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Conference Paper

Groundwater Storage Changes in the North China Plain Based on the Joint Inversion Downscaling Method and GRACE/GRACE-FO data

Authors

Xiong,  Yuhao
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Feng,  Wei
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Strohmenger,  Christina
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Kusche,  Jürgen
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Wang,  Changqing
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Shen,  Yunzhong
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Chen,  Qiujie
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Zhong,  Min
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

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Citation

Xiong, Y., Feng, W., Strohmenger, C., Kusche, J., Wang, C., Shen, Y., Chen, Q., Zhong, M. (2023): Groundwater Storage Changes in the North China Plain Based on the Joint Inversion Downscaling Method and GRACE/GRACE-FO data, XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) (Berlin 2023).
https://doi.org/10.57757/IUGG23-3942


Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5019891
Abstract
The GRACE and GRACE-FO gravity satellites have become an important tool for monitoring large-scale groundwater storage (GWS) changes. However, the limited spatial resolution of the monthly gravity field models obtained from GRACE/GRACE-FO and the need for separating GWS from other relevant storage changes leads to large uncertainties in monitoring GWS signals at small scales. To improve the spatial resolution and address the signal leakage, we propose a joint inversion downscaling method based on the independent component analysis method to separate the GWS changes in the North China Plain (NCP). This method combines the high spatial resolution information (0.5°) of different compartment storages simulated within WGHM and the large-scale spatio-temporal mass changes information from GRACE/GRACE-FO within a least square adjustment, and derives downscaled and isolated GWS signals. Significant interannual GWS changes are found in the results of GRACE/GRACE-FO with a long-term trend of -4.03±0.14 km3/year from 2005 to 2022, which are confirmed by in-situ groundwater level observations. Our analysis reveals that the GWS in the NCP experienced four stages: depletion from 2005 to 2009, stability from 2010 to 2013, depletion again from 2014 to 2019, and then rapid recovery from 2020 to 2022. The recent GWS recovery occurs in both shallow and deep aquifers, due to more precipitation since 2020 in the NCP. Our results demonstrate that the method can effectively improve the spatial resolution of GRACE/GRACE-FO (increased to 50 km), enhance the ability to monitor the small-scale GWS changes, and provide important references for water resources management and decision making.