An Analysis on the Construction of Large-scale Dynamic Changing Model of Discrete Time Variable Gravity from GRACE

doi:10.11947/j.AGCS.2018.20180167

Abstract

Abstract: For the monthly spherical harmonic coefficients (SHCs) from GRACE, a method using empirical orthogonal function (EOF) and multi-channel singular spectrum analysis (MSSA) is presented to effectively reduce its dimension and remove its strip noise. The dynamic changing of the SHCs is analyzed, and the corresponding changing model is then constructed. The significant annual term and long term trend have been found in the discrete SHCs, which account for 50.6% and 77.4% (after the annual term has been deducted) of the total variance, respectively. The nonlinear model, which constructed from long term trend and annual term, can perfectly reflect the dynamic changing of the SHCs and its inversion results. And the fitting standard deviation of the equivalent water height on grids over global land areas is between 0.3 cm and 14.0 cm, and the average standard deviation is 1.8 cm. This study can provide valuable implications for the research on the parameter changing characteristics of gravity field and geodynamics.

Key words: GRACE, time variable gravity, spherical harmonic coefficients, dynamic changing model

CLC Number:

P223

ZHU Chuandong, LIU Jinzhao, WANG Tongqing, CHEN Zhaohui, ZHANG Pin, ZHANG Shuangxi. An Analysis on the Construction of Large-scale Dynamic Changing Model of Discrete Time Variable Gravity from GRACE[J]. Acta Geodaetica et Cartographica Sinica, 2018, 47(12): 1581-1590.

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