ch_04_sum_precip

Introducing Physical Geography (Wse)

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Chapter 4 Atmospheric Moisture and Precipitation Overall, this chapter considers the types and sources of moisture in the atmosphere. While examining the mechanism of condensation of atmospheric moisture into precipitation, the process of adiabatic cooling and heating during changes in air mass elevation in the atmosphere is thoroughly examined. Additionally, this chapter explores the effects of human activities on atmospheric air quality. Water exists in the atmosphere as water vapor , clouds , fog, and precipitation . The physical movement of water between the land, the oceans, and the atmosphere is called the hydrologic cycle . Humidity refers to the amount of water vapor in the air. The amount of water the air can hold is dependant upon air temperature . Warm air can hold more moisture than cold air. Specific humidity is the actual mass of water vapor per mass of air, usually stated in grams of water vapor per kilogram of air. It is a measure of the amount of water vapor that can be extracted from the atmosphere as precipitation.
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