( ïïv = 0 1

i S^

uv <0


V üv = 0 A

1 y y

FIGURE 8.14. Circular eddies on the left are unable to affect a meridional transfer of momentum. The eddies on the right, however, by virtue of their ''banana shape,'' transfer westerly momentum northwards south of, and southwards north of, the midline. Weather systems transport westerly momentum from the tropics (u5 > 0) toward higher latitudes, as required in Fig. 8.12 (right), by ''trailing'' their troughs down in to the tropics (see, e.g., the H2O distribution shown in Fig. 3), as in the southern half of the ''banana-shaped'' eddy sketched on the right.

with drag on the near-surface westerlies—is located in middle latitudes and balances the supply of westerly momentum via eddy transport.

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