Assimilation of Ocean Surface Wind Data by the HY-2B Satellite in GRAPES: Impacts on Analyses and Forecasts  

作　　者：Jincheng WANG Xingwei JIANG Xueshun SHEN Youguang ZHANG Xiaomin WAN Wei HAN Dan WANG 

机构地区：[1]CMA Earth System Modeling and Prediction Center,China Meteorological Administration,Beijing 100081,China [2]National Meteorology Center,China Meteorological Administration,Beijing 100081,China [3]Southern Marine Science and Engineering Guangdong Laboratory(Guangzhou),Guangzhou 511458,China [4]National Satellite Ocean Application Service,Beijing 100081,China

出　　处：《Advances in Atmospheric Sciences》2023年第1期44-61,共18页大气科学进展（英文版）

基　　金：supported by the Key Special Project for the Introduced Talents Team of Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou) (Grant No. GML2019ZD0302);the National Key R&D Program of China (Grant No. 2018YFC1506205)

摘　　要：The ocean surface wind(OSW)data retrieved from microwave scatterometers have high spatial accuracy and represent the only wind data assimilated by global numerical models on the ocean surface,thus playing an important role in improving the forecast skills of global medium-range weather prediction models.To improve the forecast skills of the Global/Regional Assimilation and Prediction System Global Forecast System(GRAPES_GFS),the HY-2B OSW data is assimilated into the GRAPES_GFS four-dimensional variational assimilation(4DVAR)system.Then,the impacts of the HY-2B OSW data assimilation on the analyses and forecasts of GRAPES_GFS are analyzed based on one-month assimilation cycle experiments.The results show that after assimilating the HY-2B OSW data,the analysis errors of the wind fields in the lower-middle troposphere(1000-600 hPa)of the tropics and the southern hemisphere(SH)are significantly reduced by an average rate of about 5%.The impacts of the HY-2B OSW data assimilation on the analysis fields of wind,geopotential height,and temperature are not solely limited to the boundary layer but also extend throughout the entire troposphere after about two days of cycling assimilation.Furthermore,assimilating the HY-2B OSW data can significantly improve the forecast skill of wind,geopotential height,and temperature in the troposphere of the tropics and SH.

关 键 词：HY-2B ocean surface wind 4DVAR GRAPES-GFS medium-range weather forecast 

分 类 号：P456.7[天文地球—大气科学及气象学]