Predictability of Flood and Landfall Events Using Five-day GRACE/GRACE-FO Mascon Solutions from CSR

This research evaluates the short-term flood and landfall events using a new Five-day GRACE/GRACE-FO mascon solution developed by the Center for Space Research (CSR) at the University of Texas at Austin. The new solutions were developed without exogenous variables and depend solely on native GRACE gravity change measurements. The short-term mode of variability in the high-frequency signals was filtered and coupled with cumulative precipitation estimates from daily GPM products. We tested the predictability and flood detection from the five-day mascons and other standalone hydrologic models, i.e., CLM and ITSG-2018. The association between the five-day mascons, antecedent conditions, and cumulative precipitation indicates good spatial and temporal correspondence to extreme flood events. The five-day solutions open new frontiers for the gravimetry mission to map short-term changes in the terrestrial storages derived from extreme atmospheric events within a sub-monthly timescale.