区域地壳结构差异对GRACE-FO反演中国近10个月陆地水负荷垂直形变的影响

利用CSR、JPL、GFZ三家机构最新发布的新一代重力卫星GRACE-FO（GRACE-Follow On）时变重力场模型揭示2018-06~2019-05我国陆地水储量随时间演变的时空特征，研究利用Hard与PREM模型分析区域地球结构差异对GRACE-FO重力数据反演我国近10个月陆地水负荷垂直形变的影响。结果表明，60阶径向负荷勒夫数的相对差异为-4.267%，前60阶垂直负荷形变最大差异位于云南一带的澜沧江流域地区，幅值约为0.7 mm/a。因此在使用GRACE-FO重力卫星数据估算中国大陆地表垂直负荷形变时，区域地球结构的影响不容忽视。

Influence of Regional Crustal Structure Differences on GRACE-FO Inversion of Vertical Deformation of Terrestrial Water Load in China in the Last 10 Months

To reveal the spatio-temporal characteristics of terrestrial water storage evolution in China during 2018-06 to 2019-05, we propose the latest GRACE-FO(GRACE-Follow On) time-variable gravity field model released by CSR, JPL, and GFZ. At the same time, we analyze the effect of regional crustal structure differences on GRACE-FO gravity data to retrieve the vertical deformation of terrestrial water load by Hard and PREM models. The results show that the relative difference of radial load Love number with 60th order is -4.267%, and the largest difference of vertical load deformation with the first 60th order is located in the Lancang river area in Yunnan, with an amplitude of about 0.7 mm/a. Therefore, when using GRACE-FO gravity satellite data to estimate the vertical load deformation in China, the influence of regional crustal structure cannot be ignored.