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Which indicator is more useful for distinguishing monsoon rainfall from purely convectional rainfall?

Answer and explanation

Correct answer: A broad seasonal wind system and entry of marine moisture

The direct answer is A: a broad seasonal wind system and the entry of marine moisture. Monsoon rainfall is not identified merely by seeing clouds or rain. It is a large regional and seasonal circulation. In summer, heated land helps draw moisture-bearing winds from the sea. These winds travel over a wide area and produce rainfall during a season. Therefore, the reasoning is: seasonal pressure difference leads to seasonal winds; winds bring ocean moisture; moisture rises and forms rain. Option A gives both important clues. Option B, only local afternoon heating, can produce convectional showers but does not prove a monsoon. Option C, cloud colour, is not a dependable scientific indicator of the source or season of rain. Option D, night temperature, may vary for many reasons and does not identify monsoon circulation. A useful exam cue is: monsoon means seasonal regional winds plus moisture from the sea, whereas purely convectional rain is mainly caused by local heating.

Related tags

ClimateIndian MonsoonRainfall Type

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