Ekman drift

Ekman Drift

Figure 4.7. Schematic of the flow in the Antarctic circumpolar current (Acc). The wind predomi

Ekman drift

Figure 4.7. Schematic of the flow in the Antarctic circumpolar current (Acc). The wind predomi nantly blows in a zonal direction around the Antarctic continent, generating an Ekman flow toward the north and a net loss of water from the channel. The water returns at depth, generating a deep overturning circulation, as illustrated in the bottom panel of figure 4.6.

and moves southward across the equator, upwelling in the Acc. Unlike the mixing-maintained circulation described in the previous section, no mixing is required to draw up the deep water; rather, the wind itself pumps the deep water up.

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