ANGULAR EFFECT IN DUAL-WINDOW AVHRR BRIGHTNESS TEMPERATURES OVER OCEANS

The Advanced Very High Resolution Radiometer AVHRR/2 on NOAA satellite s measures brightness temperatures (BT) at different viewing angles. W e propose a statistical method to assess the amplitude of the angular effect in both the original BT's under cloud-free conditions and the e stimated sea surface temperature (SST). The method is applied to the A nalogue Picture Transmission BT's in AVHRR/2 Channels 3 (3.7 mu m) and 4 (10.8 mu m). We analyse two independent data sets collected over th e same target in tropical Atlantic in June 1987 and December 1988 from NOAA-10 and NOAA-11, respectively.