GRACE and GRACE Follow On: On Accurate estimation of Groundwater Storage Change from Satellite Gravimetry and Beyond

This study validates mascon (3°) and downscaled (0.5°) GRACE TWSA products using in-situ groundwater observations across India. We improve the downscaling approach of Vishwakarma et al. (2021) by imposing mass conservation at the GRACE mascon scale, enhancing spatial representation while preserving mass consistency. The proposed product is evaluated against existing downscaled datasets and is publicly available through Figshare.  

Several GRACE downscaling products already available for regional analysis owing to its coarse resolution (~3°). But they lack validation (both original GRACE and downscaled product). Here for the first time, we have validated both, Original GRACE and downscaled product. Along with developed a new product which is outperforming the existing products over most of the parts of India. Thereby, we are offering a valuable tool for regional water resource analysis.