Evaluating the weekly changes in terrestrial water storage estimated by two different inversion strategies in the Amazon River Basin  

作　　者：Bo Zhong Xianpao Li Qiong Li Jiangtao Tan Xianyun Dai 

机构地区：[1]School of Geodesy and Geomatics,Hubei Luojia Laboratory,Wuhan University,Wuhan 430079,China [2]Key Laboratory of Geospace Environment and Geodesy,Ministry of Education,Wuhan University,Wuhan 430079,China [3]School of Civil Engineering and Geomatics,Southwest Petroleum University,Chengdu 610500,China

出　　处：《Geodesy and Geodynamics》2023年第6期614-626,共13页大地测量与地球动力学（英文版）

基　　金：funded by the National Natural Science Foundation of China(Nos.41974015,42374002);the Project Supported by the Special Fund of Hubei Luojia Laboratory(No.220100004)。

摘　　要：In this study,we estimated the weekly Gravity Recovery and Climate Experiment(GRACE)spherical harmonic(SH)solutions and regional mascon solutions using GRACE-based Geopotential Difference(GPD)data and investigated their abilities in retrieving terrestrial water storage(TWS)changes over the Amazon River Basin(ARB)from January 2003 to February 2013.The performance of the weekly GPD-SH and GPDmascon solutions was evaluated by comparing them with the weekly GFZ-SH solutions,Global Land Data Assimilation Systems(GLDAS)-NOAH hydrological model outputs,and monthly GFZ-SH,GPD-SH,and CSRmascon solutions in the spatio-temporal and spectral domains.The results demonstrate that the weekly GPD-SH and GPD-mascon present good consistency with the weekly GFZ-SH solutions and GLDAS-NOAH estimates in the spatio-temporal domains,but GPD-mascon presents stronger signal amplitudes and more spatial details.The comparison of the monthly average of weekly estimates and monthly solutions demonstrates that the weekly GPD-mascon and GFZ-SH with DDK1 filtering are close to the monthly CSRmascon and GFZ-SH solutions,respectively.However,the signal amplitudes of TWS changes from GPD-SH and GFZ-SH with 650 km Gaussian filtering are smaller than the monthly solutions,and the corresponding Root Mean Square Errors between the TWS change time series from the monthly average of weekly solutions and monthly estimates are 18.12 mm(GPD-mascon),18.81 mm(GFZ-SH-DDK1),24.93 mm(GPDSH-G650km),and 33.07 mm(GFZ-SH-G650km),respectively.Additionally,the TWS change time series derived from weekly solutions present more high-frequency time-varying information than monthly solutions.Furthermore,the 300 km Gaussian filtering can improve the signal amplitudes of TWS changes from the weekly GPD-SH solutions more than those with 650 km Gaussian filtering,but the corresponding noise level is higher.The weekly GPD-SH and GPD-mascon solutions can extend the application scopes of GRACE and provide good complements to the current GRACE monthly solutions.

关 键 词：Terrestrial water storage change Amazon River Basin GRACE-based geopotential differences Weekly solutions Performance evaluation 

分 类 号：P223[天文地球—大地测量学与测量工程] P332[天文地球—测绘科学与技术]