热带气象学报2025，Vol.41Issue(1)：16-25,10.DOI:10.16032/j.issn.1004-4965.2025.001
北斗导航探空上升-下降段探空资料在华南区域数值模式同化应用试验
Application Experiment of Assimilating Beidou Satellite Navigation Round-Trip Sounding Data Observed in Guangdong Province Using CMA-GD Model
摘要
Abstract
To reveal the quality of Beidou satellite navigation round-trip sounding data for the South China region and its impact on the CMA-GD model,the present study compared a one-month dataset of Beidou satellite navigation sounding observations with L-band sounding data and reanalysis data from the European Centre for Medium-Range Weather Forecasts(ECMWF).The results show that the root mean squared errors(RMSE)between Beidou satellite navigation data and L-band sounding data were less than 1 m·s-1 for wind speed,less than 1℃ for temperature,and less than 10％for relative humidity.The standard deviation of observed wind speed from Beidou sounding data was less than 2 m·s-1 in the troposphere,and the observed temperature was～1 K lower than corresponding ECMWF reanalysis data.The observed humidity in the atmosphere was 5％dryer near 200 hPa,while,in other layers,it was 5％～15％wetter than corresponding ECMWF reanalysis data.The standard deviations of each variable(wind,temperature,and humidity)above the troposphere were greater than those of the troposphere.Case studies of a cold air intrusion event and a typhoon landfall process reveal that the assimilation of Beidou navigation sounding data yielded comparable results to the assimilation of L-band data in terms of precipitation prediction scores(TS).Notably,the 24-hour typhoon track forecast improved by 32％when using Beidou navigation data,demonstrating that the assimilation of round-trip sounding data has a neutral to positive impact on short-term precipitation and typhoon track forecasts compared to the assimilation of L-band ascent-only data.关键词
北斗导航探空/同化试验/个例研究/华南区域Key words
Beidou satellite navigation sounding/data assimilation experiment/case study/South China region分类
天文与地球科学引用本文复制引用
张诚忠,黄燕燕,梁家豪,徐黄飞..北斗导航探空上升-下降段探空资料在华南区域数值模式同化应用试验[J].热带气象学报,2025,41(1):16-25,10.基金项目
广东省基础与应用基础研究基金项目(2022A1515011870) （2022A1515011870）
广东省气象局科学技术研究项目(GRMC2022Z04、GRMC2022M01)共同资助 （GRMC2022Z04、GRMC2022M01）
