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研究了反演区域陆地水储量变化的点质量模型方法,采用Tikhonov正则化方法解决了反演过程中参数估计病态问题。利用GRACE(gravity recovery and climate experiment)时变重力场模型数据,用点质量模型方法反演了中国大陆及其周边地区陆地水储量变化,将点质量模型反演结果与球谐系数法反演结果、GLDAS(global land data assimilation)水文模型数据进行了验证分析,并选取了4个特征点计算了陆地水储量变化时间序列。实验结果表明,由于点质量模型方法将研究区域内不同网格质量变化对地球重力场的影响分离开来,所得区域陆地水储量变化局部信号更明显,并且点质量模型方法反演结果与GLDAS水文模型数据相关性更强。
The point quality model method of inversion of terrestrial water reserves in the study area was studied. Tikhonov regularization method was used to solve the ill-posed problem of parameter estimation in the inversion process. Using GRACE (gravity recovery and climate experiment) time-varying gravitational field model data, the change of terrestrial water reserves in the Chinese mainland and its surrounding areas was inversed by the point-mass model method. The inversion results of the point-mass model and the spherical harmonic coefficient inversion , GLDAS (global land data assimilation) hydrological model data were verified and analyzed, and four feature points were selected to calculate the change of terrestrial water storage time series. The experimental results show that the local signal of terrestrial water reserves change is more obvious due to the point quality model method separating the influence of different grid quality changes in the study area on the Earth’s gravitational field and the inversion results of the point quality model method are consistent with the GLDAS hydrology Model data more relevant.