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easterlies

subpolar low westerlies

30* Trade Winds

ITC2 equatorial low

(c) Schematic diagram to show the spiral circulation patterns of which the Trade Winds form the surface expression; the north-south component of this spiral circulation (see right-hand side) is known as the Hadley circulation or 'Hadley cells' (also shown on Figure 2.2(a)).

Equator

[a) JULY KEY mean position most frequent prevailing wind direction oflTCZ ' wind direction (>50% of observations)

(b) JANUARY

[a) JULY KEY mean position most frequent prevailing wind direction oflTCZ ' wind direction (>50% of observations)

(b) JANUARY

knots

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