Retrieval of groundwater storage anomalies in eastern region of Korla by downscaling GRACE/GRACE-FO data

被引：0

作者：

Liu, Dongxu ^{[1
]}

Hu, Litang ^{[2
,3
]}

Sun, Jianchong ^{[2
,3
]}

Cheng, Qi ^{[1
]}

Ma, Yixuan ^{[1
]}

Liu, Xin ^{[4
]}

机构：

[1] Northwest Institute of Nuclear Technology, Xi̓an

[2] College of Water Sciences, Beijing Normal University, Beijing

[3] Engineering Research Center of Groundwater Pollution Control and Remediation, Ministry of Education, Beijing

[4] PowerChina Huadong Engineering Corporation Limited,, Hangzhou

来源：

Cehui Xuebao/Acta Geodaetica et Cartographica Sinica | 2024年 / 53卷 / 07期

基金：

中国国家自然科学基金;

关键词：

data fusion; dynamic downscaling; GRACE; groundwater model; groundwater storage anomaly;

D O I：

10.11947/j.AGCS.2024.20230354

中图分类号：

学科分类号：

摘要：

Despite the gravity recovery and climate experiment(GRACE) and GRACE follow-on (GRACE-FO)satellites provide a new capability for retrieving and monitoring of global large-scale groundwater storage anomaly (GWSA), its data products struggle to provide access to small-scale GWSA information with high spatial resolution. In this paper, a dynamic downscaling method was employed to improve the spatial resolution of GWSA data retrieved by GRACE/GRACE-FO and to analyse the spatio-temporal distribution of GWSA in the eastern area of Korla, Xinjiang, China. Firstly, a GWSA numerical model of eastern region of Korla was constructed and optimized based on data fusion for purposes of the spatial downscaling conversion. Then, the resolution of GRACE/GRACE-FO-derived GWSA data was downscaled from 1° to 0.25° and 0.05° via the optimized model. The derived GWSA results were further compared with the well-monitored groundwater level (GWL) data. Finally, the GWSA trends in specific study areas were evaluated using 0.05° GWSA data.Specific results include: ①Compared to the 1° GWSA without downscaling transformation, the high-resolution GWSA data after downscaling are spatially smoother and more detailed, whose correlation with the GWL monitoring data is increased, indicating an improvement in inversion accuracy and reliability. ②At small scales, the downscaled GWSA can reflect the groundwater regime, such as seasonal and interannual variations, as well as long-term depletion, in specific water sources. ③The GWSA in the eastern area of Korla states the characteristics of spatial and temporal differences, whose trends from 2005 to 2020 are -1~1mm·a-1, generally following an increasing tendency in the south and a decreasing tendency in the north. Specifically, the GWSA slopes in the southern and northern mountainous zones are greater than those in the relatively flat central region. © 2024 SinoMaps Press. All rights reserved.

引用

页码：1265 / 1277

页数：12

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