Journal
REMOTE SENSING
Volume 15, Issue 16, Pages -Publisher
MDPI
DOI: 10.3390/rs15163967
Keywords
downscaling groundwater storage; GRACE gravity models; spectral combination; terrestrial water storage; uncertainty estimation
Ask authors/readers for more resources
This study addresses the challenge of quantifying uncertainties in the GLDAS model and enhancing the accuracy of downscaled GRACE data. A novel approach, referred to as method 2, is proposed to estimate uncertainties in the GLDAS model by incorporating parameter magnitudes. The results demonstrate substantial improvements in accuracy when comparing the downscaled TWS with measurements from piezometric wells, highlighting the potential of the proposed approach.
Accurately estimating hydrological parameters is crucial for comprehending global water resources and climate dynamics. This study addresses the challenge of quantifying uncertainties in the global land data assimilation system (GLDAS) model and enhancing the accuracy of downscaled gravity recovery and climate experiment (GRACE) data. Although the GLDAS models provide valuable information on hydrological parameters, they lack uncertainty quantification. To enhance the resolution of GRACE data, a spectral downscaling approach can be employed, leveraging uncertainty estimates. In this study, we propose a novel approach, referred to as method 2, which incorporates parameter magnitudes to estimate uncertainties in the GLDAS model. The proposed method is applied to downscale GRACE data over Alberta, with a specific focus on December 2003. The groundwater storage extracted from the downscaled terrestrial water storage (TWS) are compared with measurements from piezometric wells, demonstrating substantial improvements in accuracy. In approximately 80% of the wells, the root mean square (RMS) and standard deviation (STD) were improved to less than 5 mm. These results underscore the potential of the proposed approach to enhance downscaled GRACE data and improve hydrological models.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available