采用点质量模型方法反演中国大陆及周边地区陆地水储量变化

发布时间：2018-02-12 02:52

本文关键词： 点质量模型 GRACE时变重力场质量变化正则化卫星重力　出处：《武汉大学学报(信息科学版)》2017年07期 　论文类型：期刊论文

【摘要】：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。
[Abstract]:The point mass model method for inversion of regional land water reserves is studied. The ill-conditioned problem of parameter estimation in inversion process is solved by using Tikhonov regularization method. The time-varying gravity field model data of GRACE(gravity recovery and climate experiment are used to solve the problem. The point mass model method is used to invert the changes of land water reserves in and around the mainland of China. The result of point mass model inversion and the result of global land data assimilation by spherical harmonic coefficient method are verified and analyzed. Four characteristic points are selected to calculate the time series of terrestrial water reserves. The experimental results show that the influence of different grid mass changes on the earth gravity field is separated by the point mass model method. The local signals of regional land water reserves change are more obvious, and the inversion results of point mass model method are more correlated with the GLDAS hydrological model data.
【作者单位】：西安测绘研究所;地理信息工程国家重点实验室;西安测绘信息技术总站;
【基金】：国家973计划(2013CB733303) 国家自然科学基金(41374083) 大地测量与地球动力学国家重点实验室开放研究基金(SKLGED2013-3-3-E)~~
【分类号】：P223;P332

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