Impact of the Indonesian Throughflow on Agulhas leakage
Using ocean models of different complexity we show that opening the Indonesian Passage between the Pacific and the Indian oceans increases the input of Indian Ocean water into the South Atlantic via the Agulhas leakage. In a strongly eddying global ocean model this response results from an increased...
| Main Authors: | , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2013-09-01
|
| Series: | Ocean Science |
| Online Access: | http://www.ocean-sci.net/9/773/2013/os-9-773-2013.pdf |
| _version_ | 1818989897204105216 |
|---|---|
| author | D. Le Bars H. A. Dijkstra W. P. M. De Ruijter |
| author_facet | D. Le Bars H. A. Dijkstra W. P. M. De Ruijter |
| author_sort | D. Le Bars |
| collection | DOAJ |
| description | Using ocean models of different complexity we show that opening the Indonesian Passage between the Pacific and the Indian oceans increases the input of Indian Ocean water into the South Atlantic via the Agulhas leakage. In a strongly eddying global ocean model this response results from an increased Agulhas Current transport and a constant proportion of Agulhas retroflection south of Africa. The leakage increases through an increased frequency of ring shedding events. In an idealized two-layer and flat-bottom eddy resolving model, the proportion of the Agulhas Current transport that retroflects is (for a wide range of wind stress forcing) not affected by an opening of the Indonesian Passage. Using a comparison with a linear model and previous work on the retroflection problem, the result is explained as a balance between two mechanisms: decrease retroflection due to large-scale momentum balance and increase due to local barotropic/baroclinic instabilities. |
| first_indexed | 2024-12-20T19:45:46Z |
| format | Article |
| id | doaj.art-390c918bed0d4c2e957f08e1e98201d7 |
| institution | Directory Open Access Journal |
| issn | 1812-0784 1812-0792 |
| language | English |
| last_indexed | 2024-12-20T19:45:46Z |
| publishDate | 2013-09-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Ocean Science |
| spelling | doaj.art-390c918bed0d4c2e957f08e1e98201d72022-12-21T19:28:26ZengCopernicus PublicationsOcean Science1812-07841812-07922013-09-019577378510.5194/os-9-773-2013Impact of the Indonesian Throughflow on Agulhas leakageD. Le BarsH. A. DijkstraW. P. M. De RuijterUsing ocean models of different complexity we show that opening the Indonesian Passage between the Pacific and the Indian oceans increases the input of Indian Ocean water into the South Atlantic via the Agulhas leakage. In a strongly eddying global ocean model this response results from an increased Agulhas Current transport and a constant proportion of Agulhas retroflection south of Africa. The leakage increases through an increased frequency of ring shedding events. In an idealized two-layer and flat-bottom eddy resolving model, the proportion of the Agulhas Current transport that retroflects is (for a wide range of wind stress forcing) not affected by an opening of the Indonesian Passage. Using a comparison with a linear model and previous work on the retroflection problem, the result is explained as a balance between two mechanisms: decrease retroflection due to large-scale momentum balance and increase due to local barotropic/baroclinic instabilities.http://www.ocean-sci.net/9/773/2013/os-9-773-2013.pdf |
| spellingShingle | D. Le Bars H. A. Dijkstra W. P. M. De Ruijter Impact of the Indonesian Throughflow on Agulhas leakage Ocean Science |
| title | Impact of the Indonesian Throughflow on Agulhas leakage |
| title_full | Impact of the Indonesian Throughflow on Agulhas leakage |
| title_fullStr | Impact of the Indonesian Throughflow on Agulhas leakage |
| title_full_unstemmed | Impact of the Indonesian Throughflow on Agulhas leakage |
| title_short | Impact of the Indonesian Throughflow on Agulhas leakage |
| title_sort | impact of the indonesian throughflow on agulhas leakage |
| url | http://www.ocean-sci.net/9/773/2013/os-9-773-2013.pdf |
| work_keys_str_mv | AT dlebars impactoftheindonesianthroughflowonagulhasleakage AT hadijkstra impactoftheindonesianthroughflowonagulhasleakage AT wpmderuijter impactoftheindonesianthroughflowonagulhasleakage |