Meteorology for Air Pollution Control Engineers32

Meteorology for Air Pollution Control Engineers32 -...

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1 5. Temperature Inversions n There are four ways to produce an inversion: (1) cool a layer of air from below (2) heat a layer of air from above (3) flow a layer of warm air over a layer of  cold air  (4) flow a layer of cold air under a layer of  warm air 
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2 n The first, cooling from below, is the very common  radiation inversion discussed in section 3.4 and Fig. 5.7. n Secondly, heating an air layer from above can occur if a  cloud layer absorbs incoming solar energy, but it most  often occurs when there is a high pressure region (common  in summer between storms) in which there is a slow net 
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Unformatted text preview: downward flow of air and light winds. 3 n The sinking air mass will increase in temperature at the adiabatic lapse rate and often become warmer than the air below it. n The result is an elevated inversion, also called subsidence inversion or inversion aloft. n These normally form 1,500 to 15,000 ft above the ground. 4 n Thirdly, nighttime flow of cold air down valleys often leads to inversions at the bottom of the valley, with cold air flowing in under warmer air. n In the winter this nighttime flow of cold air causes drainage inversions....
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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 Engineers32 -...

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