Indian–Atlantic inter-ocean exchange: dynamics, estimation and impact
A b s t rac t. Interocean exchange of heat and salt around South Africa is thought to be a key link in the maintenance of the global overturning circulation of the ocean. It takes place at the Agulhas Retroflection, largely by the intermittent shedding of enormous rings that penetrate into the South...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.164.430 2023-05-15T13:39:14+02:00 Indian–Atlantic inter-ocean exchange: dynamics, estimation and impact W. P. M. De Ruijter L A. Biastoch S. S. Drijfhout J. R. E. Lutjeharms R. P. Matano W. Weijer The Pennsylvania State University CiteSeerX Archives 1999 application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.164.430 http://www.knmi.nl/publications/fulltexts/jgr99.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.164.430 http://www.knmi.nl/publications/fulltexts/jgr99.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://www.knmi.nl/publications/fulltexts/jgr99.pdf text 1999 ftciteseerx 2016-01-07T15:49:13Z A b s t rac t. Interocean exchange of heat and salt around South Africa is thought to be a key link in the maintenance of the global overturning circulation of the ocean. It takes place at the Agulhas Retroflection, largely by the intermittent shedding of enormous rings that penetrate into the South Atlantic Ocean. This makes it extremely hard to estimate the inter ocean fluxes. Estimates of direct Agulhas leakage from hydrographic and tracer data range between 2 and 10 Sv (1 Sv = 10 6 m3s'l). The average ring shedding frequency, determined from satellite information, is approximately six rings per year. Their associated interocean volume transport is between 0.5 and 1.5 Sv per ring. A number of Agulhas rings have been observed to cross the South Atlantic. They decay exponentially to less than half their initial size (measured by their available potential energy) within 1000 km from the shedding region. Consequently, most of their properties mix into the surroundings of the Benguela region, probably feeding directly into the upper (warm) limb of the global thermohaline circulation. The most recent observationsuggesthat in the present situation Agulhas water and Antarctic Intermediate Water are about equally important sources for the Benguela Current. Variations in the strength of these may lead to anomaloustratification and stability of the Atlantic at decadal and longer Text Antarc* Antarctic South Atlantic Ocean Unknown Antarctic Indian |
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English |
description |
A b s t rac t. Interocean exchange of heat and salt around South Africa is thought to be a key link in the maintenance of the global overturning circulation of the ocean. It takes place at the Agulhas Retroflection, largely by the intermittent shedding of enormous rings that penetrate into the South Atlantic Ocean. This makes it extremely hard to estimate the inter ocean fluxes. Estimates of direct Agulhas leakage from hydrographic and tracer data range between 2 and 10 Sv (1 Sv = 10 6 m3s'l). The average ring shedding frequency, determined from satellite information, is approximately six rings per year. Their associated interocean volume transport is between 0.5 and 1.5 Sv per ring. A number of Agulhas rings have been observed to cross the South Atlantic. They decay exponentially to less than half their initial size (measured by their available potential energy) within 1000 km from the shedding region. Consequently, most of their properties mix into the surroundings of the Benguela region, probably feeding directly into the upper (warm) limb of the global thermohaline circulation. The most recent observationsuggesthat in the present situation Agulhas water and Antarctic Intermediate Water are about equally important sources for the Benguela Current. Variations in the strength of these may lead to anomaloustratification and stability of the Atlantic at decadal and longer |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
W. P. M. De Ruijter L A. Biastoch S. S. Drijfhout J. R. E. Lutjeharms R. P. Matano W. Weijer |
spellingShingle |
W. P. M. De Ruijter L A. Biastoch S. S. Drijfhout J. R. E. Lutjeharms R. P. Matano W. Weijer Indian–Atlantic inter-ocean exchange: dynamics, estimation and impact |
author_facet |
W. P. M. De Ruijter L A. Biastoch S. S. Drijfhout J. R. E. Lutjeharms R. P. Matano W. Weijer |
author_sort |
W. P. M. De Ruijter |
title |
Indian–Atlantic inter-ocean exchange: dynamics, estimation and impact |
title_short |
Indian–Atlantic inter-ocean exchange: dynamics, estimation and impact |
title_full |
Indian–Atlantic inter-ocean exchange: dynamics, estimation and impact |
title_fullStr |
Indian–Atlantic inter-ocean exchange: dynamics, estimation and impact |
title_full_unstemmed |
Indian–Atlantic inter-ocean exchange: dynamics, estimation and impact |
title_sort |
indian–atlantic inter-ocean exchange: dynamics, estimation and impact |
publishDate |
1999 |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.164.430 http://www.knmi.nl/publications/fulltexts/jgr99.pdf |
geographic |
Antarctic Indian |
geographic_facet |
Antarctic Indian |
genre |
Antarc* Antarctic South Atlantic Ocean |
genre_facet |
Antarc* Antarctic South Atlantic Ocean |
op_source |
http://www.knmi.nl/publications/fulltexts/jgr99.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.164.430 http://www.knmi.nl/publications/fulltexts/jgr99.pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
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1766116279060529152 |