关键词: 陆地水储量变化;模型阶方差;C20项精度;相关系数;GRACE-FO模型;

Abstract: In order to effectively compare the accuracy of three GRACE-FO RL06 time-variable gravity field models provided by Center of Space Research (CSR), Helmholtz-Centre Potsdam-German Research Centre for Geosciences (GFZ) and Jet Propulsion Laboratory (JPL), we assessed these three models from the perspectives of model degree variance, C20 accuracy and inversion of global and local terrestrial water storage change. The results showed that the degree variance of JPL RL06 model was greater than those of other two institutions. In term of C20 accuracy, data released by CSR and JPL were closer to Satellite Laser Ranging (SLR). By comparing the results of terrestrial water storage changes inverted by three models and the results of Global Land Data Assimilation system (GLDAS) model, it was found that the results of the three models and GLDAS model were relatively in good agreement. From the local inversion results, the CSR and GLDAS models were in high agreement among the three models.

Key words: terrestrial water storage change; model degree variance; C20 accuracy; correlation coefficient; GRACE-FO model