REPORT OF ASSIMILATING MWRI/FY-3D IN ALL SKY OBSERVATIONS OVER SEA WITHIN ARPEGE

K. Chen^1,2, H. Dumas³, P. Chambon³, M. Borderies³

¹School of Atmospheric Sciences, Chengdu University of Information Technology, ² Climate Change and Resources Utilization over Complex Topographic Regions Key Laboratory of Sichuan Province, ³The Centre Nattonal de Recherches Météorologiques, Météo France

MWRI is onboard the afternoon polar satellite Fengyun-3D and worth being evaluated its operational use potential, especially in all-sky stream. Its data quality is assessed on top of the operational version of the global model ARPEGE of Météo France. Only the observations from the 18.7 v/h, 23.8v/h, 36.5v and 89v GHz channels over sea are assimilated in all-sky stream in this study. The results illustrate that humidity sounders, humidity channels of the satellite instruments and imagers benefit the most by the assimilation with MWRI/FY-3D with the updated configurations, but there are seasonal changes of forecasts existing between summer and winter, which do not show for assimilating impacts. Removing the observations of channel 7 can achieve even better assimilating and forecasting impacts and reduce the seasonal differences of forecasts between summer and winter. However, removing observations of the whole channel also removes important information and good observations from the assimilating system, which could lead to negative impacts for forecasts. This study is an important reference for operational use and the evaluation for the second generation of MWRI onboard since Fengyun-3F.