Indian Ocean sources of Agulhas leakage
We examine the mean pathways, transit timescales, and transformation of waters flowing from the Pacific and the marginal seas through the Indian Ocean (IO) on their way toward the South Atlantic within a high-resolution ocean/sea-ice model. The model fields are analyzed from a Lagrangian perspective...
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ftoceanrep:oai:oceanrep.geomar.de:38080 2023-05-15T18:18:37+02:00 Indian Ocean sources of Agulhas leakage Durgadoo, Jonathan V. Rühs, Siren Biastoch, Arne Böning, Claus W. 2017-04-29 text https://oceanrep.geomar.de/id/eprint/38080/ https://oceanrep.geomar.de/id/eprint/38080/1/jgrc22263.pdf https://doi.org/10.1002/2016JC012676 en eng AGU (American Geophysical Union) Wiley https://oceanrep.geomar.de/id/eprint/38080/1/jgrc22263.pdf Durgadoo, J. V. , Rühs, S. , Biastoch, A. and Böning, C. W. (2017) Indian Ocean sources of Agulhas leakage. Open Access Journal of Geophysical Research: Oceans, 122 (4). pp. 3481-3499. DOI 10.1002/2016JC012676 <https://doi.org/10.1002/2016JC012676>. doi:10.1002/2016JC012676 info:eu-repo/semantics/openAccess Article PeerReviewed 2017 ftoceanrep https://doi.org/10.1002/2016JC012676 2023-04-07T15:33:26Z We examine the mean pathways, transit timescales, and transformation of waters flowing from the Pacific and the marginal seas through the Indian Ocean (IO) on their way toward the South Atlantic within a high-resolution ocean/sea-ice model. The model fields are analyzed from a Lagrangian perspective where water volumes are tracked as they enter the IO. The IO contributes 12.6 Sv to Agulhas leakage, which within the model is 14.1 ± 2.2 Sv, the rest originates from the South Atlantic. The Indonesian Through-flow constitutes about half of the IO contribution, is surface bound, cools and salinificates as it leaves the basin within 10–30 years. Waters entering the IO south of Australia are at intermediate depths and maintain their temperature-salinity properties as they exit the basin within 15–35 years. Of these waters, the contribution from Tasman leakage is 1.4 Sv. The rest stem from recirculation from the frontal regions of the Southern Ocean. The marginal seas export 1.0 Sv into the Atlantic within 15–40 years, and the waters cool and freshen on-route. However, the model's simulation of waters from the Gulfs of Aden and Oman are too light and hence overly influenced by upper ocean circulations. In the Cape Basin, Agulhas leakage is well mixed. On-route, temperature-salinity transformations occur predominantly in the Arabian Sea and within the greater Agulhas Current region. Overall, the IO exports at least 7.9 Sv from the Pacific to the Atlantic, thereby quantifying the strength of the upper cell of the global conveyor belt. Article in Journal/Newspaper Sea ice Southern Ocean OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Indian Pacific Southern Ocean Journal of Geophysical Research: Oceans 122 4 3481 3499 |
institution |
Open Polar |
collection |
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
op_collection_id |
ftoceanrep |
language |
English |
description |
We examine the mean pathways, transit timescales, and transformation of waters flowing from the Pacific and the marginal seas through the Indian Ocean (IO) on their way toward the South Atlantic within a high-resolution ocean/sea-ice model. The model fields are analyzed from a Lagrangian perspective where water volumes are tracked as they enter the IO. The IO contributes 12.6 Sv to Agulhas leakage, which within the model is 14.1 ± 2.2 Sv, the rest originates from the South Atlantic. The Indonesian Through-flow constitutes about half of the IO contribution, is surface bound, cools and salinificates as it leaves the basin within 10–30 years. Waters entering the IO south of Australia are at intermediate depths and maintain their temperature-salinity properties as they exit the basin within 15–35 years. Of these waters, the contribution from Tasman leakage is 1.4 Sv. The rest stem from recirculation from the frontal regions of the Southern Ocean. The marginal seas export 1.0 Sv into the Atlantic within 15–40 years, and the waters cool and freshen on-route. However, the model's simulation of waters from the Gulfs of Aden and Oman are too light and hence overly influenced by upper ocean circulations. In the Cape Basin, Agulhas leakage is well mixed. On-route, temperature-salinity transformations occur predominantly in the Arabian Sea and within the greater Agulhas Current region. Overall, the IO exports at least 7.9 Sv from the Pacific to the Atlantic, thereby quantifying the strength of the upper cell of the global conveyor belt. |
format |
Article in Journal/Newspaper |
author |
Durgadoo, Jonathan V. Rühs, Siren Biastoch, Arne Böning, Claus W. |
spellingShingle |
Durgadoo, Jonathan V. Rühs, Siren Biastoch, Arne Böning, Claus W. Indian Ocean sources of Agulhas leakage |
author_facet |
Durgadoo, Jonathan V. Rühs, Siren Biastoch, Arne Böning, Claus W. |
author_sort |
Durgadoo, Jonathan V. |
title |
Indian Ocean sources of Agulhas leakage |
title_short |
Indian Ocean sources of Agulhas leakage |
title_full |
Indian Ocean sources of Agulhas leakage |
title_fullStr |
Indian Ocean sources of Agulhas leakage |
title_full_unstemmed |
Indian Ocean sources of Agulhas leakage |
title_sort |
indian ocean sources of agulhas leakage |
publisher |
AGU (American Geophysical Union) |
publishDate |
2017 |
url |
https://oceanrep.geomar.de/id/eprint/38080/ https://oceanrep.geomar.de/id/eprint/38080/1/jgrc22263.pdf https://doi.org/10.1002/2016JC012676 |
geographic |
Indian Pacific Southern Ocean |
geographic_facet |
Indian Pacific Southern Ocean |
genre |
Sea ice Southern Ocean |
genre_facet |
Sea ice Southern Ocean |
op_relation |
https://oceanrep.geomar.de/id/eprint/38080/1/jgrc22263.pdf Durgadoo, J. V. , Rühs, S. , Biastoch, A. and Böning, C. W. (2017) Indian Ocean sources of Agulhas leakage. Open Access Journal of Geophysical Research: Oceans, 122 (4). pp. 3481-3499. DOI 10.1002/2016JC012676 <https://doi.org/10.1002/2016JC012676>. doi:10.1002/2016JC012676 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1002/2016JC012676 |
container_title |
Journal of Geophysical Research: Oceans |
container_volume |
122 |
container_issue |
4 |
container_start_page |
3481 |
op_container_end_page |
3499 |
_version_ |
1766195251673825280 |