9:18:19.docx - MSC101 1 Global wind and humidity patterns are driven by solar forcing and earth rotation a Inter tropical convergence zone(ITCZ where

9:18:19.docx - MSC101 1 Global wind and humidity patterns...

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MSC101 1. Global wind and humidity patterns are driven by solar forcing and earth rotation a. Inter tropical convergence zone (ITCZ) where warm air rises b. Trade winds subside at latitudes c. Lot of solar radiation and evaporation d. Polar- tropical air and mid-latitude air i. Frequent participation 1. Warm air with cold air pushing like wedge underneath it e. Winds don’t go north and south i. Rotation of earth 1. Trade winds bent by Coriolis a. Changes in direction from north and south hemispheres 2. Descending dry air near 30 degrees (north and south of the equator) leads to excess evaporation, deserts on land, and high salinities at sea a. Maximum evaporation and minimum precipitation in tropic latitudes b. Mid-latitudes show maximum of precipitation c. Excess precipitation near the equator and in mid-latitudes with rising air 3. Position of ITCZ moves north and south with the seasons. a. High pressures near 30 degrees leads to excess evaporation i. Substantial seasonal changes 4.
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