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Conference Paper

Contrasting behavior of July 2021 floods in Western Europe and Central China revealed by GRACE Follow-On ranging data

Authors

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

Li,  Hao-si
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

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Citation

Yi, S., Li, H.-s. (2023): Contrasting behavior of July 2021 floods in Western Europe and Central China revealed by GRACE Follow-On ranging data, XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) (Berlin 2023).
https://doi.org/10.57757/IUGG23-1877


Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5017704
Abstract
The conventional monthly resolution of global gravity products from the Gravity Recovery and Climate Experiment (GRACE) and its successor GRACE Follow-On (GFO) greatly impedes their application to transient extreme climate events like floods. Nevertheless, this study utilizes the line-of-sight gravity difference between the twin GRACE satellites, reflecting the instantaneous surface mass changes below, to obtain water mass changes at a resolution of days. This study investigates two floods in July 2021 in Western Europe and Central China (CC), respectively, and the high-resolution results clearly present the temporal progression of the floods up to a maximum of about 40 Gt. However, the GFO-derived water gain in CC is much lower than expected. We speculate that intense human manipulation of water resources mitigated the repercussions of the flood in CC. This study presents the feasibility of GFO application in fast-evolving climate events and highlights the effectiveness of countermeasures by humans to flood hazards.