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Why south east trade winds change direction and become south west monsoon wind after crossing equator at high speed?
Wiki User
∙ 15y ago
becoes bobo The Coriolis Force is the reason for this (which as mentioned above is subsequent to the rotation of the earth). In the Southern Hemisphere, the Coriolis deflects air motion (wind flow) to the left (to the right in the Northern Hemisphere). The extent of deflection, I.e. the strength of the Coriolis Force is proportional to the wind speed (via the Pressure Gradient Force), increasing as wind speed increases. The effect of the Coriolis force increases with Latitude, to a ZERO effect at the equator. During Australia's Winter months, The Intertropical Convergence Zone (ITCZ) moves northward, to about 10-15 degrees north of the equator (in the continental regions). The ITCZ is where NE and SE trade winds converge, and thus the SE trade winds must cross the equator, and thus enter the Northern Hemisphere. Subsequently, due Coriolis force in the Northern Hemisphere, the SE trade winds are deflected to the right to become SW trade winds. NOTE: the opposite happens in Australia's Summer months with the NE wind regimes, which are deflected to the left to become the NW Monsoon. Regards, Nigel Brown
Wiki User
∙ 15y ago
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