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Observations of upper-ocean western boundary current (WBC) transports reveal asymmetries between the Northern and the Southern Hemispheres of the Atlantic Ocean. To find out what mechanism might cause these asymmetries the linearized steady-state vorticity equation is applied to the interior of a layer of constant thickness representing the upper Atlantic Ocean. WBC transports are then required to balance the interior volume flux deficit. The ocean is forced by climatological wind stress at the surface; thermohaline forcing is introduced by vertical motion at the lower boundary. A series of model runs using selected combinations of different basin geometries, wind stress fields, and thermohaline forcing patterns yields the following results: asymmetries of WBC transports cannot be explained by the topography shape of coastlines. The wind stress causes 12 Sv (Sv ≡ 1 × 106 m3 s −1) cross-equatorial transport to the north but it cannot account for the other WBC asymmetries. These can be explained by...

The Asymmetry of Western Boundary Currents in the Upper Atlantic Ocean