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LONGITUDE
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Figure 6.15 The trade wind systems of the world (a) in April and (b) in October. The isopleths are in terms of relative constancy
of wind direction and enclose shaded areas where 50 per cent, 70 per cent and 90 per cent of all winds blow from the
predominant quadrant, with speeds above 3.3m s -1 .
Source: After Crowe (1971)
 
 
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