Ww

Figure 6.9 (overleaf) shows the variation with latitude of various contributions in the oceanic heat budget in July and January, Part (a} relates to the radiative terms. and 4V and part lb) to the turbulent lluxes'. Qh and Qc.

According in f igure (vOib), whal is the approximate \alue for Him en 's ratio (t) at the Equator. 121 at about 70 N in winter?

According to Figure 6.9(b). ai the Fquatoi. Bow en's ratio is about 8/80 or about 0.1: at about 70cN in winter it is about 60/90 or -0.7. Put another way. Qu ranges from ahoul one-ienth of Qc in low latitudes, up to aboul two-thirds of (or more) at high latitudes.

Part (c) of Figure 6.9 shows the net re.sull ol the gains and losses of heat in la) and (b). Note that within 10-15° of the Equator there is a net heat gain all y ear, but outside these latitudes the sea-surface in the winter hemisphere experiences a net loss. This is show n even more dramatically in Figure 6.10, which also demonstrates how different the patterns of winter heat loss are in the iwo hemispheres

Figure 6.9 The variation with latitude of the mean values (per unit area) for heat-budget terms relating to heat transfer across the air-sea interface. In each case, the full curve is for January and the broken curve is for July.

(a) The terms for radiative gain and loss (Qs and Qb);

(b) the terms relating to the 'turbulent fluxes', Oh (sensible heat, brick-red curve) and Qe (latent heat, blue curve);

latitude

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