利用全国陆态网络站点反演天顶对流层延迟分布特征

The distribution of zenith troposphere delay inverted in the stations of “Crustal Movement Observation Network in China”

针对对流层延迟研究范围小、时间跨度短的问题,文中利用GAMIT软件获得2015年全国270个态网络站点的对流层延迟值,通过GAMIT中的sh_metutil命令调用Metutil程序,计算并提取天顶对流层总延迟量、干延迟分量、湿延迟分量、温度及气压值。对干、湿延迟的年平均量进行分析,获得全国对流层延迟分布特征;对影响干延迟量的因素进行分析,得到其主要影响因素是气压和高程因素;最后分析湿延迟与降水量的关系,得到两者的分布特征基本一致。

Aiming at the problem that the existing tropospheric delay studies have a small range and a short time span,the tropospheric delay value of 270 land-based network sites in China is researched by GAMIT software in this paper.First,the metutil program is called by the sh_metutil command in GAMIT to calculate and extract the zenith total delay,tropospheric delay,dry wet delay component and temperature component and pressure.Then,its annual mean amount of dry and wet delay is analyzed,and the characteristics of tropospheric delay distribution are obtained.Furthermore,the factors affecting the dry delay are analyzed,and the results show that the main influencing factors are barometric pressure and altitude factor.Finally,the relation between the wet delay and precipitation is analyzed,and the conclusion is that the distribution characteristics of them are basically the same.