Intercomparison, Fusion and Application of FY-3E/WindRAD and HY-2B/SCA Ocean Surface Wind Products for Tropical Cyclone Monitoring

Ocean surface wind vector (OWV) is a key variable for ocean remote sensing and tropical cyclone (TC) monitoring. This study presents the first comprehensive intercomparison of Ku-band OWV products from FY-3E/WindRAD and HY-2B/SCA scatterometers using full-year 2022 data (583,805 spatiotemporal collocations), with both sensors sampling the morning–evening local-time sector in sun-synchronous orbits. Results indicate strong agreement in wind speed (R = 0.95; mean bias −0.47 m s⁻¹; RMSE 1.30 m s⁻¹) and wind direction (mean bias −0.47°; SD 33.7°; most differences within ±20°), with the highest consistency across Beaufort scale 3–8 (B3–B8). A fusion leveraging FY-3E’s fine resolution and HY-2B’s wide coverage is implemented and applied to Super Typhoon Hinnamnor (2022), enhancing spatial coverage and structural detail of TC winds. Quadrant 34-kt wind radii (R34) are estimated from fused fields and evaluated against Joint Typhoon Warning Center (JTWC) best-tracks data, showing close agreement during compact, symmetric TC stages but larger differences during structural reorganization. Overall, the findings confirm inter-satellite consistency for the two Chinese scatterometers and demonstrate the practical value of a multi-source fusion approach that benefits TC mon-itoring, wind-radii estimation, and marine weather services.