA that allow scientists to identify which species of bacteria they may belong to. Samples taken from the lake so far contain about one part of kerosene per 1000 of water, and they are contaminated with bacteria previously present in the drill bit and the kerosene drilling fluid.[citation needed] So far, the scientists have been able to identify 255 contaminant species, but also have found an unknown bacterium when they initially drilled down to the lake's surface in 2012, with no matches in any international databases, and they hope it may be a unique inhabitant of Lake Vostok.[60][61] However, Vladimar Korolev, the laboratory head of the study at the same institution, said that the bacteria could in principle be a contaminant that uses kerosene—the antifreeze used during drilling—as an energy source.[62]

Critics from the scientific community state that no valuable information can be obtained until they can test clean samples of lake water, uncontaminated by drilling fluid.[citation needed] Regardless of the contamination issues, in May 2013 the drilling facility at the Russian Vostok Antarctic station was declared a historic monument as "the result of the recognition of the achievements of the Russian research of Antarctica by the international scientific community, and of the unique operations on opening the subglacial Lake Vostok performed by Russian scientists on February 5, 2012."[citation needed]

In January 2015, the Russian press stated that Russian scientists have made a new "clean" borehole into Lake Vostok using a special 50-kilogram probe that collected about 1 liter of water not adulterated by the antifreezing fluid.[63][64] The drilling technology used proved to be inappropriate to collect liquid water in general and clean samples in particular[65] and results were unreported.[66] It was predicted that the water would rise 30–40 m in the bottom part of the borehole, but in fact the water rose from the lake to a height of more than 500 m. In October of that same year, the work was suspended for that southern summer because of insufficient funding by the federal Russian government.[67][68]

In 2019 the Russian government ordered that a new wintering complex be installed at the Lake Vostok research station, funded in part by Russian billionaire Leonid Mikhelson. This complex will be capable of supporting 35 people in the summer, 15 in the winter and will have 4 diesel generators with a capacity of 200 kilowatts each. The new complex, consisting of 133 modules, was delivered to Progress Station in December 2021 and will be transported to the Lake Vostok research station and installed over the next four years.[69][70]

Contamination due to drilling fluids

[edit]

The drilling project has been opposed by some environmental groups and scientists who have argued that hot-water drilling would have a more limited environmental impact.[71] The main concern is that the lake could become contaminated with the antifreeze that the Russians used to keep the bore hole from refreezing. Scientists of the United States National Research Council have taken the position that it should be assumed that microbial life exists in Lake Vostok and that after such a long isolation, any life forms in the lake require strict protection from contamination.[72]

The original drilling technique employed by the Russians involved the use of Freon and kerosene to lubricate the borehole and prevent it from collapsing and freezing over; 60 short tons (54 t) of these chemicals have been used thus far on the ice above Lake Vostok.[20] Other countries, particularly the United States and Britain, have failed to persuade the Russians not to pierce to the lake until cleaner technologies such as hot-water drilling are available.[73] Though the Russians claim to have improved their operations, they continue to use the same borehole, which has already been contaminated with kerosene.[1] According to the head of Russian Antarctic Expeditions, Valery Lukin, new equipment was developed by researchers at the Petersburg Nuclear Physics Institute that would ensure the lake remains uncontaminated upon intrusion.[8] Lukin has repeatedly reassured other signatory nations to the Antarctic Treaty System that the drilling will not affect the lake, arguing that on breakthrough, water will rush up the borehole, freeze, and seal the other fluids out.[74]

Some environmentalist groups remain unconvinced by these arguments. The Antarctic and Southern Ocean Coalition has argued that this manner of drilling is a profoundly misguided step which endangers Lake Vostok and other subglacial lakes in Antarctica (which some scientists are convinced are inter-linked with Lake Vostok).[5] The coalition has asserted that "it would be far preferable to join with other countries to penetrate a smaller and more isolated lake before re-examining whether penetration of Lake Vostok is environmentally defensible. If we are wise, the Lake will be allowed to reveal its secrets in due course."[5]

Lukin claims that hot-water drilling is much more dangerous for the microbiotic fauna, as it would boil the living species, and disturb the entire structure of water layers of the lake.[75] Additionally, hot-water drilling would have required more power than the Russian expedition could have generated at their remote camp.[71] However, the water samples obtained by the Russian team were heavily contaminated with drilling fluid, so they reported in May 2017 that it was impossible at this time to obtain reliable data on the real chemical and biological composition of the lake water.[76]

See also

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References

[edit]
  1. ^ a b c d e "Antarctica's Lake Vostok Controversy". Antarctic and Southern Ocean Coalition. 2010. Archived from the original on 12 November 2013. Retrieved 10 February 2011.
  2. ^ a b c "Subglacial Lake Facts". Ldeo.columbia.edu. Archived from the original on 2 January 2012. Retrieved 7 February 2012.
  3. ^ Livingstone, S.J.; Li, Y.; Rutishauser, A.; Sanderson, R.J.; Winter, K.; Mikucki, J.A.; Björnsson, H.; Bowling, J.S.; Chu, W.; Dow, C.F.; Fricker, H.A. (February 2022). "Subglacial lakes and their changing role in a warming climate". Nature Reviews Earth & Environment. 3 (2): 106–124. Bibcode:2022NRvEE...3..106L. doi:10.1038/s43017-021-00246-9. hdl:10044/1/93683.
  4. ^ a b Dotan, Yossi (2007). Watercraft on World Coins: Europe, 1800-2005. The Alpha Press. p. 220. ISBN 978-1-898595-49-6. The 900-ton Vostok was built in 1818 at the Okhta Shipyard of Stoke and Kolodnin in St. Petersburg.
  5. ^ a b c d e f "Appeal to the Duma on Lake Vostok, Antarctica" (PDF). Antarctic and Southern Ocean Coalition. 14 April 2008. Archived from the original (PDF) on 4 March 2016. Retrieved 10 February 2011.
  6. ^ a b c Скончался первооткрыватель озера Восток в Антарктиде [Discoverer of the Lake Vostok in the Antarctica died] (in Russian). Lenta.ru. 3 March 2011.
  7. ^ "Умер ученый Андрей Капица, сделавший в Антарктиде одно из крупнейших открытий XX века" [The author of one of the greatest discoveries, Andrey Kapitsa, died] (in Russian). NEWSru.com. 3 August 2011. Retrieved 25 August 2012.
  8. ^ a b c d e f Moskvitch, K (27 January 2011). "Lake Vostok drilling in Antarctic 'running out of time'". BBC News. Retrieved 28 January 2011.
  9. ^ Casey Kazan (5 December 2007). "Secrets of Antarctica's 15-Million Year-Old Lake -A Galaxy Classic". The Daily Galaxy. Archived from the original on 16 March 2008. Retrieved 20 August 2012.
  10. ^ Studinger, M (2008). "Subglacial Lake Vostok". Columbia University. Retrieved 1 February 2011.
  11. ^ a b Marc Kaufman (6 February 2012). "Russians drill into previously untouched Lake Vostok below Antarctic glacier". The Washington Post. Retrieved 6 February 2012.
  12. ^ Amir Khan (15 January 2013). "Buried Lake Reached: Lake Vostok Water Retrieved After 14 Million Years". International Science Times. Archived from the original on 19 January 2013. Retrieved 22 January 2013.
  13. ^ a b Douglas Fox (February 2013). "Hidden Antarctic Lake Spills Its Secrets". Discover Magazine. Retrieved 19 February 2021.
  14. ^ a b Michael Marshall (8 July 2013). "Lake Vostok may boast a thriving ecosystem". New Scientist. Retrieved 10 July 2013.
  15. ^ "Europa: Ocean Moon". solarsystem.nasa.gov. NASA. Retrieved 19 February 2021.
  16. ^ "The Geysers of Enceladus - Will Saturn's Moon Reveal a "Second Genesis"?". The Daily Galaxy. 31 July 2014. Archived from the original on 17 November 2015. Retrieved 27 October 2015.
  17. ^ "Research on the Ice age", Notices of the Imperial Russian Geographical Society, 1876.
  18. ^ "Andrey Kapitsa dies in Moscow". Russian Geographical Society. 3 August 2011. Archived from the original on 2 December 2013. Retrieved 4 August 2011. In cooperation with other scientists, Andrey Kapitsa made one of the most remarkable geographical discoveries of the 20th century – a vast lake beneath the Antarctic ice, near the polar research station Vostok.
  19. ^ Oswald, GKA; Robin, G. de Q. (1973). "Lakes beneath the Antarctic Ice Sheet". Nature. 245 (5423): 251–4. Bibcode:1973Natur.245..251O. doi:10.1038/245251a0. S2CID 4271414.
  20. ^ a b c d e Morton, O (April 2000). "Ice Station Vostok". Wired. Retrieved 25 July 2020.
  21. ^ Kapitsa, A. P.; Ridley, J. K.; De q. Robin, G.; Siegert, M. J.; Zotikov, I. A. (20 June 1996). "A large deep freshwater lake beneath the ice of central East Antarctica". Nature. 381 (6584): 684–686. Bibcode:1996Natur.381..684K. doi:10.1038/381684a0. S2CID 4335254. Retrieved 7 February 2021.
  22. ^ Fütterer, Dieter; Kleinschmidt, Georg (2006). Antarctica: contributions to global Earth sciences: proceedings of the IX International Symposium of Antarctic Earth Sciences Potsdam, 2003. Birkhäuser. p. 138. ISBN 978-3-540-30673-3. Retrieved 15 May 2011.
  23. ^ Whitehouse, D (25 May 2005). "Russia to resume Vostok drilling". BBC News. Retrieved 28 January 2011.
  24. ^ Robin Bell and Michael Studinger, Geophysical researchers from Columbia University, published in Geophysical Research Letters
  25. ^ a b c d Siegert, MJ (2000). "The identification, examination and exploration of Antarctic subglacial lakes". Sci Prog. 83 (3): 223–42. PMID 11077478.
  26. ^ O'Hanl, L (5 November 2004). "Antarctic Forests Reveal Ancient Trees". Discovery News. Archived from the original on 28 June 2011. Retrieved 31 January 2011.
  27. ^ "Frozen in time: Fossils from the Antarctic". British Antarctic Survey. 2012. Archived from the original on 9 July 2015. Retrieved 20 August 2012.
  28. ^ Michael Studinger (2006). "Tectonic Control of Subglacial Lakes". Lamont–Doherty Earth Observatory. Lamon–Doherty Earth Observatory, Columbia University. Archived from the original on 14 June 2012. Retrieved 20 August 2012.
  29. ^ Robert Lee Hotz (3 March 2001). "Miles Below Antarctic Ice, a Freshwater Lake May Harbor Ancient Life". Los Angeles Times. Retrieved 20 August 2012.
  30. ^ "Columbia University Scientists Present Long Sought Opportunities to Safely Explore Life Within Earth's Most Ancient and Inaccessible Ecosystem". The Earth Institute at Columbia University. 21 March 2002. Retrieved 31 March 2010.
  31. ^ "Lake Vostok, Antarctica". Lakelubbers LLC. 2012. Retrieved 25 July 2020.
  32. ^ Vincent, Warwick F.; Laybourn-Parry, Johanna (2008). Polar lakes and rivers: limnology of Arctic and Antarctic aquatic ecosystems. Oxford University Press. p. 129. doi:10.1093/acprof:oso/9780199213887.001.0001. ISBN 978-0-19-921388-7.
  33. ^ "Subglacial Lake Environments". Archived from the original on 3 December 2012. Retrieved 6 February 2012.
  34. ^ Zotikov, Igorʹ Alekseevich (26 July 2006). The Antarctic subglacial Lake Vostok: glaciology, biology and planetology. Springer Praxis Books / Geophysical Sciences. ISBN 978-3-540-42649-3. Retrieved 6 February 2012.
  35. ^ Ekaykin, AA; Lipenkov, VY; Petit, JR; Johnsen, S; et al. (2010). "Insights into hydrological regime of Lake Vostok from differential behavior of deuterium and oxygen-18 in accreted ice" (PDF). Journal of Geophysical Research. 115 (C05003): C05003. Bibcode:2010JGRC..115.5003E. doi:10.1029/2009JC005329. S2CID 129827337. Archived (PDF) from the original on 18 May 2022.
  36. ^ a b c d Bulat, SA; Alekhina, Irina A.; Marie, Dominique; Martins, Jean; et al. (2010). "Searching for life in extreme environments relevant to Jovian's Europa: Lessons from subglacial ice studies at Lake Vostok (East Antarctica)". Advances in Space Research. 48 (4): 697–701. Bibcode:2011AdSpR..48..697B. doi:10.1016/j.asr.2010.11.024.
  37. ^ a b c Burton, K (11 August 2003). "Researchers find antarctic lake water will fizz like a soda". NASA. Archived from the original on 11 January 2011. Retrieved 28 January 2011.
  38. ^ Siegert, MJ; Ellis-Evans, J. Cynan; Tranter, Martyn; Mayer, Christoph; et al. (2001). "Physical, chemical and biological processes in Lake Vostok and other Antarctic subglacial lakes". Nature. 414 (6864): 603–9. doi:10.1038/414603a. PMID 11740551. S2CID 4423510.
  39. ^ Wendt, A; Dietrich, Reinhard; Wendt, Jens; Fritsche, Mathias; et al. (2005). "The response of the subglacial Lake Vostok, Antarctica, to tidal and atmospheric pressure forcing". Geophysical Journal International. 161 (1): 41–9. Bibcode:2005GeoJI.161...41W. doi:10.1111/j.1365-246X.2005.02575.x.
  40. ^ Dietrich, R; Shibuya, K.; Pötzsch, A.; Ozawa, T. (2001). "Evidence for tides in the subglacial Lake Vostok, Antarctica". Geophysical Research Letters. 28 (15): 2971–4. Bibcode:2001GeoRL..28.2971D. doi:10.1029/2001GL013230. S2CID 140606157.
  41. ^ Sabbatini, Kristan Hutchinson (4 February 2001). "SOARing Below Vostok" (PDF). The Antarctic Sun. Archived (PDF) from the original on 9 June 2010. Retrieved 3 February 2012.
  42. ^ Bull, Alan T. (2004). Microbial diversity and bioprospecting. ASM Press. pp. 139–. ISBN 978-1-55581-267-6. Retrieved 15 May 2011.
  43. ^ Bulat, SA; Alekhina, Irina A.; Blot, Michel; Petit, Jean-Robert; et al. (August 2004). "DNA signature of thermophilic bacteria from the aged accretion ice of Lake Vostok, Antarctica: implications for searching for life in extreme icy environments". International Journal of Astrobiology. 3 (1): 1–12. Bibcode:2004IJAsB...3....1B. doi:10.1017/S1473550404001879.
  44. ^ "Mystery of Antarctica's 15-Million Year-Old Lake". The Daily Galaxy. 4 December 2007. Archived from the original on 16 March 2008. Retrieved 5 December 2007.
  45. ^ Jouzel, J; Petit, JR; Souchez, R; Barkov, NI; et al. (1999). "More than 200 meters of lake ice above subglacial Lake Vostok, Antarctica". Science. 286 (5447): 2138–41. doi:10.1126/science.286.5447.2138. PMID 10591641.
  46. ^ Priscu, JC; Adams, EE; Lyons, WB; Voytek, MA; et al. (1999). "Geomicrobiology of subglacial ice above Lake Vostok, Antarctica". Science. 286 (5447): 2141–4. doi:10.1126/science.286.5447.2141. PMID 10591642. S2CID 20376311.
  47. ^ Edwards, L (10 January 2011). "Russians hope to reach Lake Vostok for the first time soon". Physorg. Retrieved 29 January 2011.
  48. ^ Vasiliev, N. I.; Talalay, Pavel G. (2011). "Twenty years of drilling the deepest hole in ice". Scientific Drilling. 11 (11, March 2011): 41–45. doi:10.2204/iodp.sd.11.05.2011.
  49. ^ Israel, B (7 February 2011). "Lake Vostok Drilling Mission Iced". Our Amazing Planet. Archived from the original on 10 February 2011. Retrieved 7 February 2011.
  50. ^ Schiermeier, Q (January 2011). "Race against time for raiders of the lost lake". Nature. 469 (7330): 275. Bibcode:2011Natur.469..275S. doi:10.1038/469275a. PMID 21248808.
  51. ^ Cressey, D (7 February 2012). "'Too soon' to confirm success of Antarctic lake drilling". Nature. Retrieved 8 February 2012.
  52. ^ Becky Oskin (9 June 2013). "Ice Above Lake Vostok Includes DNA From Animals". Our Amazing Planet. Discovery. Archived from the original on 15 March 2016. Retrieved 10 July 2013.
  53. ^ "Exotic microbes discovered near Lake Vostok | Science Mission Directorate". science.nasa.gov. 10 December 1999. Archived from the original on 27 January 2019. Retrieved 31 October 2018.
  54. ^ D'Elia, Tom; Veerapaneni, Ram; Rogers, Scott O. (1 August 2008). "Isolation of Microbes from Lake Vostok Accretion Ice". Appl. Environ. Microbiol. 74 (15): 4962–4965. Bibcode:2008ApEnM..74.4962D. doi:10.1128/AEM.02501-07. PMC 2519340. PMID 18552196.
  55. ^ d'Elia, Tom; Veerapaneni, Ram; Theraisnathan, Vincent; Rogers, Scott O. (17 July 2009). "Isolation of fungi from Lake Vostok accretion ice". Mycologia. 101 (6): 751–763. doi:10.3852/08-184. PMID 19927741. S2CID 32676468.
  56. ^ a b Shtarkman, Yury M.; Koçer, Zeynep A.; Edgar, Robyn; Veerapanenimm, Ram S.; et al. (3 July 2013). Watson, Michael (ed.). "Subglacial Lake Vostok (Antarctica) Accretion Ice Contains a Diverse Set of Sequences from Aquatic, Marine and Sediment-Inhabiting Bacteria and Eukarya". PLOS ONE. 8 (7): e67221. Bibcode:2013PLoSO...867221S. doi:10.1371/journal.pone.0067221. PMC 3700977. PMID 23843994.
  57. ^ Boyle, Alan (8 July 2013). "Antarctica's hidden Lake Vostok found to teem with life". NBC News.
  58. ^ Gura, Colby (2020). "Metatranscriptomic and Metagenomic Analysis of Biological Diversity in Subglacial Lake Vostok (Antarctica)". Biology. 9 (3): 55. doi:10.3390/biology9030055. PMC 7150893. PMID 32188079.
  59. ^ Schiermeier, Quirin Schiermeier (9 July 2013). "Claims of Lake Vostok fish get frosty response". Nature. doi:10.1038/nature.2013.13364. S2CID 131665344. Retrieved 10 July 2013.
  60. ^ Staff (7 March 2013). "New life form found in Lake Vostok". The Daily Telegraph. Archived from the original on 12 January 2022. Retrieved 8 March 2013.
  61. ^ Howell, Elizabeth (7 March 2013). "New Type of Bacteria Reportedly Found in Buried Antarctic Lake". LiveScience. Retrieved 8 March 2013.
  62. ^ Staff (9 March 2013). "No unfamiliar microorganisms found in Lake Vostok water - researcher". Interfax. Russia Beyond the Headlines. Retrieved 10 March 2013.[permanent dead link]
  63. ^ Cheah, Carolina. "What Does Water That Has Not Seen The Light Of Day For 20 Million Years Contain?". Malaysian Digest. Archived from the original on 22 June 2018. Retrieved 22 June 2018.
  64. ^ "RUSSIAN RESEARCHERS REACHED SUBGLACIAL LAKE VOSTOK". Russian Geographical Society. Archived from the original on 15 November 2016. Retrieved 15 November 2016.
  65. ^ Bulat, Sergey A. (January 2016). "Microbiology of the subglacial Lake Vostok: first results of borehole-frozen lake water analysis and prospects for searching for lake inhabitants". Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences. 374 (2059). Bibcode:2016RSPTA.37440292B. doi:10.1098/rsta.2014.0292. PMID 26667905. S2CID 8399775. Retrieved 11 October 2021.
  66. ^ Spindler, Bill. "Lake Vostok Drilling Project". Amundsen-Scott South Pole Station. Retrieved 11 October 2021.
  67. ^ Staff (14 October 2015). "Russian Antarctic Expedition Halts Research Due to Lack of Funds". The Moscow Times. Moscow. Retrieved 15 October 2015.
  68. ^ Gramling, C. (2015). "Mysterious Antarctic lake will remain out of reach". Science. 350 (6260): 494. doi:10.1126/science.350.6260.494. PMID 26516262.
  69. ^ Staff (20 December 2020). "Trouble at the Vostok Station". Meduza.io. Retrieved 8 February 2022.
  70. ^ Staff (6 December 2021). "New wintering complex of Vostok station delivered to Antarctica". Ministry of Natural Resources of Russia. Retrieved 8 February 2022.
  71. ^ a b Niiler, E (9 February 2011). "Antarctic Drilling Plan Raises Concerns". Discovery News. Archived from the original on 12 February 2011. Retrieved 10 February 2011.
  72. ^ "Exploration of Antarctic Subglacial" (PDF). National Academy of Sciences. National Research Council. 2007. Archived from the original (PDF) on 12 June 2018. Retrieved 9 February 2011.
  73. ^ Darby, A (8 February 2011). "Antarctic Treaty no match for national pride". The Sydney Morning Herald. Retrieved 9 February 2011.
  74. ^ Sarkar, Jaimini. "Drilling at Lake Vostok by the Russians" (PDF). Archived (PDF) from the original on 19 April 2014. Retrieved 28 December 2012.
  75. ^ Данилевич, Елена (6 June 2012). Озеро Восток - "кусочек" Марса на Земле? (in Russian). Argumenty i Fakty. Retrieved 25 December 2012.
  76. ^ Alekhina, Irina; Ekaykin, Alexey; Moskvin, Alexey; Lipenkov, Vladimir (2017). "Chemical characteristics of the ice cores obtained after the first unsealing of subglacial Lake Vostok". Geological Society, London, Special Publications. 461: 187–196. doi:10.1144/SP461.3. S2CID 219193990.
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