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Calibration Of The AVHRR Visible And Near Ir Channels Using Radiances Measured Over Remote Ocean Areas

An inflight absolute calibration method previously validated with SPO"/HRV data has been adapted and applied to channel 1 of the Advanced Very High Resolution Radiometer (AVHRR). The approach is based on AVHRR observations in channels 1. 2 and 4. A rigorous cloud screening is performed, based on the homogeneity of the data in channel 1 and 2 and on the temperature in channel 4. In a combined approach, the off-nadir view (40'-70') satellite count in channel 2 is used to detect the aerosol optical thickness and loading and the count of channel 1 is used to calibrate this channel, based on the predictable Rayleigh scattering component. Water vapor data is used, and the channels are intercalibrated using the ratio between channels 1 and 2 over the glint region.