Improving the spatial resolution of GRACE satellites based on high-resolution hydrological simulations

doi:10.13474/j.cnki.11-2246.2022.0230

Abstract

Abstract: To overcome the limitation of the coarse spatial resolution of GRACE observations, this study selects PCR-GLOBWB simulations as the reference data with higher resolution. Three kinds of downscaling schemes are employed to improve the resolution of GRACE data in Hebei province from 0.50° to 0.05°, namely add weight downscaling method (AWDM), multiply weight downscaling method (MWDM), and error distribution downscaling method (EDDM), respectively. The results indicate that the AWDM-based scheme can not only preserve the original spatial characteristics of GRACE observations, but also give signals at local areas. Although the EDDM-based scheme can also provide ideal downscaled results, there are obvious jumps with regard to the signals between the junction of different pixels. In contrast, the worst performance is observed in the MWDM-based scheme, which is significantly different from the actual GRACE signals. In-situ groundwater level measurements highlight that the AWDM-based downscaling scheme is superior to other downscaling methods, and can provide reasonable downscaling performance with the correlation up to 0.81. This study provides an effective guarantee for obtaining high spatial resolution groundwater storage data in Hebei province.

Key words: GRACE satellites, PCR-GLOBWB, downscaling, groundwater storage, Hebei province

CLC Number:

P237

LIU Hongliang, ZHANG Gangqiang, ZHANG Dasheng, YIN Wenjie, MENG Xiangbo. Improving the spatial resolution of GRACE satellites based on high-resolution hydrological simulations[J]. Bulletin of Surveying and Mapping, 2022, 0(8): 41-47.

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