我国GPS基准站地壳垂直形变的大气负荷效应

Vertical Crustal Displacements Due to Atmospheric Loading Effects at GPS Fiducial Stations in China

利用球谐展开方法对中国地壳运动监测网络工程6个GPS基准站的大气负荷效应作了计算，结果表明，大气负荷引起的地壳垂直形变最大可达20-30mm，且主要表现为季节性变化。通过对6个基准站的大气负荷效应和GPS观测到的垂直形变时间序列的分析对比，得出大气是地壳垂直形变季节变化的主要因素。

Vertical crustal displacements of the Earth＇s crust in China, due to atmospheric loading effects, are assessed by a spherical harmonic expansion method. The results show that the vertical crustal displacements range up to 20-30 ram, predominantly at the seasonal time scale. The comparison between the seasonal time series of atmospheric loading and the observed GPS daily heights for the six GPS fiducial stations in China indicates that atmos phere is the main cause for the seasonal vertical displacements of the Earth＇s crust.