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Relating Agulhas leakage to the Agulhas Current retroflection\ud location

By E. Van Sebille, C.N. Barron, A biastoch, P. J. Van Leeuwen, F.C. Vossepoel and W.P.M. De Ruijter


The relation between the Agulhas Current\ud retroflection location and the magnitude of Agulhas leakage,\ud the transport of water from the Indian to the Atlantic Ocean,\ud is investigated in a high-resolution numerical ocean model.\ud Sudden eastward retreats of the Agulhas Current retroflection\ud loop are linearly related to the shedding of Agulhas rings,\ud where larger retreats generate larger rings. Using numerical\ud Lagrangian floats a 37 year time series of the magnitude of\ud Agulhas leakage in the model is constructed. The time series\ud exhibits large amounts of variability, both on weekly and annual\ud time scales. A linear relation is found between the magnitude\ud of Agulhas leakage and the location of the Agulhas\ud Current retroflection, both binned to three month averages.\ud In the relation, a more westward location of the Agulhas Current\ud retroflection corresponds to an increased transport from\ud the Indian Ocean to the Atlantic Ocean. When this relation\ud is used in a linear regression and applied to almost 20 years\ud of altimetry data, it yields a best estimate of the mean magnitude\ud of Agulhas leakage of 13.2 Sv. The early retroflection\ud of 2000, when Agulhas leakage was probably halved, can be\ud identified using the regression

Publisher: European Geosciences Union
Year: 2009
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