Discuss the climatic controls that produce the marked seasonal variation in precipitation in areas such as India and Southeast Asia
What will be the ideal response?
ANSWER: In many areas (especially within India and Southeast Asia), the marked variation in precipitation is associated with the monsoon—the seasonal reversal of winds. The Asian monsoon circulation is due in part to differential heating between landmasses and oceans. During winter in the Northern Hemisphere, winds blow outward, away from a cold, shallow high-pressure area centered over continental Siberia. These downslope, relatively dry northeasterly winds from the interior provide India and Southeast Asia with generally fair weather and the dry season. In summer, the wind-flow pattern reverses as air flows into a developing thermal low over the continental interior. Humid air from the water rises and condenses, resulting in heavy rain and the wet season.
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