As living organisms, we are most acutely aware of three things about the wind. We know that it exerts a force on us and other objects against which it blows, it is effective in transporting heat from us, and it is highly variable in space and time. A fourth property of the wind, less obvious to the casual observer, but essential to terrestrial life as we know it, is its effective mixing of the atmospheric boundary layer of the Earth. This can be illustrated by a simple example. On a summer day about 10 kilograms of water are evaporated into the atmosphere from each square meter of vegetated ground surface. This would increase the vapor density in an air layer 100 meters thick by 100 g/m3 if there were no transport out of this layer or condensation within it.
KeywordsWind Speed Vertical Wind Roughness Element Wind Profile Atmospheric Turbulence
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