Antarctica

C

Climate and Weather in Antarctica

Antarctica has several climates, all cold but differing considerably in severity. East Antarctica’s high plateau region yields the lowest year-round temperatures due to its relatively high elevation. The world’s lowest yearly air temperatures, typically –88°C (–126°F), are recorded in late August at Russia’s Vostok station. In coastal regions latitude is more significant than elevation. The higher the latitude (that is, the closer to the pole) the lower the average temperatures. The west coast of the Antarctic Peninsula and the neighboring islands have the mildest climates, with average January temperatures above freezing. Some of the fastest warming on Earth has occurred around the Antarctic Peninsula, with a rise of almost 3°C (5°F) over the past 50 years. Elsewhere in Antarctica, however, temperatures and precipitation have remained relatively steady over the same time period.

The entire region south of the Antarctic Circle, which is the parallel of latitude at 66°30’ south, experiences at least one day of continuous daylight during the Southern Hemisphere’s summer (around December 21) and one day of continuous darkness during the winter (around June 21). The interior of Antarctica has almost continuous daylight during the summer and darkness during the winter. In coastal areas farther north, there are fewer days of continuous daylight and darkness, and sunrises and sunsets occur more frequently.

Precipitation falls mainly as snow or ice, with occasional rain in coastal areas. Very little precipitation falls on the high plateau. Average annual accumulations of 50 mm (2 in) there make it one of the world’s driest deserts. Successive low-pressure systems around the coasts and islands bring heavier snow, which is packed down by wind and its own weight to form ice. Winds are light and variable on the plateaus, rarely reaching more than 30 km/h (20 mph), but are strong and persistent closer to the coasts. Katabatic, or downslope, winds blow cold, dense air down the steep slopes from the interior highlands onto the lower ice slopes.

Chemical reactions that occur at high altitudes in the atmosphere have affected the ozone layer over the Antarctic region, creating an ozone hole. During the cold polar night, naturally forming clouds of nitrogen-containing compounds and water vapor in the stratosphere over Antarctica react with synthetic chemicals such as chlorofluorocarbons and bromine halocarbons. When the mix of chemicals is exposed to sunlight in spring, additional chemical reactions with chlorine or bromine remove ozone from the stratosphere. Preventing the release or reducing the levels of the chlorine and bromine-containing chemicals would allow the ozone layer to recover.

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D

Optical Phenomena in Antarctica

Antarctica experiences many unusual atmospheric optical phenomena. Most spectacular is the aurora australis (southern lights), caused by entry into the upper atmosphere of streams of charged particles (mainly protons and electrons) from the Sun. Deflected by the Earth’s magnetic field, the particles collide with atoms and molecules of atmospheric gases 100 to 140 km (60 to 90 mi) above the Earth’s surface. This produces light in characteristic rays, bands, and rings of various hues. Within the southern auroral zone—a wide circle about 4,000 km (about 2,000 mi) in diameter and centered around the geomagnetic pole (the south end of the axis of the geomagnetic field that surrounds the Earth)—auroral displays are visible almost every winter night, including the 24-hour-long polar night.

Refraction of light from the Sun and Moon by concentrations of ice crystals in the lower atmosphere produces iridescent clouds in the sky and rainbow-like halos around the Sun and Moon. Similar atmospheric distortions produce colored disks resembling the Sun and Moon—called parhelia, or sun dogs, and parselene respectively—as well as colored arches in the sky. More rarely, high altitude ice clouds called noctilucent clouds are visible after sunset. Dry atmosphere chilled by contact with the cold surface of Earth gives rise to spectacular mirages, in which distant objects are raised above the horizon to appear misleadingly close.

E

Vegetation in Antarctica

Almost completely covered by thick ice, Antarctica has very little land available for soils to form or vegetation to settle. Existing soils were formed late in the continent’s geologic history and have little organic content or water-holding capacity. Isolation from other continents makes it difficult for new types of vegetation to spread to Antarctica. Constant low temperatures, high winds, and lack of moisture discourage all but the hardiest plants, which may be capable of active growth for only a few days per year. These factors limit plant life in Antarctica almost entirely to protists (simple, often one-celled organisms), algae, lichens, and mosses. Only two known species of flowering plants, both found only on the Antarctic Peninsula and neighboring islands, grow in Antarctica. The continent has no equivalent of Arctic tundra, which supports a greater variety of plant life: Antarctica’s richest vegetation compares with the northernmost, scarcest Arctic polar desert vegetation. Nevertheless, patches of vegetation grow on all known rocky outcrops in Antarctica, to within 290 km (180 mi) of the South Pole. Snow algae grow on snow and ice surfaces close to the coast, especially along the Antarctic Peninsula where seabird droppings and sea spray provide nutrients. Minute lichens grow within the surface layers of crystalline rocks, and microbes are present in snow, soils and ice-covered lakes.

Antarctic waters support other types of vegetation. Coastal seaweeds thrive on and around islands near the Antarctic Convergence, but are inhibited farther south where sea ice scrapes the shores. The cold waters of the Southern Ocean support masses of phytoplankton—minute floating plants including diatoms, dinoflagellates, and other algae—that proliferate in summer, especially in areas where upwelling brings nutrient-rich waters to the surface (see Marine Life: Environmental Factors). Phytoplankton provides a rich source of food for marine animals.

F

Animal Life in Antarctica

The harsh climate and sparse vegetation of Antarctica’s land regions support only microscopic animals and primitive insects. Protozoa, nematodes, tardigrades, and other minute forms inhabit damp soils. Other invertebrate species include springtails and mites. The wingless midge, which grows up to 12 mm (0.47 in) long, is the largest land animal.

In contrast to the land, the Southern Ocean supports a wide variety of animal life, which all depends directly or indirectly on the phytoplankton of the surface waters. Zooplankton—including krill, copepods, arrowworms, jellyfish, fish larvae, and larval forms of bottom-dwelling starfish, bristle worms, sea anemones, and mollusks—feed on phytoplankton. Zooplankton in turn provide food for fish and squid, both of which are abundant in Antarctic waters. Members of one group of fish known as icefish have natural antifreeze to survive in the cold temperatures. Concentrated swarms of zooplankton (especially of krill and young fish), together with larger fish (especially of superfamily Notothenioidea) and squid, provide food for the seals, whales, and seabirds that are Antarctica’s major predators and most prominent animals. Some organisms grow to large size in the cold waters, including giant marine isopods related to sow bugs, giant starfish, and giant sea spiders.

Whales are plentiful in the Southern Ocean, more so since commercial whaling ended in the 1960s. Baleen whales such as blue, fin, sei, minke, humpback, and southern right whales feed mainly on krill and small fish, which they filter from the water. Among toothed whales, sperm whales and bottle-nosed whales feed mainly on fish and squid, which they catch in deep water, while killer whales (orcas) and several species of dolphins feed mainly on surface-living fish. Killer whales also prey on penguins and seals.

Several species of seals breed within the Antarctic region. Weddell and leopard seals live closest to the continental shore, while crabeater and Ross seals live mainly on pack ice. Elephant seals (the largest species) and fur seals breed mainly on the warmer fringing islands.

About 40 species of seabirds—including 7 species of penguins, 4 species of albatross, 20 species of petrels, as well as cormorants, gulls, skuas, and terns—breed within the region, mainly on islands and continental coasts. In summer, snowy petrels fly long distances over the ice to breed in inland mountain ranges. Major populations of penguins are found around Antarctica, including Adélie, emperor, chinstrap, and gentoo penguins. Emperor penguins breed in winter on sea ice. Local warming in the Antarctic Peninsula area is affecting some stocks of penguins by reducing sea ice in areas in which they breed or feed.

Large marine animals played an important role in attracting humans to Antarctica: Sealers and whalers contributed substantially to the early exploration of the Southern Ocean and coastal regions. Fur seals and southern elephant seals of the islands near the Antarctic Convergence were hunted for skins and oil throughout the 19th century until economically profitable stocks were depleted. Hunting of elephant seals continued into the 1950s. From 1904 through the 1960s whalers hunted large migratory whales (blue, fin, sei, humpback, and sperm whales) for oil in Antarctic waters from whaling stations on several Antarctic islands and from floating factory ships. Beginning in the 1960s concern that seals and whales would be hunted to extinction prompted several measures to protect surviving populations. (For more information, see the Management and Conservation of Antarctica section of this article.)

G

Mineral Resources in Antarctica

Although only about 1 percent of the continent’s ice-free areas have been surveyed for minerals, evidence indicates that Antarctica contains rich mineral deposits. The Transantarctic Mountains contain huge deposits of coal as well as copper, lead, zinc, silver, tin, and gold. The Prince Charles Mountains of East Antarctica are rich in iron ore; the Antarctic Peninsula contains copper and molybdenum ores; and the Dufek Massif includes ores of chromium, platinum, copper, and nickel. It is also believed that deposits of petroleum and natural gas exist in the continental shelf regions, such as the area under the Ross Sea. Although Antarctica has prospects for mineral development, there are concerns about the potential environmental and political impacts of this development. In 1991 the signatory nations of the Antarctic Treaty agreed to a 50-year moratorium on commercial mining activity. The only mineral resources currently used are sand, gravel, and crushed rocks for constructing airstrips and building foundations at the scientific stations.

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