Abstract：We use the GRACE time-variable gravity field models released by the University of Texas Space Research Center (CSR) to determine the optimal Gaussian filter radius of the model based on the maximum SNR (signal-to-noise ratio) criterion. Therefore, we use the RL06 SH (spherical harmonics) model to study the TWSC (terrestrial water storage changes) of the Congo river basin from 2002-04 to 2020-05, analyze its spatio-temporal distribution characteristics, and explore the driving factors in combination with hydrological, precipitation and evapotranspiration data. Results show that the TWSC annual signals in the Congo river basin derived from the GRACE model are consistent with those from the land surface water estimated by the hydrological model, which indicates that the driving factor for the annual change of TWS in the Congo River Basin is surface water changes. Withrespect to inter-annual changes, the TWSC during 2002-04-2020-05 slightly increases, but decreases significantly from 2002-04 to 2006-12. The estimated results of RL06 SH models is -2.30±0.24 cm/a; there is an increasing trend from 2007-01 to 2010-12, which was 0.38±0.24 cm/a; The TWS has increased even more rapidly during the period of 2011-01-2020-05, with the trend of 0.92±0.12 cm/a.
WANG Wei,SHEN Yunzhong,WANG Fengwei. Analysis on the Terrestrial Water Storage Changes in the Congo River Basin from 2002 to 2020[J]. jgg, 2021, 41(5): 466-470.
