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| Titel |
Relating Agulhas leakage to the Agulhas Current retroflection location |
| VerfasserIn |
E. Sebille, C. N. Barron, A. Biastoch, P. J. Leeuwen, F. C. Vossepoel, W. P. M. Ruijter |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1812-0784
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| Digitales Dokument |
URL |
| Erschienen |
In: Ocean Science ; 5, no. 4 ; Nr. 5, no. 4 (2009-11-03), S.511-521 |
| Datensatznummer |
250002728
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| Publikation (Nr.) |
 copernicus.org/os-5-511-2009.pdf |
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| Zusammenfassung |
| The relation between the Agulhas Current retroflection location and the
magnitude of Agulhas leakage, the transport of water from the Indian to the
Atlantic Ocean, is investigated in a high-resolution numerical ocean model.
Sudden eastward retreats of the Agulhas Current retroflection loop are
linearly related to the shedding of Agulhas rings, where larger retreats
generate larger rings. Using numerical Lagrangian floats a 37 year time
series of the magnitude of Agulhas leakage in the model is constructed. The
time series exhibits large amounts of variability, both on weekly and annual
time scales. A linear relation is found between the magnitude of Agulhas
leakage and the location of the Agulhas Current retroflection, both binned to
three month averages. In the relation, a more westward location of the
Agulhas Current retroflection corresponds to an increased transport from the
Indian Ocean to the Atlantic Ocean. When this relation is used in a linear
regression and applied to almost 20 years of altimetry data, it yields a best
estimate of the mean magnitude of Agulhas leakage of 13.2 Sv. The early
retroflection of 2000, when Agulhas leakage was probably halved, can be
identified using the regression. |
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