@Antarctica
Introduction Antarctica
Background:
Speculation over the existence of a "southern land" was not
confirmed until the early 1820s when British and American commercial
operators and British and Russian national expeditions began
exploring the Antarctic Peninsula region and other areas south of
the Antarctic Circle. Not until 1840 was it established that
Antarctica was indeed a continent and not just a group of islands.
Several exploration "firsts" were achieved in the early 20th
century. Following World War II, there was an upsurge in scientific
research on the continent. A number of countries have set up
year-round research stations on Antarctica. Seven have made
territorial claims, but not all countries recognize these claims. In
order to form a legal framework for the activities of nations on the
continent, an Antarctic Treaty was negotiated that neither denies
nor gives recognition to existing territorial claims; signed in
1959, it entered into force in 1961.
Geography Antarctica
Location:
continent mostly south of the Antarctic Circle
Geographic coordinates:
90 00 S, 0 00 E
Map references:
Antarctic Region
Area:
total: 14 million sq km
land: 14 million sq km (280,000 sq km ice-free, 13.72 million sq km
ice-covered) (est.)
note: fifth-largest continent, following Asia, Africa, North
America, and South America, but larger than Australia and the
subcontinent of Europe
Area - comparative:
slightly less than 1.5 times the size of the US
Land boundaries: 0 km note: see entry on Disputes - international
Coastline:
17,968 km
Maritime claims:
Australia, Chile, and Argentina claim Exclusive Economic Zone (EEZ)
rights or similar over 200 nm extensions seaward from their
continental claims, but like the claims themselves, these zones are
not accepted by other countries; 20 of 27 Antarctic consultative
nations have made no claims to Antarctic territory (although Russia
and the US have reserved the right to do so) and do not recognize
the claims of the other nations; also see the Disputes -
international entry
Climate:
severe low temperatures vary with latitude, elevation, and distance
from the ocean; East Antarctica is colder than West Antarctica
because of its higher elevation; Antarctic Peninsula has the most
moderate climate; higher temperatures occur in January along the
coast and average slightly below freezing
Terrain:
about 98% thick continental ice sheet and 2% barren rock, with
average elevations between 2,000 and 4,000 meters; mountain ranges
up to nearly 5,000 meters; ice-free coastal areas include parts of
southern Victoria Land, Wilkes Land, the Antarctic Peninsula area,
and parts of Ross Island on McMurdo Sound; glaciers form ice shelves
along about half of the coastline, and floating ice shelves
constitute 11% of the area of the continent
Elevation extremes:
lowest point: Bentley Subglacial Trench −2,555 m
highest point: Vinson Massif 4,897 m
note: the lowest known land point in Antarctica is hidden in the
Bentley Subglacial Trench; at its surface is the deepest ice yet
discovered and the world's lowest elevation not under seawater
Natural resources:
iron ore, chromium, copper, gold, nickel, platinum and other
minerals, and coal and hydrocarbons have been found in small
uncommercial quantities; none presently exploited; krill, finfish,
and crab have been taken by commercial fisheries
Land use: arable land: 0% permanent crops: 0% other: 100% (ice 98%, barren rock 2%) (2001)
Irrigated land:
0 sq km
Natural hazards:
katabatic (gravity-driven) winds blow coastward from the high
interior; frequent blizzards form near the foot of the plateau;
cyclonic storms form over the ocean and move clockwise along the
coast; volcanism on Deception Island and isolated areas of West
Antarctica; other seismic activity rare and weak; large icebergs may
calve from ice shelf
Environment - current issues:
in 1998, NASA satellite data showed that the antarctic ozone hole
was the largest on record, covering 27 million square kilometers;
researchers in 1997 found that increased ultraviolet light passing
