e body of recent oceanographic research has shown that the
Antarctic Circumpolar Current (ACC), an ocean current that flows
from west to east around Antarctica, plays a crucial role in global
ocean circulation. The region where the cold waters of the ACC meet
and mingle with the warmer waters of the north defines a distinct
border - the Antarctic Convergence - which fluctuates with the
seasons, but which encompasses a discrete body of water and a unique
ecologic region. The Convergence concentrates nutrients, which
promotes marine plant life, and which in turn allows for a greater
abundance of animal life. In the spring of 2000, the International
Hydrographic Organization decided to delimit the waters within the
Convergence as a fifth world ocean - the Southern Ocean - by
combining 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 and which approximates the extent of the
Antarctic Convergence. As such, 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).
It should be noted that inclusion of the Southern Ocean does not
imply recognition of this feature as one of the world's primary
oceans by the US Government.

Geography
Southern Ocean

Location:

body of water between 60 degrees south latitude and Antarctica

Geographic coordinates:

60 00 S, 90 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 latitu