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@Southern Ocean

Introduction Southern Ocean

Background:
A decision by the International Hydrographic Organization in the
spring of 2000 delimited a fifth world ocean - the Southern Ocean -
from the southern portions of the Atlantic Ocean, Indian Ocean, and
Pacific Ocean. The Southern Ocean extends from the coast of
Antarctica north to 60 degrees south latitude, which coincides with
the Antarctic Treaty Limit. The Southern Ocean is now the fourth
largest of the world's five oceans (after the Pacific Ocean,
Atlantic Ocean, and Indian Ocean, but larger than the Arctic Ocean).

Geography Southern Ocean

Location:
body of water between 60 degrees south latitude and Antarctica

Geographic coordinates:
65 00 S, 0 00 E (nominally), but the Southern Ocean has the unique
distinction of being a large circumpolar body of water totally
encircling the continent of Antarctica; this ring of water lies
between 60 degrees south latitude and the coast of Antarctica and
encompasses 360 degrees of longitude

Map references:
Antarctic Region

Area:
total: 20.327 million sq km
note: includes Amundsen Sea, Bellingshausen Sea, part of the Drake
Passage, Ross Sea, a small part of the Scotia Sea, Weddell Sea, and
other tributary water bodies

Area - comparative:
slightly more than twice the size of the US

Coastline:
17,968 km

Climate:
sea temperatures vary from about 10 degrees Celsius to -2 degrees
Celsius; cyclonic storms travel eastward around the continent and
frequently are intense because of the temperature contrast between
ice and open ocean; the ocean area from about latitude 40 south to
the Antarctic Circle has the strongest average winds found anywhere
on Earth; in winter the ocean freezes outward to 65 degrees south
latitude in the Pacific sector and 55 degrees south latitude in the
Atlantic sector, lowering surface temperatures well below 0 degrees
Celsius; at some coastal points intense persistent drainage winds
from the interior keep the shoreline ice-free throughout the winter

Terrain:
the Southern Ocean is deep, 4,000 to 5,000 meters over most of its
extent with only limited areas of shallow water; the Antarctic
continental shelf is generally narrow and unusually deep, its edge
lying at depths of 400 to 800 meters (the global mean is 133
meters); the Antarctic icepack grows from an average minimum of 2.6
mi