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South Atlantic Gyre

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From Wikipedia, the free encyclopedia

Subtropical gyre in the south Atlantic Ocean

The ocean currents and gyres of Earth, based on a "dolphins perspective" with flow direction
(warm in red, cold in blue)

TheSouth Atlantic Gyre is thesubtropical gyre in the southAtlantic Ocean. In the southern portion of the gyre, northwesterly (or southeastward-flowing) winds drive eastward-flowing currents that are difficult to distinguish from the northern boundary of theAntarctic Circumpolar Current.^[1] Like other oceanic gyres, it collects vast amounts of floating debris as agarbage patch.^[2]

Southern boundary

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Main article:Antarctic Circumpolar Current

South of this gyre is theAntarctic Circumpolar Current. This current flows from West to East aroundAntarctica. Another name for this current is the West Wind Drift. This current allows Antarctica to maintain its huge ice sheet by keeping warm ocean waters away. At approximately 125 Sv, this current is the largest ocean current.^[3]

Western boundary

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Main article:Brazil Current

Atristan thrush onInaccessible Island, strewn with oceanic trash.

TheBrazil Current is thewestern boundary current of the gyre. It flows south along the Brazilian coast to theRio de la Plata. The current is considerably weaker than its North Atlantic counterpart, theGulf Stream.^[4]

References

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^Guhin, S.; Ray, P.; Mariano, A. J.; Ryan, E. H. (2003)."The South Atlantic Current". Ocean Surface Currents.Rosenstiel School of Marine, Atmospheric, and Earth Science,University of Miami. Archived fromthe original on 23 April 2023. Retrieved21 October 2009.
^"National Geographic Endeavour: At Sea, South Atlantic Gyre".Daily Expedition Report.Lindblad Expeditions,National Geographic Society. 18 March 2004. Retrieved5 April 2014.
^Smith, R.; Desflots, M.; White, S.; Mariano, A. J.; Ryan, E. H. (2013)."The Antarctic Circumpolar Current". Ocean Surface Currents. Archived fromthe original on 14 June 2010. Retrieved21 October 2009.
^Bischof, B.; Rowe, E.; Mariano, A. J.; Ryan, E. H. (2004)."The Brazil Current". Ocean Surface Currents. Archived fromthe original on 11 November 2020. Retrieved21 October 2009.

External links

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Ocean currents (rsmas.miami.edu)Archived 2022-01-20 at theWayback Machine
Ocean currents (nasa.gov)

Ocean currents andgyres

Currents

Arctic Ocean	East Greenland North Icelandic Norwegian Transpolar Drift Stream
Atlantic Ocean	Angola Antilles Azores Baffin Island Benguela Brazil Canary Cape Horn Caribbean East Greenland East Iceland Falkland Florida Guinea Gulf Stream Irminger Labrador Lomonosov Loop North Atlantic North Brazil North Equatorial Norwegian Portugal South Atlantic South Equatorial West Greenland West Spitsbergen
Indian Ocean	Agulhas Agulhas Return East Madagascar Equatorial Counter Indian Monsoon Indonesian Throughflow Leeuwin Madagascar Mozambique North Madagascar Somali South Equatorial West Australian
Pacific Ocean	Alaska Aleutian California Cromwell Davidson East Australian East Korea Warm Equatorial Counter Humboldt Indonesian Throughflow Kamchatka Kuroshio Mindanao North Equatorial North Korea Cold North Pacific Oyashio South Equatorial Tasman Front
Southern Ocean	Antarctic Circumpolar Tasman Outflow

Gyres

Major gyres	Indian Ocean Gyre North Atlantic Gyre South Atlantic Gyre North Pacific Gyre South Pacific Gyre
Other gyres	Beaufort Gyre Ross Gyre Weddell Gyre