L

where TS = g' (h2e — h0) /2fs and TN (specified) are the volumetric flux at the southern and northern ends of the western boundary (Fig. 5.193). This is a time-delay equation that describes the time evolution of the thermocline thickness along the eastern boundary. As shown clearly, it takes one month for the signal to arrive at the equator. At this time, most of the water is carried out eastward by the equator-bounded Kelvin waves (Fig. 5.193a). The western boundary current is gradually established after the long Rossby waves radiated from the eastern boundary arrive at the western boundary, as shown in Figure 5.193b.

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