Abstract:The paper discusses the coordinate influence of CODAS-SST and the assimilated FY-4A temperature profiles on sea fog simulation with WRF model around the Yellow-Bohai Sea. The analyses show that the high-resolution CODAS-SST can significantly improve the results of sea fog simulation with WRF model around the Yellow-Bohai Sea, which makes the range and intensity of simulated fog more reasonable. By analyzing the sensitivity of various elements in the foggy area to change in SST, we have clarified that the 2 m temperature and specific humidity, as well as the sensible heat, latent heat, and water vapor fluxes at the sea-air interface, exhibit varying degrees of positive correlation with SST, while the liquid water content shows a significant negative correlation with SST. The assimilation of FY-4A vertical sounding data can further optimize the vertical distribution of specific humidity and wind speed in the boundary layer of WRF model, improving the vapor transport and liquid water content. Therefore, the coordinate assimilation of FY-4A vertical sounding data and CODAS-SST can better simulate the mesoscale characteristics of fog area, which indicates the high-precision and high-resolution ocean observation data are beneficial for improving the numerical simulation capability of sea fog.