Mountainvalley Winds

In the valley region, particularly in winter, intensive surface inversions develop from air cooled by the radiation-

/Katabatic Flow

Solar Radiation Absorbed by Pollutants Temperature Gradient of Inversion .Increased, by Warming, in Upper Layers.

Tall Stacks Penetrating the Inversion ■

Solar Radiation Absorbed by Pollutants Temperature Gradient of Inversion .Increased, by Warming, in Upper Layers.

Tall Stacks Penetrating the Inversion ■

FIG-. • 5.6.11. Meteorology-pollution • relationships- .during ' a- smog in ■ a valley . location. (Reprinted, with permission, from D.M. Elsom, 1992, Atmospheric pollution, 2d ed., Oxford, U.K.: Blackwell Publishers.)

■ .'Reduced Thermally-Induced '■••.■• TurbU|ence. Due .to Uss. Solar — . ■ Urban-Heat-Island ' Intensity '. . ; .R^ata ,Pepetrating.the F°g; . ■/... >2/c. Induces a Country Breeze v

FIG-. • 5.6.11. Meteorology-pollution • relationships- .during ' a- smog in ■ a valley . location. (Reprinted, with permission, from D.M. Elsom, 1992, Atmospheric pollution, 2d ed., Oxford, U.K.: Blackwell Publishers.)

ally cooled valley wall surfaces. Populated and industrialized bottom valley areas are subject to a critical accumulation of pollutants during this period.

Areas on the windward side of mountain ranges expect added precipitation because of the forced rising, expansion, and cooling of the moving air mass with the resultant release of moisture. The precipitation increases the removal of pollutants.

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