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The Antarctic Environment

The coldest, highest, windiest, driest continent on Earth

Overview

The Antarctic continent is a land mass covered with ice up to 13,000ft (4km) thick. There is some exposed rock and the only plants are very small mosses and lichens (although it was once heavily vegetated – millions of years ago). Antarctica is the highest, driest, windiest, coldest continent in the world.

Size of Antarctica

With all islands and ice shelves, Antarctica is nearly 1½ times the size of the USA, twice the size of Australia, and 58 times the size of the UK. It covers 8,500,000 square miles (13,661,000 square kilometers).

Height of Antarctica

Antarctica is the highest continent on Earth: average elevation is 8,200ft (2500m). The elevation at the South Pole is 9,300ft (2835m). The highest point on the icecap is in Australian Antarctic Territory at 13,451ft (4100m), at 82° 20'S, 56° 30'E. Mount Vinson is the highest mountain in Antarctica at 16,050ft (4892m).

Snow (precipitation) in Antarctica

Antarctica is the driest continent on earth. The amount of moisture received by the polar plateau is comparable to that falling on the world's hot deserts, as low as 0.8 inches (20mm) per year.

Temperature and Wind in Antarctica

Antarctica is the coldest continent on earth. The lowest temperature ever recorded on earth was -128.6F (-89.2C) at Vostok in the Australian Antarctic Territory, in 1983. Antarctica is the windiest continent on earth. Winds flow down the coastal slopes under the influence of gravity. Speeds of these katabatic winds have been recorded up to 204 miles per hour (327 kilometers per hour).

The closest country to Antarctica

South America, whose tip is shared by Chile and Argentina, is the closest continent to Antarctica. It is 774 miles (1238 km) from Ushuaia, the southern-most city of Argentina, to the Argentine station, Vice Comodoro Marambio, at the tip of the Antarctic Peninsula.

Geography

About 98% of Antarctica is covered by the Antarctic ice sheet, a sheet of ice averaging at least 1.0 mile (1.6 km) thick. The continent has about 90% of the world's ice (and thereby about 70% of the world's fresh water). If all of this ice were to melt, sea levels would rise about 200 ft (60m). Antarctica is divided into two contrasting parts by the Transantarctic Mountains that cross the continent close to the 'neck' between the Weddell and Ross Seas. 

West Antarctica, which includes the Antarctic Peninsula, is smaller and consists of four land units each with a different history. There has been major volcanic activity here in recent geological times and there are still a few active volcanic centres. Deep waters exist between land units and the West Antarctic ice sheet, which can be considered to a be floating ice mass held in place by land peaks. The West Antarctic Ice Sheet has been of recent concern because of the real, if small, possibility of its collapse. If the sheet were to break down, ocean levels would rise by several metres in a relatively geologically short period of time, perhaps a matter of centuries. ANI has been supporting researchers from the University of New South Wales who are investigating how West Antarctica has responded to temperature changes in the recent geological past. www.christurney.com/Home/Antarctica.html and http://tv.unsw.edu.au/video/antarctica-1912-discovering-science-on-ice

Most of East Antarctica is still not well known by geologists but it does include the Transantarctic Mountains. The shield is very depressed in the centre, where it carries the bulk of the Antarctic ice sheet. Large areas lie deeper than 3,280ft (1000m) below sea level.

Mountains and Volcanos

Antarctica's highest peaks are located in the Sentinel Range of the Ellsworth Mountains. Mount Vinson is the highest mountain in Antarctica at 16,050ft (4892m). Peaks in the Transantarctic Mountains commonly exceed 13,000ft (4000m) elevation. Mount Erebus, located on Ross Island, is the world's southernmost active volcano. Another well-known volcano is found on Deception Island, which is famous for a giant eruption in 1970. Mount Sidley 14,058ft (4285m), located in the Executive Committee Range of Marie Byrd Land, is the highest volcano in Antarctica. Read about ANI's Mount Sidley Experience

Subglacial Lakes

More than one hundred and forty five subglacial lakes have been discovered beneath the Antarctic ice sheet. These lakes have been isolated from the surface for considerable periods of time and each represents a unique environment. One subglacial lake in West Antarctica, named Lake Ellsworth, is well suited to exploratory research. In 2007 and 2008 scientists used seismic and radar surveys to map the outline of the lake, measure the depth of the water and establish that sediments suitable for coring, which could contain a record of ice sheet history, are present on the lake floor. Researchers will return in 2012-13, with the support of ANI. The scientists will use a hot water drill to melt through the overlying ice sheet into the lake water, before deploying a probe (to test for life in the lake) and a sediment corer (to recover sediment from the lake-floor). Read about the Lake Ellsworth Project http://www.geos.ed.ac.uk/research/ellsworth/

Geology

More than 180 million years ago, Antarctica, along with Africa, South America and peninsular India, was part of the supercontinent Gondwana. Over time, Gondwana gradually broke apart and Antarctica drifted to its present location centered at 90S latitude. Ultimate separation of Australia and South America from Antarctica about 35 million years ago created a circumpolar current that resulted in an isolated continent. This in turn led to long-term snowfall and preservation of glaciers and an eventual ice sheet, beginning some 14 million years ago.

Like all other continents, Antarctica has at its core an ancient shield. The rocks of the East Antarctica shield are as old as 4 billion years, which means that they are amongst the oldest known rocks on Earth. Geologists are now studying this shield to help them gain insight into the early geological processes of the Earth's history.

Geologically, West Antarctica closely resembles the Andes mountain range of South America. The only anomalous area of West Antarctica is the Ellsworth Mountains region, where the stratigraphy is more similar to that of the Transantarctic Mountains and East Antarctica. This suggests that the Ellsworth Mountains must have broken away from a direct connection to the Transantarctic Mountains and rotated 90 degrees to reach their present location in West Antarctica.

Mineral Resources

The main known mineral resource on the continent is coal. It was first recorded near the Beardmore Glacier by Frank Wild on the Nimrod Expedition, and now low-grade coal is known across many parts of the Transantarctic Mountains. The Prince Charles Mountains contain significant deposits of iron ore. The most valuable resources of Antarctica lie offshore, namely the oil and natural gas fields found in the Ross Sea in 1973. The Protocol on Environmental Protection to the Antarctic Treaty prohibits all activities relating to Antarctic mineral resources, except for scientific research.

Climate

Antarctica is a frozen desert with little precipitation; the South Pole itself receives less than 4 inches (10cm) per year, on average. Temperatures reach a minimum of between -112F (-80C) and -130F (-90C) in the interior in winter and reach a maximum of between 41F (5C) and 59F (15C) near the coast in summer.

East Antarctica is colder than its western counterpart because of its higher elevation. Weather fronts rarely penetrate far into the continent, leaving the center cold and dry. Despite the lack of precipitation over the central portion of the continent, ice there lasts for extended time periods. Heavy snowfalls are not uncommon on the coastal portion of the continent, where snowfalls of up to 48 inches (1.22m) in 48 hours have been recorded.

At the edge of the continent, strong katabatic winds off the polar plateau often blow at storm force. In the interior, however, wind speeds are typically moderate. During summer, more solar radiation reaches the surface during clear days at the South Pole than at the equator because of the 24 hours of sunlight each day at the Pole. Sunburn is often a health issue as the snow surface reflects almost all of the ultraviolet light falling on it.

Antarctica is colder than the Arctic for two reasons. First, much of the continent is more than 2 miles (3km) above sea level and temperature decreases with elevation. Second, the Arctic Ocean covers the north polar zone: the ocean's relative warmth is transferred through the icepack and prevents temperatures in the Arctic regions from reaching the extremes typical of the land surface of Antarctica.

Flora

The flora of the Antarctic consists of around 250 lichens, 100 mosses, 25-30 liverworts, around 700 terrestrial and aquatic algal species, an unknown number of (mostly microscopic) fungi, and 2 flowering plants. The main factor that determines the distribution of terrestrial plant life in Antarctica is the availability of free water.

A lichen is a plant formed from the symbiotic association of certain fungi and (usually) green algae. Lichens occupy many different habitats, often in extreme environments. Three main types of lichens exist in Antarctica. Crustose lichens, which form a thin crust on the surface of the substrate they grow on; foliose lichens, which form leaf like lobes; and fruticose lichens which have a shrubby growth habit. Lichens have very slow growth rates. In the harsh environment of Antarctica's interior, growth may be as little as 0.4 inches (1cm) per 1000 years.

Lichens have a number of adaptations that enable them to survive in Antarctica. They are able to exhibit net photosynthesis while frozen at temperatures as low as -4F (-20C). They can absorb water from a saturated atmosphere when covered by snow. Additionally, snow cover affords protection from the elements and most growth appears to occur when they are buried beneath at least a thin protective layer of snow. They can survive long unfavourable periods of drought in a dry and inactive state. In continental Antarctica, many lichens are able to absorb water vapour from snow and ice.

Fauna

Few terrestrial vertebrates live in Antarctica. Invertebrate life includes microscopic mites, lice, nematodes, tardigrades, rotifers, krill and springtails. Recently ancient ecosystems consisting of several types of bacteria have been found living trapped deep beneath glaciers. The flightless midge Belgica antarctica, up to 0.2 inches (6mm) in size, is the largest purely terrestrial animal in Antarctica. The snow petrel is one of only three birds that breed exclusively in Antarctica. The wide variety of marine animals includes emperor, Adélie and rockhopper penguins, blue whales, orcas, colossal squids and fur seals. King penguins, chinstrap penguins and gentoo penguins also breed in the Antarctic.

More Info

www.antarctica.gov.au/about-antarctica/fact-files
www.antarctica.ac.uk/about_antarctica/index.php