Summary of Abstract Submission

Abstract Submission No. IO50-04-0013PresentationPoster


Dewi le Bars1, Henk A. Dijkstra **2, Will P. M. de Ruijter2

1 Utrecht University , Netherlands
2 Utrecht University, Netherlands


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, one involving the large scale momentum balance and the other involving local instabilities.