Global daily 0.01° land precipitable water vapor dataset

It was generated by fusing synchronized observations from the Medium Resolution Spectral Imager (MERSI) and the Microwave Radiation Imager (MWRI) onboard Fengyun-3D (FY-3D). The dataset combines the spatial continuity of GNSS-enhanced MWRI PWV retrievals with the fine-scale structure of quality-controlled MERSI near-infrared PWV retrievals through a progressive multi-scale attention fusion model (PSAFM).

Validation against ERA5 reanalysis, GNSS observations, and radiosonde measurements shows reliable performance, with RMSEs of 2.9, 2.7, and 3.2 mm and correlation coefficients of 0.95, 0.96, and 0.93, respectively. SC-GLPWV1km 1.0 provides spatially continuous, kilometer-scale PWV fields over global land areas, including improved continuity under cloudy conditions, and supports studies of water vapor transport, extreme precipitation, climate change, land-atmosphere interactions, and the hydrological cycle.