青藏高原大尺度地表流体的重力效应特征分析

基于2002~2017年三维大气再分析模型、水文模式及GRACE卫星重力数据，采用负荷格林函数和卫星重力反演方法分析青藏高原大尺度地表流体的重力效应特征。结果表明，青藏高原地区大气扣除季节项前后的重力效应峰对峰变化介于1.9~10.7 μGal和1.1~4.6 μGal，其负荷效应呈现出显著的季节性特征；土壤水和积雪扣除季节项前后的重力效应峰对峰变化介于0.9~9.9 μGal和0.7~8.3 μGal，其负荷效应呈现出显著的季节性和年际变化特征；GRACE时变重力场扣除季节项前后的重力变化峰对峰变化介于4.4~24.1 μGal和3.4~18.3 μGal，考虑观测误差、构造运动和信号泄漏误差的影响，其显著的季节性和年际变化反映了多种地表流体的综合影响。

The Analysis on Characteristics of Gravity Effect of Large-Scale Surface Fluid in Qinghai-Tibetan Plateau

Based on the three-dimensional atmospheric reanalysis model, the hydrological model and GRACE satellite gravity data from 2002 to 2017, we use Green’s function and the satellite gravity inversion method to analyze the gravity effect characteristics of large-scale surface fluid in Qinghai-Tibet plateau. The atmospheric gravity peak-to-peak effect before and after deducting seasonal term is between 1.9-10.7 μGal and 1.1-4.6 μGal, respectively, which shows significant seasonal characteristics. The gravity peak-to-peak effects of soil water and snow before and after deducting seasonal term is between 0.9-9.9 μGal and 0.7-8.3 μGal, respectively, which shows significant seasonal and interannual characteristics. The peak to peak change of GRACE time variable gravity field is between 4.4-24.1 μGal and 3.4-18.3 μGal before and after deducting seasonal term. Considering measurement error, tectonic movement and leakage error, the significant seasonal and interannual change of GRACE gravity reflects the combined effects of various surface fluids.