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Antarctic Extremes Climatology JO CREBBIN/SHUTTERSTOCKJO Antarctic Extremes THE MAGAZINE OF THE PAS 4 1–2/61–62/2019 Antarctica is a land of surprises. How low are the lowest temperatures ever recorded there? Is there life at –50°C? Is there anywhere on the continent tourists can actually enjoy swimming? THE MAGAZINE 5 OF THE PAS 1–2/61–62/2019 Focus on Climatology Prof. Stanisław ing organisms. Variations in Antarctic land and water Rakusa-Suszczewski temperatures condition the occurrence of euryther- mic organisms (adapted to living in a wide range of Professor emeritus temperatures), stenothermic organisms (adapted to of the Antarctic Biology Department, PAS smaller temperature fluctuations), or hypostenother- Institute of Biochemistry and Biophysics mic organisms (adapted to constant temperatures or Prof. Stanisław poorly resistant to fluctuations, as in haibats near the Rakusa- shores of the continent or under the shelf glaciers). -Suszczewski (PhD, DSc) A frigid land of ice? is a biologist, ntarctica is an icy continent in the south- oceanologist, polar ern hemisphere encompassing an area of In 1983 the Vostok station recorded a temperature explorer, co-creator of Aover 14 million km2. Only 1,500 km of this, along the of –89.2°C, although it is estimated that it may drop the Polish polar program, founder of coasts, consists of rocky oases, whereas the rest, near- there to as low as –96.0°C. The highest temperature the Henryk Arctowski ly 18,000 km, is ice-covered. The average elevation ever recorded there was –13.6°C. Recent studies using Polish Antarctic Station of the continent is 2000 m above sea level, but the satellites have shown that with very low humidity and on King George Island Vostok station lies at 3488 m a.s.l., while the Amund- high albedo (with a large share of solar radiation being in West Antarctica, and sen–Scott South Pole Station is at 2835 m a.s.l. The reflected from the surface), the temperature in the ice a corresponding continent is surrounded by three oceans with an area cavities of the central Antarctic sometimes drops to member of the Polish of about 50 million km2, enwreathing Antarctica in- –100°C, the lowest temperature recorded on Earth. Academy of Sciences. side a convergence line. This Atlantic Convergence At the same time, black rocks can grow quite hot in [email protected] marks off an area where highly dense cold surface the sunshine. The range of temperature differences is water pushes under warmer sub-polar water, where therefore quite vast. there is high baric pressure. The persistent pressure Below the Vostok station, under a layer of ice difference, high in the convergence region and low in 4,000 m thick, there is a large lake of the same name, the divergence zone, closer to the continent, causes in which fresh water is highly oxidized as a result of a difference in the water level and is the reason why the huge pressure and maintains a temperature of it travels northward away from the continent and re- –3.0°C. There are many indications that there are mi- turns southward in deeper layers. A current called the croorganisms living in Lake Vostok that have been West Wind Drift flows to the east around the conti- isolated from the earth’s surface for about 0.5 to 1 mil- nent, while near the continental shores the East Wind lion years. Bacterial DNA has been found in ice cores. Poland’s Henryk Arctowski current flows in the opposite direction. Currently, over 300 continental lakes have been Antarctic Station These phenomena together determine the tem- discovered, linked by a network of sub-ice rivers with on King George Island peratures in Antarctica. Temperature is important periodic “catastrophic” flows. One of the oddest of in West Antarctica. for global physical, chemical and biological processes, these is Don Juan Poland located in the Dry Valleys and at the physiological and molecular level for liv- of Victoria Land. The lake is saline, rich in calcium EVENFH/SHUTTERSTOCK THE MAGAZINE OF THE PAS 6 1–2/61–62/2019 PROF. STANISŁAW RAKUSA-SUSZCZEWSKI 61 Measurements of sea water temperatures in the South 1 Shetland area were made ELEPHANT during the Polish ISLAND expeditions of the “Professor DRAKE PASSAGE Siedlecki” ship in three regions: between King KING GEORGE ISLAND George Island and Ivory 62 Island (region 1), in the northern part of Bransfield SOUTH SHETLANDS Strait and Admiralty Bay 2 (region 2), and in the central Bransfield area (region 3) to a depth of 500 m during spring and summer. For LIVINGSTON BRANSFIELD3 STRAIT ISLAND region 1 during the studied period, the surface 63 temperature ranged from –1.7 to +2.0°C, and at a depth of 500 m from –0.2 to +1.7°C. In region 2 the surface temperature ranged from –1.8 to +1.8°C, and at 400 m from –1.1 to 0.2°C, while in region 3 on the 64 surface it ranged from –1.7 to 1.4°C, and at a depth of WEDDELL SEA 500 m from –1.0 to –0.5°C. ANTARCTIC PENINSULA Region 1 on the edge of the shelf and Drake Passage was the warmest. Waters flow 62 61 60 59 58 57 56 55 into Admiralty Bay from the west and the Drake Passage. chloride, and so remains liquid even at a temperature search conducted on a lake in the Thala Hills oasis of –50°C. Some scientists consider its conditions to in 1969 showed that freezing led to increased water resemble those found on Mars. pressure, oxidation, and catastrophic flows, which is similar to the sub-ice lakes discovered deep in the Ant- A diverse coastline arctic continent over the last 20 years. My research discovered that the sea water tem- The climate of the coastal areas of East Antarctica is perature at the shore of the Thala Hills oasis in En- determined by the dome of the ice sheet and the prox- derby Land fluctuated from –1.6°C in December 1971 imity of the sea. Negative air temperatures occur there to –0.05°C in January 1972. In winter, temperatures throughout the year, with the annual average being in the littoral zone vary slightly and oscillate around around –11°C near the Molodyozhnaya station, and –1.8°C. In winter, baric low pressures are most signif- absolute values ranging from +9°C to –42°C. In the icant, as they draw in slightly warmer water deeper Thala Hills oasis there are about 40 freshwater reser- under the ice surface. voirs ranging in depth from several cm to 2‒3 m cov- On the opposite side of the continent, in the Mc- ered in ice for 10 months and freezing all the way to Murdo Strait and below the Ross shelf glacier, the the bottom, but in the summer the present author has waters have a negative temperature and annual fluc- observed temperatures reaching from 9.2°C in shallow tuations do not exceed 0.2°C. These, in my view, are rock pools, to over 20°C. In the summer, the large, hypostenothermic conditions, which affects the organ- 30 m deep Lake Glubokoye thaws at the rocky shore, isms living there. Under the shelf glaciers, the water where temperatures reach 5°C, while at the bottom of temperature may be lower than –1.9°C, but then its the lake the temperature reaches 4°C. Every few years salinity and density increase, which causes it to flow to the lake overflows with water, causing a catastrophic the bottom of the sea. On the island of Rossa there are outflow to the sea. Cyanobacteria are found in the also volcanoes, Erebus (3794 m a.s.l.) and Terror, the water, while the fauna includes rotifera, nematodes, first of which is active. Such high ice-covered moun- and tardigrades. Only two copepod species have been tains and volcanic activity contribute to the extreme found in the large lakes of the Bunger Oasis. My re- temperature differences in this area. In the ice caves THE MAGAZINE 7 OF THE PAS 1–2/61–62/2019 Focus on Climatology COLIN HARNISH/SHUTTERSTOCK McMurdo Station here, temperatures are close to 0°C, which even pro- Station cover a span of 49.0°C. Admiralty Bay is sur- in Antarctica, maintained motes the existence of fungi and unique chemolithoau- rounded by high hills and open to the south, which by the United States. totrophic bacteria that feed on elements found in rocks. means that cold air from the south-east flows in and stays here, and in the summer this region generally Conditions around experiences western winds (warm and dry); the tem- King George Island perature is also affected by greater sun radiation with fewer clouds than at the Bellingshausen station. Bell- The Arctowski station is located on King George Is- ingshausen is located on a low peninsula between the land in the South Shetland Archipelago in West Ant- Drake Passage and the Bransfield Straight. arctica. Measurements made at Arctowski station The soil temperature at the Arctowski station in eight times a day by licensed IMGW observers during the years 1977‒1999 was +0.5°C on average, the air the years 1978‒1987 gave an average air temperature of temperature –1.6°C. At a depth of 1 cm, the tempera- –18°C for the period, fluctuating in individual years ture increased at a rate of 0.03°C per year. The highest from –0.9°C in 1979 and –0.6°C in 1985, to –2.8°C in temperature on the soil surface on a sunny day was 1986.
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