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
崔许睿 1王苗苗 2卞桂阳 1周德福 1费叔春 1戴宇航 1蔡文轩1
作者信息
- 1. 常州工学院 计算机信息工程学院,江苏 常州 213032
- 2. 常州工学院 计算机信息工程学院,江苏 常州 213032;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
- 折叠
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.
Abstract
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 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Key words
global navigation satellite system (GNSS) meteorology/precipitable water vapor (PWV)/water vapor tomography/rainfall monitoring引用本文复制引用
基金项目
国家自然科学基金项目(42304010)
常州工学院人才项目(E3-6207-21-060)
常州工学院人才项目(31020222007)
出版年
2024
NETL
NSTL
万方数据