Potential evaporation (PE) or potential evapotranspiration (PET) is defined as the amount of evaporation that would occur if a sufficient water source were available. If the actual evapotranspiration is considered the net result of atmospheric demand for moisture from a surface and the ability of the surface to supply moisture, then PET is a measure of the demand side. Surface and air temperatures, insolation, and wind all affect this. A dryland is a place where annual potential evaporation exceeds annual precipitation.
. . . Potential evaporation . . .
Where
is the estimated potential evapotranspiration (mm/month)
is the average daily temperature (degrees Celsius; if this is negative, use
) of the month being calculated
is the number of days in the month being calculated
is the average day length (hours) of the month being calculated
heat index which depends on the 12 monthly mean temperatures
is a.[1]
Somewhat modified forms of this equation appear in later publications (1955 and 1957) by Thornthwaite and Mather. [2]
. . . Potential evaporation . . .
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