Estimating the Soil Surface Specific Humidity

Tsengdar J. Lee Department of Atmospheric Sciences, Colorado State University. Fort Collins, Colorado

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Roger A. Pielke Department of Atmospheric Sciences, Colorado State University. Fort Collins, Colorado

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Abstract

Based on the recent experiment results, a formula is proposed to be used in numerical weather-climate models to estimate the soil surface humidity. The formula has a very simple form and shows a smooth transition in the soil surface specific humidity between wet and dry soil states. The formula is recommended as a replacement to the Philip formula.

Abstract

Based on the recent experiment results, a formula is proposed to be used in numerical weather-climate models to estimate the soil surface humidity. The formula has a very simple form and shows a smooth transition in the soil surface specific humidity between wet and dry soil states. The formula is recommended as a replacement to the Philip formula.

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