Abstract:This study conducts a high-resolution numerical simulation and sensitivity experiments on a typical landing convective storm that occurred on 8 August 2022, and investigates the impact of sea surface temperature (SST) variation on the intensity of landing convective precipitation by increasing and decreasing the SST of the Yellow Sea and Bohai Sea. The results show that, compared with the control experiment, the increased SST can enhance the intensity of landing convective precipitation. When SST is raised by 1℃ (2℃), the average accumulated precipitation in the coast increases by 2.6 mm (15.7 mm) and the maximum precipitation increases by 38.2 mm (53.7 mm). When SST is lowered by 1℃ (2℃), the corresponding precipitation decreases by 3.7 mm (8.3 mm), but the maximum precipitation does not show any significant changes. Mechanism analysis indicates that, relative to the control experiment, a rise of 2℃ SST significantly strengthens the coastal boundary layer temperature gradient, wind convergence lifting, as well as the intensity of convective available potential energy and southward-moving cold pools, leading to pronounced reinforcement of the front zone at the cold pool leading edge and dynamic lifting. In contrast, a rise of 1℃ SST does not evidently enhance boundary layer wind convergence and southward-moving cold pool intensity, which results in weaker enhancement of the front zone and dynamic lifting than that under the condition of 2℃ SST increase. When SST decreases by 1℃ and 2℃, the mesoscale environmental conditions and southward-moving cold pool intensity weaken substantially. The front zone at the cold pool leading edge becomes indistinct, and dynamic lifting is greatly weakened or even transformed into downdrafts, ultimately reducing the intensity of landing convective precipitation. The findings of this paper can provide a theoretical references for the intensity forecasting of landing convective precipitation.