A weaker Agulhas Current leads to more Agulhas leakage
A weaker Agulhas Current leads to more Agulhas leakage
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DOI：
10.1029/2008gl036614
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发表时间：
2009-02
影响因子：
5.2
通讯作者：
E. van Sebille;A. Biastoch;P. V. van Leeuwen;W. D. de Ruijter
中科院分区：
文献类型：
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作者：
E. van Sebille;A. Biastoch;P. V. van Leeuwen;W. D. de Ruijter
通过在1/10度双向嵌套海洋模式中模拟拉格朗日漂流物轨迹，构建了Agulhas区域输送的时间序列。使用这些长达34年的时间序列表明，较小的（较大的）阿古拉斯电流传输导致较大的（较小的）印度洋-大西洋间的交换。当输送量较低时，阿古拉斯海流从非洲大陆坡向下游分离。此外，较低的惯性抑制了反气旋涡旋的产生。这两种效应导致了阿古拉斯回射向西移动，增强了阿古拉斯泄漏。在该模型中，32°S时Agulhas电流输送减少1 Sv，导致Agulhas泄漏增加0.7 ± 0.2 Sv。
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.