Radiometric calibration of the visible and near-infrared bands of SEVIRI using rayleigh scattering and Sun-glint over oceans

Radiometric calibration methods based on clear-sky over ocean natural targets have been applied to three visible and near-infrared bands of SEVIRI sensor onboard MSG1 (now Meteosat-8) satellite. Those methods have been initially developed for in-flight calibration of POLDER sensors [1] and they have been successfully applied to other sensors [2]. An absolute calibration method based on rayleigh scattering is first applied to the 0.6 m band (VIS 0.6). That calibration is then exported to the 0.8 (VIS 0.8) and 1.6 m (NIR 1.6) bands using a cross-band calibration method based on sun-glint reflection. According to error budget analysis the accuracy of the method is below 3 % for VIS 0.6 band and below 5 % for cross-calibrated bands. Application to 2005-2006 data shows excellent stability along time. Calibration correction factors for each of the three bands are proposed.