Estimation of Land Surface Heat Fluxes over the Tibetan Plateau Using GMS Data

A Surface Energy Balance System (SEBS) originally developed for the NOAA Advanced Very High Resolution Radiometer was applied toGeostationary Meteorological Satellite(GMS)-5Visible/Infrared Spin-Scan Radiometer data that were supplemented with other meteorological data.GMS-5, which is a geostationary satellite, recorded continuous hourly information. Surface temperatures obtained from theGMS-5data were entered into SEBS to estimate the hourly regional distribution of the surface heat fluxes over the Tibetan Plateau. The estimated fluxes are verified by using corresponding field observations. The diurnal cycle of estimated fluxes agreed well with the field measurements. For example, the diurnal range of the estimated sensible heat flux decreases from June to August. This reflects the change of dry to wet surface characteristics resulting from frequent precipitation during the summer monsoon. Over the Tibetan Plateau, the diurnal range of the surface temperature is as large as the annual range, so that the resultant sensible heat flux has a large diurnal variation. Thus, the hourly estimation based on the GMS data may contribute to a better understanding of the land surface–atmosphere interaction in this critical area.