Performance of GPCP Daily Products Over Oceans: Evaluation Using Passive Aquatic Listeners

Passive Aquatic Listeners (PALs) have been increasingly deployed to collect minute-scale surface oceanic rainfall and wind information, with a sampling area similar the spaceborne sensor footprints. This provides an unprecedented opportunity validate satellite precipitation products over oceans. study evaluates Global Precipitation Climatology Project (GPCP) daily products, including widely used GPCP v1.3 newly released v3.2, oceans using 58 PALs as references. The shows that performance depends on time scale, region, intensity. two versions of perform similarly at multi-year monthly scales, while v3.2 substantial improvements in representing rain occurrence intensity scale. results also highlight challenge measurement certain regions such tropical Southeastern Pacific extratropical North Pacific, where both but exhibit noticeable differences compared PAL observations.