Calibration of Temperature Troposphere / Stratosphere from Advanced Microwave Sounding Unit using High Quality Radiosonde Data Identified by Radio Occultation Data

In this study, we use FORMOSAT-3/Constellation Observing System for Meteorology, Ionosphere, and Climate (COSMIC) Global Positioning System (GPS) radio occultation (RO) data and CHAllenging Minisatellite Payload (CHAMP) data to identify high quality radisodonde types and use temperature profiles from those radiosonde types to calibrate brightness temperatures for the temperature of troposphere stratosphere (TTS) from Advanced Microwave Sounding Unit (AMSU). Five types of Vaisala RS80 and RS90 radiosondes data collected from 2001 to 2010 are used to simulate Channel 7 (TTS) brightness temperatures (Tbs) for AMSU instruments on board NOAA15, 16, 18, 19 and Metop-A. Using radiosonde simulated AMSU Tbs, we calibrate AMSU TTS from different NOAA missions in the same month. A new microwave sensor temperature record in the lower stratosphere and troposphere from 2001 to 2010 is constructed. The derived TTS record is compared with the available TTS datasets generated by other groups. The causes of the TTS differences among these datasets are discussed.