Meteorology for Air Pollution Control Engineers8

Meteorology for Air Pollution Control Engineers8 - left. n...

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1 n Close to the surface, friction between the moving air and  the ground or ocean makes the picture more complicated. n Pressure-gradient acceleration is inversely proportional to  air density, which means that if the horizontal pressure  gradient is the same at high altitude as at low (which it  practically is) then:
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2 (1) The acceleration will be grater at  higher altitudes than  at low because air  density declines with altitude. (2) High altitude winds will be faster than  low-altitude  winds, which they generally  are.
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3 n Returning to Fig. 5.2, in the Northern Hemisphere, the wind  arrows curve to the right, and in the Southern Hemisphere to the 
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Unformatted text preview: left. n The result is that near the equator the surface wind is from the east (trade winds), in the midlatitudes the surface wind is from the west (prevailing westerlies), and in the polar regions the surface wind is from the east (polar easterlies). 4 2.3 The Influence of the Ground and the Sea n Major mountain ranges like the Himalayas, Rockies, Alps, and Andes are major barriers to horizontal winds, and regularly have very different climates on one side than on the other. n Even smaller mountains and valleys can strongly influence wind direction, though on a smaller scale....
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This note was uploaded on 10/14/2011 for the course CIVL CIVL345 taught by Professor Hsinchu during the Spring '11 term at SUNY College of Environmental Science and Forestry.

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Meteorology for Air Pollution Control Engineers8 - left. n...

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