Brightness Temperature and Wet Tropospheric Correction of HY-2C Calibration Microwave Radiometer Using Model-Derived Wet Troposphere Path Delay from ECMWF

The Calibration Microwave Radiometer (CMR) is a three-band radiometer deployed on the HY-2C satellite in near-Earth orbit, and since it launched, there are few studies presented performance of CMR to date. Therefore, this paper focuses providing an assessment brightness temperature wet troposphere correction (WTC). works at 18.7 GHz, 23.8 GHz 37 nadir-viewing direction, aligned with radar altimeter. path delay altimeter signal caused by water vapour cloud liquid content can be monitored corrected CMR. In paper, guided concept antenna pattern algorithm purely statistical method, we directly establish function between model-derived WTC calculated European Centre from Medium-Range Weather Forecasting (ECMWF) Reanalysis data, which obtain simultaneously. Firstly, principle introduced, then evaluated using reference temperatures Advanced 2 (AMR-2) Jason-3 crossover points. Furthermore, validated three ways: (1) comparing colocated measured AMR-2, (2) ECMWF, allows rapid check global scale, (3) standard deviation Sea Surface Height (SSH) difference points different retrieval methods. linear fit all non-precipitation conditions demonstrated good agreement Jason-3. addition, has obvious decrease SSH compared WTC, indicating significantly improve accuracy measurements. All assessments indicate that performances satisfying expectations fulfilling mission requirements.