Estimating continental water storage variations in Central Asia area using GRACE data

35th International Symposium on Remote Sensing of Environment

地球科学;生态环境科学

Dapeng, Mu^1,2,3 ; Zhongchang, Sun^1 ; Jinyun, Guo^2

Institute of Remote Sensing and Digital Earth, Chinese Academy of Sciences, Beijing, China^1

College of Geometrics, Shandong University of Science and Technology, Qingdao, China^2

579 Qianwangang Road Eco. and Tech. Dev. Zone, Qingdao, 266510, China^3

关键词: Continental water storage;    Filtering method;    Fluid mass redistributions;    Hydrology modeling;    Least squares adjustments;    Precipitation data;    Tarim River basin;    Water storage variation;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/17/1/012131/pdf
DOI  :  10.1088/1755-1315/17/1/012131

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

The goal of GRACE satellite is to determine time-variations of the Earth's gravity, and particularly the effects of fluid mass redistributions at the surface of the Earth. This paper uses GRACE Level-2 RL05 data provided by CSR to estimate water storage variations of four river basins in Asia area for the period from 2003 to 2011. We apply a two-step filtering method to reduce the errors in GRACE data, which combines Gaussian averaging function and empirical de-correlation method. We use GLDAS hydrology to validate the result from GRACE. Special averaging approach is preformed to reduce the errors in GLDAS. The results of former three basins from GRACE are consistent with GLDAS hydrology model. In the Tarim River basin, there is more discrepancy between GRACE and GLDAS. Precipitation data from weather station proves that the results of GRACE are more plausible. We use spectral analysis to obtain the main periods of GRACE and GLDAS time series and then use least squares adjustment to determine the amplitude and phase. The results show that water storage in Central Asia is decreasing.