Determination of Tropical Radiation Budget at High Time and Space Resolution by Combination of Geostationary and Polar Satellite Measurements

ERB(Earth Radiation Budget) data describe how the earth gains en-gergy, due to absorbed solar radiation ux, or looses energy, due to emitted thermal radiation ux. Since the atmospheric energetics is described by diierential equations with derivatives in space and in time, high resolution spatial and temporal ERB data should be available. ERB data derived from satellite measurements exist (ERBE(Earth Radiation Budget Experiment) 8] , ScaRaB(Scanning radiometer for Radiation Budget measurements) 9], planned: CERES(Cloud and the Earth's Radiant Energy System)) but the space/time resolution of these data is insuucient to use them directly as input to atmospheric models. The purpose of this work is to combine these data with the high space/time resolution images of geostationary meteorological satellites (such as METEOSAT or the future MSG(Meteosat Second Genereation) carrying SEVIRI(Spinning Enhanced Visible and Infrared Imager) and GERB(Geostationary Earth Radiation Budget)), in order to obtain ERB data with much higher spatial 1 and temporal resolution. As a testcase, we derive this data from Novem-ber 1986 METEOSAT images and we compare the results with those of the ERBE instruments on the polar satellites NOAA 9 and NOAA 10. We obtain diierences close to the minimum ones obtainable according to theoretical simulations.