相当位温
相当位温是某一高度的气团下降（或上升）至参照气压值的位置时，经过绝热膨胀（或收缩）以及所含的水汽全部凝结为水滴发布潜热后，所具有的温度。从相当温度而言，相当位温也就是指某一高度的气团绝对移动至参照气压值位置时所具有的相当温度。
Equivalent potential temperature
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Equivalent potential temperature 相当位温
Equivalent potential temperature, commonly referred to as theta-e 
, is a quantity related to the stability of a column of air in the atmosphere.
is the temperature a parcel of air would reach if all the water vapor in the parcel were to condense, releasing its latent heat, and the parcel was brought adiabatically to a standard reference pressure, usually 1000 hPa (1000 mbar) which is roughly equal to atmospheric pressure at sea level. In stable conditions, increases with altitude. If decreases with height, convection can occur. The comparison of the equivalent potential temperature of parcels of air at different pressures thus provides a measure of the instability of the column of air.
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