Abstract:To analyze the impact of the three-moment cloud microphysics scheme IAP-LACS on the simulation of sea fog along the coast of Zhejiang Province, this paper selects two two-moment cloud microphysics schemes (Morrison05 and Thompson08) from the WRF model for comparison. A high-concentration, wide-range, and high-impact sea fog event along the coast of Zhejiang in April 2021 is simulated and analyzed by these schemes. Moreover, Stoelinga-Warner (SW99) algorithm and NOAA/FSL algorithm are used to conduct visibility diagnosis. The results indicate that the three schemes can all simulate the occurrence of this sea fog event, but differences remain in terms of fog intensity and spatial extent. The IAP-LACS scheme performs best in simulating both the spatial distribution and intensity of the fog, achieving the highest TS score. The FSL algorithm outperforms the SW99 algorithm in diagnosing the spatial extent of the fog but is less accurate in representing its intensity. The IAP-LACS scheme can more accurately simulate the large-value areas of low-level cloud water content in the Zhoushan Islands and the Taizhou-Wenzhou coastal region. It can also better capture the magnitude and increasing trend of cloud water content along the Sanshan Sluice coastal area from 22:00 BT 1 to 00:00 BT 2 April. The improvement in simulating low-level cloud water content by the IAP-LACS scheme is a key factor in enhancing the forecast accuracy of this sea fog event. Compared to the other two schemes, the IAP-LACS scheme has the advantage of providing cloud droplet number concentration output. The output of visibility diagnostic scheme based on both cloud droplet number concentration and cloud water content results is closer to observations in terms of fog extent and intensity.