Definition

The wet-bulb potential temperature (theta-w) is the wet-bulb temperature a sample of air would have if it were brought along a saturation adiabat to a pressure of 1000 hPa.

The wet-bulb potential temperature is identical to the wet-bulb temperature, except that the sample is brought moist adiabatically from the wet-bulb temperature at the initial level to the wet-bulb potential temperature at the 1000-hPa level.

Wet-bulb potential temperature is commonly expressed in Kelvins. However, in this module we will use °C for the sake of convenience. To convert from K to °C, simply subtract 273.15.

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