Angular Dependence Models for Aerosols from Combined MODIS/CERES Measurements

With the launch of the Terra and Aqua satellites, new capabilities now exist for studying the spatial distribution of aerosols, their properties and radiative effects. The Moderate-Resolution Imaging Spectroradiometer (MODIS) are used to detect aerosols and retrieve their radiative properties. The Clouds and Earth's Radiant Energy System (CERES) with improved capabilities can be used to study the radiative impact of aerosols. However, to invert the CERES radiances to TOA fluxes requires angular Dependence Models. In this study the MODIS and CERES data are combined to create a merged cloud-free product. For these cloud free data, the CERES ES-8 rotational azimuth plane and cross scan mode data are used for developing ADM­_s as functions of wind speeds and aerosols over the oceans. The Special Sensor Microwave imager (SSM/I) product is used to examine wind speed effects. Our preliminary results show that for cloud and aerosol free regions, the ADM­_s are different at low and high wind speeds. Dust aerosols also have significantly different ADM­_s than what were used previously assumed. Our results imply that new ADM­_s as functions of wind speed and aerosols are needed to reduce uncertainties in aerosol radiative forcing from satellite measurements