Meteorology for Air Pollution Control Engineers18

Meteorology for Air Pollution Control Engineers18 - rapidly...

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1 n In the few hundred feet closest to the ground the lapse  rate is even grater than the adiabatic lapse rate, and the  air is unstable. n By sunset there will be a weak inversion close to the  ground. All night this inversion will grow in strength and  size, until by dawn of the next day.
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2 n In the situation sketched as midafternoon in Fig. 5.7, if  there are updrafts, there must be downdrafts too, because  the overall motion of the atmosphere has only a small  vertical component. n Nature seems to prefer to have a few small columns of 
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Unformatted text preview: rapidly rising, fairly hot air surrounded by a large area of slowly falling, slightly cooled air. 3 n One can see this phenomenon in the form of a dust devil, commonly seen in all desert areas on sunny afternoons, as sketched in Fig. 5.8 (next slide). n As the air flows in along the ground toward the rising column, the Coriolis force makes each parcel turn to the right so that, as seen from above, the incoming flow is rotating counterclockwise in the Northern Hemisphere....
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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 Engineers18 - rapidly...

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