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Gamma—The Psychrometer Non-Constant

D. StorrAtmospheric Environment Service, Calgary, Alberta, Canada

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G. Den HartogAtmospheric Environment Service, Downsview, Ontario, Canada

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Abstract

Using 0.66 mb K−1 for γ, the psychrometric constant, can cause underestimates of evapotranspiration in excess of 5% at elevations above 1000 m. Graphs and equations are presented to prevent this error and to facilitate the calculation of evapotranspiration.

Abstract

Using 0.66 mb K−1 for γ, the psychrometric constant, can cause underestimates of evapotranspiration in excess of 5% at elevations above 1000 m. Graphs and equations are presented to prevent this error and to facilitate the calculation of evapotranspiration.

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