Meteorology for Air Pollution Control Engineers29

Meteorology for Air Pollution Control Engineers29 -...

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1 n On a clear night the ground is cooled by radiation to  outer space, and a layer of air forms adjacent to it that is  colder and hence more dense than the air above it. n If the ground is not flat, then this more dense layer will  tend to flow downhill.
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2 n In any valley cold air flows down to the bottom, and  then the collected cold air flows down the valley the same 
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Unformatted text preview: direction that the stream or river in the valley flows. n During the day the opposite occurs. n But the upvalley daytime flow is generally not as strong as the night flow. 3 n Mountains can act as barriers to low-level winds. n The problem is compounded by the effect of the nearby ocean. n Fig. 5.13 (next slide) shows this effect....
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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 Engineers29 -...

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