Why most of the world's deserts are located in the western margins of continents in the subtropics?
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Because of the "Rain Shadow" effect.
A rain shadow is an area of dry land that lies on the leeward (or downwind) side of a mountain. Winds carry air masses up and over the mountain range and as the air is driven upward over the mountain, falling temperatures cause the air to lose much of its moisture as precipitation. Upon reaching the leeward side of the mountain, the dry air descends and picks up any available moisture from the landscape below. The resulting profile of precipitation across the mountain is such that rainfall and moist air prevails on the windward side of a mountain range while arid, moisture-poor air prevails on the leeward side of the mountain range.
And what is the 'rain shadow' effect?? plz tell in brief.
The world 's desert are located in the western margin of continents in the subtropics because:
- The deserts lie in the belt of the trade winds which blow from northeast in the northern hemisphere and southeast in the southern hemisphere. There coriolis fore, the direction of the trade winds is deflected from the east to west. These winds shed their moisture on the eastern margins of the continents and by the time they reach the west they have lost their moisture.
- These deserts fall on the leeward side of the mountains and hence, get less rainfall.
nyc yr.. thnx i filled my notebok..
it is because of cold ocean current
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