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Comparison of Surface IR Radiometer and Near Surface Air Temperatures over a Grass Covered Field

where p is the air density, Cp the specific heat of air at constant pressure, T d is the radiometric temperature of the surface as measured in the thermal infrared portion of the electromagnetic spectrum, T k is the air temperature measured at some height (2) above the ground (e.g. 2-m), Rn is the net radiative heat flux density, G is the soil heat flux density, and w is the resistance to heat transfer between the surface and z. Equation (2) is the surface energy balance rewritten so that LE is calculated as the residual term after &, H, and G have been calculated. G is often calculated as some constant proportional to Rn. Rn can be estimated from satellite remote sensing data at visible and infrared wavelengths (Sellers et al, 1990). Estimation of Rn, and then G, in this way results in an uncertainty in their values of 20 96 or more.