A weaker Agulhas Current leads to more Agulhas leakage

Time series of transports in the Agulhas region have been constructed by simulating Lagrangian drifter trajectories in a 1/10 degree two‐way nested ocean model. Using these 34 year long time series it is shown that smaller (larger) Agulhas Current transport leads to larger (smaller) Indian‐Atlantic...

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Bibliographic Details
Published in:Geophysical research letters 2009-02, Vol.36 (3), p.n/a
Main Authors: van Sebille, E., Biastoch, A., van Leeuwen, P. J., de Ruijter, W. P. M.
Format: Article
Language:English
Subjects:
Agulhas leakage
Continental slope
Earth sciences
Earth, ocean, space
Exact sciences and technology
Marine
Physical oceanography
Time series
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Summary:Time series of transports in the Agulhas region have been constructed by simulating Lagrangian drifter trajectories in a 1/10 degree two‐way nested ocean model. Using these 34 year long time series it is shown that smaller (larger) Agulhas Current transport leads to larger (smaller) Indian‐Atlantic inter‐ocean exchange. When transport is low, the Agulhas Current detaches farther downstream from the African continental slope. Moreover, the lower inertia suppresses generation of anti‐cyclonic vorticity. These two effects cause the Agulhas retroflection to move westward and enhance Agulhas leakage. In the model a 1 Sv decrease in Agulhas Current transport at 32°S results in a 0.7 ± 0.2 Sv increase in Agulhas leakage.
ISSN:0094-8276
1944-8007
DOI:10.1029/2008GL036614