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Diurnal radiative forcing of biomass burning aerosols over Africa from merged GERB and SEVIRI data

The synergy between the Geostationary Earth Radiation Budget (GERB) broadband radiometer and the Spinning Enhanced Visible and Infra Red Imager (SEVIRI) on board the European meteorological satellite Meteosat-8 is exploited to estimate the diurnal variation of the direct short wave aerosols radiative forcing (DSWARF) from biomass burning over Africa at sub-GERB footprint scale. Biomass burning are first identified at the SEVIRI resolution (3 km at nadir) by applying a multispectral thresholding algorithm to the SEVIRI spectral measurements. Reflected SW fluxes at the top-of-atmosphere for smoke aerosols are obtained by converting the measured GERB radiances at the 3×3 SEVIRI pixel window in term of flux using a theoretically derived smoke angular distribution model (ADM) based on the average scene identification (SI) from the 3×3 SEVIRI pixel box. The calculated smoke ADM is a function of aerosol optical depth, surface type and solar and viewing geometry. The TOA DSWARF for smoke aerosols is then estimated as the difference between radiative fluxes in the absence and presence of biomass burning aerosols.