Combining FY-3D MWTS-2 with AMSU-A Data for Inter-Decadal Diurnal Correction and Climate Trends of Atmospheric Temperature

Microwave temperature sounding observations from polar-orbiting meteorological satellites have been widely used for research on climate trends of atmospheric at different heights around the world. Taking Amazon rainforest as target area, this study combined Temperature Sounder-2 (MWTS-2) data onboard Chinese FengYun-3D (FY-3D) satellite with Advanced Sounding unit-A (AMSU-A) National Oceanic and Atmospheric Administration (NOAA) European Meteorological Operational (MetOp) (i.e., NOAA-15, −18, −19, MetOp-A, -B). The double difference method was to estimate thus eliminate inter-sensor bias, a decadal diurnal correction reduce impact local equator crossing times trends. “no-rain” conditions were determined AMSU-A by channels 1 15, MWTS-2 7. Finally, linear 1998 2020 obtained after applying bias calibration inter-decadal −19; -B; FY-3D. A warming trend found in window tropospheric (1–9 15) cooling stratospheric (10–14). (cooling) 7–9 (10) relatively small. 1–6 (14–15) significantly reduced correction.