Mesoscale perturbations control inter-ocean exchange south of Africa
The quantification of inter-ocean leakage from the South Indian to the South Atlantic Ocean is an important measure for the role of the Agulhas system in the global thermohaline circulation. To explore the specific role of mesoscale variability (such as Agulhas rings and Mozambique eddies) in this p...
Published in: | Geophysical Research Letters |
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Language: | English |
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AGU (American Geophysical Union)
2008
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Online Access: | https://oceanrep.geomar.de/id/eprint/4025/ https://oceanrep.geomar.de/id/eprint/4025/1/Biastoch_et_al-2008-Geophysical_Research_Letters.pdf https://oceanrep.geomar.de/id/eprint/4025/2/grl25008-sup-0001-readme.txt https://oceanrep.geomar.de/id/eprint/4025/3/grl25008-sup-0002-fs01.tif https://oceanrep.geomar.de/id/eprint/4025/4/grl25008-sup-0003-ms01.mpg https://doi.org/10.1029/2008GL035132 |
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ftoceanrep:oai:oceanrep.geomar.de:4025 2023-05-15T17:53:48+02:00 Mesoscale perturbations control inter-ocean exchange south of Africa Biastoch, Arne Lütjeharms, J. R. E. Böning, Claus W. Scheinert, Markus 2008-10-18 text image video https://oceanrep.geomar.de/id/eprint/4025/ https://oceanrep.geomar.de/id/eprint/4025/1/Biastoch_et_al-2008-Geophysical_Research_Letters.pdf https://oceanrep.geomar.de/id/eprint/4025/2/grl25008-sup-0001-readme.txt https://oceanrep.geomar.de/id/eprint/4025/3/grl25008-sup-0002-fs01.tif https://oceanrep.geomar.de/id/eprint/4025/4/grl25008-sup-0003-ms01.mpg https://doi.org/10.1029/2008GL035132 en eng AGU (American Geophysical Union) https://oceanrep.geomar.de/id/eprint/4025/1/Biastoch_et_al-2008-Geophysical_Research_Letters.pdf https://oceanrep.geomar.de/id/eprint/4025/2/grl25008-sup-0001-readme.txt https://oceanrep.geomar.de/id/eprint/4025/3/grl25008-sup-0002-fs01.tif https://oceanrep.geomar.de/id/eprint/4025/4/grl25008-sup-0003-ms01.mpg Biastoch, A. , Lütjeharms, J. R. E., Böning, C. W. and Scheinert, M. (2008) Mesoscale perturbations control inter-ocean exchange south of Africa. Open Access Geophysical Research Letters, 35 (L20602). DOI 10.1029/2008GL035132 <https://doi.org/10.1029/2008GL035132>. doi:10.1029/2008GL035132 info:eu-repo/semantics/openAccess Article PeerReviewed 2008 ftoceanrep https://doi.org/10.1029/2008GL035132 2023-04-07T14:48:44Z The quantification of inter-ocean leakage from the South Indian to the South Atlantic Ocean is an important measure for the role of the Agulhas system in the global thermohaline circulation. To explore the specific role of mesoscale variability (such as Agulhas rings and Mozambique eddies) in this process a high-resolution model (based on NEMO-ORCA) for the Agulhas region has been set up. It is nested into a global coarse-resolution model. The high-resolution nest captures all salient features of the greater Agulhas region, including the upstream perturbations of the Agulhas Current and Natal Pulses along the African coast. A comparison of the inter-ocean exchange in the high-resolution nest with its coarse resolution counterpart reveals that the latter significantly over-estimates the amount of water flowing into the Atlantic Ocean, demonstrating the need to explicitly simulate the mesoscale features. A sensitivity experiment that excludes the upstream perturbations revealed no difference in the amount of inter-ocean exchange. However, the realistic representation of Agulhas rings and their drift path into the South Atlantic depends on the simulation of those upstream perturbations. Article in Journal/Newspaper Orca South Atlantic Ocean OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Indian Geophysical Research Letters 35 20 |
institution |
Open Polar |
collection |
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
op_collection_id |
ftoceanrep |
language |
English |
description |
The quantification of inter-ocean leakage from the South Indian to the South Atlantic Ocean is an important measure for the role of the Agulhas system in the global thermohaline circulation. To explore the specific role of mesoscale variability (such as Agulhas rings and Mozambique eddies) in this process a high-resolution model (based on NEMO-ORCA) for the Agulhas region has been set up. It is nested into a global coarse-resolution model. The high-resolution nest captures all salient features of the greater Agulhas region, including the upstream perturbations of the Agulhas Current and Natal Pulses along the African coast. A comparison of the inter-ocean exchange in the high-resolution nest with its coarse resolution counterpart reveals that the latter significantly over-estimates the amount of water flowing into the Atlantic Ocean, demonstrating the need to explicitly simulate the mesoscale features. A sensitivity experiment that excludes the upstream perturbations revealed no difference in the amount of inter-ocean exchange. However, the realistic representation of Agulhas rings and their drift path into the South Atlantic depends on the simulation of those upstream perturbations. |
format |
Article in Journal/Newspaper |
author |
Biastoch, Arne Lütjeharms, J. R. E. Böning, Claus W. Scheinert, Markus |
spellingShingle |
Biastoch, Arne Lütjeharms, J. R. E. Böning, Claus W. Scheinert, Markus Mesoscale perturbations control inter-ocean exchange south of Africa |
author_facet |
Biastoch, Arne Lütjeharms, J. R. E. Böning, Claus W. Scheinert, Markus |
author_sort |
Biastoch, Arne |
title |
Mesoscale perturbations control inter-ocean exchange south of Africa |
title_short |
Mesoscale perturbations control inter-ocean exchange south of Africa |
title_full |
Mesoscale perturbations control inter-ocean exchange south of Africa |
title_fullStr |
Mesoscale perturbations control inter-ocean exchange south of Africa |
title_full_unstemmed |
Mesoscale perturbations control inter-ocean exchange south of Africa |
title_sort |
mesoscale perturbations control inter-ocean exchange south of africa |
publisher |
AGU (American Geophysical Union) |
publishDate |
2008 |
url |
https://oceanrep.geomar.de/id/eprint/4025/ https://oceanrep.geomar.de/id/eprint/4025/1/Biastoch_et_al-2008-Geophysical_Research_Letters.pdf https://oceanrep.geomar.de/id/eprint/4025/2/grl25008-sup-0001-readme.txt https://oceanrep.geomar.de/id/eprint/4025/3/grl25008-sup-0002-fs01.tif https://oceanrep.geomar.de/id/eprint/4025/4/grl25008-sup-0003-ms01.mpg https://doi.org/10.1029/2008GL035132 |
geographic |
Indian |
geographic_facet |
Indian |
genre |
Orca South Atlantic Ocean |
genre_facet |
Orca South Atlantic Ocean |
op_relation |
https://oceanrep.geomar.de/id/eprint/4025/1/Biastoch_et_al-2008-Geophysical_Research_Letters.pdf https://oceanrep.geomar.de/id/eprint/4025/2/grl25008-sup-0001-readme.txt https://oceanrep.geomar.de/id/eprint/4025/3/grl25008-sup-0002-fs01.tif https://oceanrep.geomar.de/id/eprint/4025/4/grl25008-sup-0003-ms01.mpg Biastoch, A. , Lütjeharms, J. R. E., Böning, C. W. and Scheinert, M. (2008) Mesoscale perturbations control inter-ocean exchange south of Africa. Open Access Geophysical Research Letters, 35 (L20602). DOI 10.1029/2008GL035132 <https://doi.org/10.1029/2008GL035132>. doi:10.1029/2008GL035132 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1029/2008GL035132 |
container_title |
Geophysical Research Letters |
container_volume |
35 |
container_issue |
20 |
_version_ |
1766161503607586816 |