Meteorology for Air Pollution Control Engineers40

Meteorology for Air Pollution Control Engineers40 -...

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Vertical Temperature Profiles Ø Environmental lapse rate (ELR) Ø Dry adiabatic lapse rate (DALR) If, Ø ELR > DALR =sub adiabatic condition, atmosphere is stable . Ø ELR >> DALR = Inversion conditions. Very stable atmosphere. Ø ELR= DALR = atmosphere is neutral . Ø ELR< DALR = super adiabatic condition, atmosphere is unstable . Shapes of plumes depends upon atmospheric stability conditions.
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Mixing Height of atmosphere The height of the base of the inversion layer from ground surface .
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General Characteristics of Stack Plumes Dispersion of pollutants Wind – carries pollution downstream from source Atmospheric turbulence -- causes pollutants to fluctuate from mainstream in vertical and crosswind directions Mechanical & atmospheric heating both present at same time but in varying ratios Affect plume dispersion differently
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Plume Types Plume types are important because they help us understand under what conditions there will be higher concentrations of contaminants at ground level.
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Meteorology for Air Pollution Control Engineers40 -...

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