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Global wind patterns: Winds are named by the direction from which they blow. The globe is encircled by six major wind belts, three in each hemisphere.From pole to equator, they are the polar easterlies, the westerlies, and the trade winds. All six belts move north in the northern summer and south in the northern winter.cean Gyre: The fact that the westerlies and trade winds blow in opposite directions and that the continents prevent water from circling the globe contributes to the formation of circular ocean currents, clockwise in the northern hemisphere and counterclockwise in the southern hemisphere.
Trade Winds Trade winds were introduced in Chapter 1 (Global weather patterns) as the equatorward blowing part of the Hadley cell. Because many cruising boats spend a lot of time in the trade wind region, some more detailed information is given in this chapter. Typical trade wind characteristics. The strength of the trade winds - like all the winds in the world - is predominantly determined by pressure gradient. Because the pressure of the equatorial trough, or ITCZ, is relatively stable at around 1008-1012 hPa, the strength of the trade winds is mostly determined by the strength and location of the subtropical high pressure.