BDS对天津不同强度降雨的响应研究  

Response of BDS to rainfall events of different intensities in Tianjin

作　　者：时赛男 王潜心[1] SHI Sainan;WANG Qianxin(School of Environment and Spatial Informatics,China University of Mining and Technology,Xuzhou,Jiangsu 221116,China)

机构地区：[1]中国矿业大学环境与测绘学院,江苏徐州221116

出　　处：《导航定位学报》2024年第5期106-114,共9页Journal of Navigation and Positioning

基　　金：国家重点研发计划项目(2020YFA0713502)。

摘　　要：为了进一步提升全球卫星导航系统(GNSS)探测大气水汽信息进行短临极端天气预警预报的精度,进行北斗卫星导航系统(BDS)对天津不同强度降雨的响应研究:选取天津市多个连续运行参考站(CORS),基于天津市2023年8月1日至23日发生的多次降雨,使用北斗卫星导航系统(BDS)数据反演大气可降水量(PWV);并研究其对不同强度降雨的响应机制。结果表明,以第五代大气再分析数据集(ERA5)探测的PWV作为参考值,BDS PWV的标准差(STD)和均方根(RMS)误差均小于2.86 mm,其精度与全球定位系统(GPS)反演的PWV相当;不同强度降雨发生前,PWV均快速陡增且其增量与降雨强度呈正相关;利用PWV的持续增加时间阈值10 h与其增量阈值20 mm,可对天津市不同强度降雨实现有效预测,对强降水尤其极端强降水事件的预警具有重要意义。In order to further improve the detection accuracy of atmospheric water vapor information for short-term extreme weather warning and forecast by global navigation satellite systems(GNSS),the paper studied the response of BeiDou navigation satellite system(BDS)to rainfall events of different intensities in Tianjin:several continuous operating reference stations(CORS)in Tianjin were selected,based on the multiple rainfall events in Tianjin from August 1 to 23,2023,BDS data were used to invert atmospheric precipitable water vapor(PWV),and its response mechanism to different intensity of rainfall was discussed.Results showed that,using PWV detected by the fifth generation atmospheric reanalysis dataset(ERA5)as reference values,the standard deviation(STD)and root mean square(RMS)of BDS PWV would be both less than 2.86 mm,which could be equivalent to the accuracy of PWV inverted by global positioning system(GPS);moreover,before rainfall of different intensity,PWV would increase rapidly and sharply,and its increment would be positively correlated with rainfall intensity;furthermore,the PWV duration increase threshold of 10 h and its increment threshold of 20 mm could be used to effectively forecast rainfall of different intensification in Tianjin,which would be of great significance for the early warning of heavy precipitation,especially extreme heavy precipitation events.

关 键 词：北斗卫星导航系统(BDS) 天津连续运行参考站(CORS) 天顶总延迟(ZTD) 大气可降水量(PWV) 降雨量 

分 类 号：P228.4[天文地球—大地测量学与测量工程]