The Effect of Surface Soil Moisture on Heat Balance at a Bare Soil Surface

Surface soil moisture content, surface heat fluxes and meteorological data were measured simultaneously on a bare field to investigate the effect of surface soil moisture on the heat balance at a bare soil surface. A simple heat balance model for a bare soil surface was constructed, including empirical expressions of parameters (albedo, atmospheric emissivity, ratio G to Rn, aerodynamic resistance and soil resistance) which were determined from the measured data at 9 a.m., as it is difficult to evaluate the effect directly from the measured data. By calculation using this model, the relationship between the volumetric soil moisture content within the top 2cm layer and the surface heat balance under a given meteorological condition was clarified.