Mapping terrestrial water storage changes in Canada using GRACE and GRACE-FO

This study focused upon the estimation and analysis of terrestrial water storage (TWS changes) across Canadian landscape. The was performed using Gravity Recovery Climate Experiment (GRACE) data from April 2002 to June 2017, GRACE Follow-On (GRACE-FO) observations 2018 December 2019. Removing gravity effects Glacial Isostatic Adjustment (GIA) signals leakage is required have realistic estimations TWS changes in landmass. In this study, GIA correction based on a regional-scale modeling uplift rate. To evaluate performance compared latest models, comparison made rate derived 149 GPS stations over area. Refined showed strong seasonal patterns (between ?160 mm 80 mm). slope trend positive (6.6 mm/year) for period combining both GRACE-FO. increases 45 mm/year 17-year central Canada, especially regions surrounding Hudson Bay. For GRACE, maximum variations occurred between February April; GRACE-FO, it with 2-month lag earlier during short being considered. Uncertainties that were by increased towards end mission. Uncertainty GRACE-FO lower than at beginning GRACE. extracted used approach Mascon solutions products (GRCTellus JPL MSCNv02 CSR MSCNv02), two steps: 1) Water Global Assessment Prognosis hydrological model (WGHM), 2) in-situ precipitation potential evapotranspiration data. all cases our provided best correlations root mean square errors, products.