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January
80°N
60°
40°
25
200
20°
150
1 50
20°
40°
25
50
25
60°S
160°W
140°
120°
100°
80°
60°
40°
20°
20°
40°
60°
80°
100°
120°
140°
160°
180°E
July
80°N
75
60°
50
25
40°
10
20°
75
100
7 5
150
150
20°
40°
60°S
160°W
140°
120°
100°
80°
60°
40°
20°
20°
40°
60°
80°
100°
120°
140°
160°
180°E
Figure 4.6 Mean evaporation (mm) for January and July (after M. I. Budyko, Heat Budget Atlas of the Earth, 1958).
over the oceans in view of the unlimited avail-
ability of water, and on a seasonal basis the
maximum rates occur in January over the western
Pacific and Atlantic, where cold continental air
blows across warm ocean currents. On an annual
basis, maximum oceanic losses occur about
15-20
S, in the belts of the constant
Trade Winds (see Figures 4.5B and 4.6 ). The
°
N and 10-20
°
 
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