台风对卫星导航对流层延迟的影响  

Influence of Typhoon on Tropospheric Delay of Satellite Navigation

作　　者：李卓盈 陈逸伦 黎伟标 LI Zhuoying;CHEN Yilun;LI Weibiao(School of Atmospheric Sciences,Sun Yat-sen University,2 Daxue Road,Zhuhai 519082,China;Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai),2 Daxue Road,Zhuhai 519082,China)

机构地区：[1]中山大学大气科学学院,广东省519082 [2]南方海洋科学与工程广东省实验室(珠海),广东省519082

出　　处：《大地测量与地球动力学》2023年第4期374-379,共6页Journal of Geodesy and Geodynamics

基　　金：国家自然科学基金(42105068,42075004);南方海洋科学与工程广东省实验室(珠海)创新团队建设项目(311022006)。

摘　　要：为研究台风时期对流层延迟的演变,基于ERA5再分析数据,计算西北太平洋1822号台风“山竹”、1622号台风“海马”以及西北大西洋1709号飓风(台风)“厄玛”时期各高度层可降水量及对应的对流层延迟。结果表明,计算得到的对流层延迟与IGS对流层延迟产品存在明显时空差异,台风对测站影响越强,两者一致性越差。进一步分析表明,台风过境会引起可降水量及各高度层水汽分布比例发生变化,两者均会影响对流层延迟,其中,可降水量的变化占主导。在可降水量一定、850~500 hPa高度层中水汽含量占比最大时,对流层延迟最大。台风使分布于对流层低层的水汽增多,使用传统对流层延迟模型估算对流层延迟,可能会产生额外误差。To study the evolution of tropospheric delay during typhoons,based on ERA5 reanalysis data,this paper calculates atmospheric precipitable water vapor of each altitude layer and tropospheric delay during northwestern Pacific typhoon 1822 Mangkhut,1622 Haima and northwestern Atlantic hurricane(typhoon)1709 Irma.The results show that there are spatial and temporal differences between the tropospheric delay calculated by ERA5 data and IGS tropospheric delay product.The stronger the influence of typhoon on the station,the more consistency is affected.Further analysis shows that typhoon transits change the precipitable water vapor and its proportion in each altitude layer at the same time,both affecting tropospheric delay.The former is dominant.At a certain amount of precipitable water,the tropospheric delay is the largest when the proportion of water vapor between 850-500 hPa is the largest.Typhoons increase the amount of water vapor distributed in the lower troposphere,so the estimation of tropospheric delay using the traditional tropospheric delay model may produce additional errors.

关 键 词：台风 对流层延迟 ERA5再分析资料 可降水量 湿延迟 

分 类 号：P228[天文地球—大地测量学与测量工程]