Meteorology for Air Pollution Control Engineers20

Meteorology for Air Pollution Control Engineers20 - 3 n...

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1 n Tornadoes occur most often in spring and summer in the  southeastern and midwestern United States. n Tornadoes do not begin at the ground, as does a dust  devil, but rather begin at the hot-cold air interface and  grow downward toward the ground from there.
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2 3.4 Mixing Height n In Fig. 5.7, for the midafternoon condition, there will be  vigorous vertical mixing from the ground to about 6,000  ft and then negligible vertical mixing above that height. n The rising air columns that provide good vertical mixing  induce large-scale turbulence in the atmosphere.
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Unformatted text preview: 3 n This turbulence is three-dimensional, so it also provides good horizonal mixing. n Pollutants released at ground level will be mixed almost uniformly up to the mixing height, but not above it. n Thus the mixing height sets the upper limit to dispersion of atmospheric pollutants. 4 n In Fig. 5.7, we can see that in the morning the mixing height must be much lower and that it grows during the day. n Similarly, we expect that the mixing height would be larger in the summer than the winter (Table 5.1, next slide)....
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Meteorology for Air Pollution Control Engineers20 - 3 n...

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