wallpaper desert

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deserts are often defined as areas that receive less than 10 inches of average annual rainfall, but a more accurate defining factor is aridity. in addition to low rainfall, deserts are characterized by a high rate of water loss from the ground (evaporation) and through plants (transpiration). together this is called evapotranspiration. potential evapotranspiration is the amount of water that would be lost through evaporation and transpiration if it were available. scientists measure this using a large pan of water under controlled conditions. in deserts the rate of potntial evapotranspiration exceeds the average annual rainfall by factors ranging from 2:1 to 33:1 or more. in other words, a desert is arid. another characteristic of a desert environment is the uneven and unpredictable nature of the little precipitation that occurs. the average annual precipitation is a poor predictor of rainfall in any given year. in some years a desert may receive what seems like abundant rainfall, while in most years rainfall is meager. and some years it may not rain at all. dryness influences other characteristics of deserts. water vapor, either as humidity or cloud cover reflects heat, with a cooling effect. areas with low humidity, few clouds and bodies of water, and little vegetation absorb most of the sun's radiation, thus heating the air at the soil surface.

at night the same conditions allow the heat to be radiated back into the atmosphere. thus, temperatures can be extreme both daily and seasonally. wide temperature fluctuations have another effect. warm air rises, and cool air sinks; rapid temperature change causes desert air to move rapidly from place to place. deserts are windy, and windy conditions contribute to evaporation.