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Assessment of Evaporation from Bare Soil by Infrared Thermometry¹

ABSTRACT

A method is described to estimate daily soil water evaporation from a drying uniform bare soil. The method involves wind speeds (u) and midday infrared thermometric measurements of surface temperatures of the drying soil (T_d) and a nearby reference dry soil (T_o). Calculation of evaporation is made using a linear function of (T_o-T_d) and u derived from basic energy balance considerations. An experiment was conducted in Tucson, Ariz., to compare lysimeter-measured values of evaporation with those estimated on the basis of the method. Three lysimeters (0.5 by 0.5 by 0.12 m) containing uniform soil were used in this experiment. One was kept wet (steady-state saturation), one was air dry, and one was initially wetted and allowed to dry during a 21-d interval in December 1981. Results showed a good agreement (r² = 0.61) between the theoretical and measured values. The method is proposed for use in studies of field variability of soil water evaporation and is amenable to the utilization of remotely sensed data.

¹ Contribution from the Arizona Agric. Exp. Stn., Tucson, AZ 85721, Journal Paper no. 3650.

² Visiting Assistant Professor, Assistant Professor, and Professor, respectively, Dep. of Soils, Water and Engineering, The University of Arizona. The Senior Author was on leave from Ben-Gurion University, Institute for Desert Research, Israel.

Received for publication August 9, 1982. Accepted for publication November 5, 1982.

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