A shrinkage-free approach for fusing GRACE-based total water storage changes with models using wavelet multiresolution analysis

•A multiresolution analysis approach for fusing TWSC from GRACE and GLDAS Noah model.•Large-scale information from GRACE is combined with small-scale components (<300 km) from model.•Fused dataset possesses small-scale features while maintaining basin-average TWSC.•Fused dataset provides groundwater estimates that outperform CLSM-DA.