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This study used three GRACE mascon (mass concentration) solutions from JPL, CSR, and GSFC and was accessed from the Center for Space Research (CSR) at The University of Texas through its data portal (http://www2.csr.utexas.edu/grace/RL05_mascons.html). Generally, Mascons solves for monthly gravity field variations in terms of a 120‐km wide mascon block (Save et al., 2016, Wiese et al., 2016, Watkins et al., 2015). GRACE solutions based on the so‐called mascon from different processing centers at the Center for Space Research (CSR), the Goddard Space Flight Center (GSFC), and Jet Propulsion Laboratory (JPL) were considered for estimating TWS fields. The CSR solution describes the global mass changes expressed in TWS solved for 40,962 cells in which each has an approximately 12,400 km² with the average distance of about 120 km between the cells and finally resampled into 0.5°×0.5° (Save et al., 2016). The GRACE GFSC mascon solution is solved for 1°×1° equal‐area grid blocks, in which there are 41,168 mascon blocks covering the entire globe with mean area of 12,389 km (Luthcke et al., 2013). The JPL mascon solution solves for monthly gravity field variations in terms of 4,551 equal‐area 3‐degree spherical cap mascons covering the time of April 2002 to June 2017 and are also resampled into a fine resolution of 0.5°×0.5° (Watkins et al., 2015).