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Moisture advection
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Moisture advection : ウィキペディア英語版
Moisture advection
Moisture advection is the horizontal transport of water vapor by the wind. Measurement and knowledge of atmospheric water vapor, or "moisture", is crucial in the prediction of all weather elements, especially clouds, fog, temperature, humidity thermal comfort indices and precipitation.
==Definition==
Using the classical definition of advection, moisture advection is defined as:
:Adv(\rho_m)=-\mathbf\cdot\nabla \rho_m \!
in which V is the horizontal wind vector, and \rho_m is the density of water vapor. However, water vapor content is usually measured in terms of mixing ratio (mass fraction) in reanalyses or dew point (temperature to partial vapor pressure saturation, i.e. relative humidity to 100%) in operational forecasting. The advection of dew point itself can be thought as moisture advection:
:Adv(T_d)=-\mathbf\cdot\nabla T_d \!

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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