GNSS水汽反演层析及其对降雨监测的分析  

Analysis of GNSS water vapor with retrieval and tomography technology as well as their usage in rainfall process monitoring

作　　者：崔许睿 王苗苗 卞桂阳 周德福 费叔春 戴宇航 蔡文轩 CUI Xurui;WANG Miaomiao;BIAN Guiyang;ZHOU Defu;FEI Shuchun;DAI Yuhang;CAI Wenxuan(School of Computer Science and Information Engineering,Changzhou Institute of Technology,Changzhou,Jiangsu 213032,China;Key Laboratory of Meteorological Disasters,Ministry of Education(KLME)/Joint International Research Laboratory of Climate and Environmental Change(ILCEC)/Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disaster(CIC-FEMD),Nanjing University of Information Science&Technology,Nanjing,Jiangsu 210044,China)

机构地区：[1]常州工学院计算机信息工程学院,江苏常州213032 [2]南京信息工程大学气象灾害教育部重点实验室/气候与环境变化国际合作联合实验室/气象灾害预报预警与评估协同创新中心,南京210044

出　　处：《导航定位学报》2024年第2期129-138,共10页Journal of Navigation and Positioning

基　　金：国家自然科学基金项目(42304010);常州工学院人才项目(E3-6207-21-060,31020222007)。

摘　　要：为了进一步研究全球导航卫星系统(GNSS)反演层析的水汽在降雨监测中的应用,以香港地区卫星定位参考站网(SatRef)中18个站点的GNSS观测数据和气象观测数据为基础,采用非差分方式分析网内各站点上空的天顶对流层湿延迟和测站上空的大气可降水量反演:结合水汽层析技术获得三维分布的大气水汽结构,并分别以大气可降水量和无线电探空站的垂直剖面数据为参考对层析结果进行检核,结果表明,内部平均差异约2 mm,外部差异最大1.7 mm,显示出较好的一致性;以红色警告的一次降雨过程为例,对降雨前后水汽的分布及其变化进行分析。实验结果表明,GNSS反演的区域大气可降水量及空间水汽尤其是低高度层的水汽,在降雨前后变化较为明显,能够更加及时有效地反映降雨前后及降雨过程中水汽的变化和空间移动过程。In order to further study the application of water vapor that uses global navigation satellite system(GNSS)retrieval and tomography technology in rainfall process monitoring,with the help of GNSS observations and the corresponding meteorological data from 18 ground-based stations in Hong Kong region satellite positioning reference station network(SatRef),the paper used zero-difference scheme to generate zenith wet delays above each station in SatRef,and retrieve the precipitable water vapor(PWV)above each station:the tomography technology was implemented to obtain the regional three-dimensional distributed water vapors,and the tomographic water vapors were evaluated and assessed by both GNSS calculated PWV and radiosonde profiles,then it was showed that the inner mean difference would be about 2 mm and the maximal external difference 1.7 mm,indicating good satisfactory consistency;moreover,taking a rainfall process with red warning as an example,the distribution and change of water vapor before and after rainfall were analyzed in time domain.Experimental result showed that the regional atmospheric PWV and spatial water vapor retrieved by GNSS,especially the water vapor in the low altitude layer,would change more obviously before and after rainfall,which could reflect the change and spatial movement of water vapor before and after rainfall and during rainfall in a more timely and effective manner.

关 键 词：全球导航卫星系统(GNSS)气象学 大气可降水量(PWV) 水汽层析 降雨监测 

分 类 号：P228[天文地球—大地测量学与测量工程]