Abstract
A technique for determining surface soil heat flux, based upon measurements of the mean temperature, T , and upon knowledge of the mean moisture content of the soil, is described. A thermocouple probe was developed to measure the mean soil temperature, T , of the upper 50 cm of a soil. The thermocouple probe has 22 copper—constantan thermocouples, placed along its length in such a manner that once inserted vertically into soil it provides an estimate of the average soil temperature down to 50 cm. Measurements of soil heat flux obtained with the probe compared favorably with determinations of the soil heat flux using the temperature integral method. Values of the soil heat flux obtained with the thermocouple probe also agreed with values of soil heat flux obtained with a resistance probe. The probe methods were found to be more reliable for soil heat flux determinations than the soil heat flux plate method, and required fewer measurements and calculations for determination of soil heat flux than with the temperature integral method.
Published Version
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