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• W4381664132 abstract "Radiance data from satellite microwave radiometers are becoming increasingly important in the assimilation of numerical prediction systems. FengYun-3E (FY-3E), which was launched in July 2021, as the first early morning orbital satellite among FY-3 polar-orbiting meteorological satellite series, can greatly enhance the atmospheric sounding capacity in three orbits compared with the two-orbit system that is distributed in morning or afternoon orbit. Focusing on MicroWave Humidity Sounder-2 (MWHS-II) onboard it, the schemes for thinning, quality control, bias correction and observational error calculation are developed. The scan-position-dependent biases are assessed in each channel and increasing biases near the edges of scanline are found in several temperature-sounding channels. The data quality is compared with four analogous instruments used in Global/Regional Assimilation and Prediction System–Global Forecast System (CMA_GFS), and the performance improvements are confirmed relative to the previous FY-3C/D MWHS-II. Three batch experiments were implemented in CMA_GFS with four-dimensional variational (4D-Var) system—assimilating only the humidity-sounding channels, the temperature-sounding channels and the combined channels—to reveal the impact of assimilation by different channel groupings. Analysis results conclude that FY-3E MWHS-II radiances are beneficial to the humidity and temperature analysis fields. These results emphasize the advantage of simultaneously assimilating the humidity/temperature-sounding channels, in which the former dominates the improvement above 700 hPa while the latter have a positive impact below 700 hPa. The forecast results also show that assimilating both the 183- and 118-GHz channels further improves the forecast skills, especially short- to medium-term forecasts in both hemispheres. FY-3E MWHS-II also improves the short-term prediction of heavy rain, which is always weakly predicted in global forecast systems. This study shows that a three polar orbits system that FY-3E began can produce marked effects in the numerical prediction system. This study also shines light on the application potential of the distinctive 118-GHz channels of MWHS-II." @default.
• W4381664132 created "2023-06-23" @default.
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• W4381664132 date "2023-05-01" @default.
• W4381664132 modified "2023-09-25" @default.
• W4381664132 title "Assimilation of data from the <scp>MWHS‐II</scp> onboard the first early morning satellite <scp>FY‐3E</scp> into the <scp>CMA</scp> global <scp>4D‐Var</scp> system" @default.
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• W4381664132 doi "https://doi.org/10.1002/met.2133" @default.
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