There are two interesting cases.
1. A single source at the pole: Si = 0, Sq > 0. The mass flux in the western boundary layer is Tw = — So(1 + 1/A). If A = 1, then Tw = -2Sq, i.e., there is a constant mass flux going southward, half of which is just the recirculating water.
2. A source at the southwestern corner: Sq = 0, S1 > 0. The mass flux in the western boundary layer is Tw = —S1/A, i.e., there is a southward flux going toward the source.
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