Influences of convective parameterization schemes on the Simulation of air-sea phase relationship in East Asian summer monsoon region

摘要

In this study, the sensitivities of convective parameterization schemes(CPS) to the air-sea phase relationship in the east Asian summer monsoon region are investigated using a coupled regional climate model RegCM-POM. The east Asian summer monsoon climate from May to October in 1998 are simulated with two different CPSs, namely, the Grell scheme and the MIT-Emanuel scheme(EMU). Then the simulated precipitation-SST phase relationship and the sea surface heat flux(SSHF)-SST phase relationship derived by the Grell simulation and EMU simulation are compared, finding that the EMU simulation shows a superiority to the Grell simulation, especially in the south China sea(SCS) and the East China sea(ECS), indicating a more reasonable amplitude and phase of the lead lag precipitation-SST and SSHF-SST correlation coefficients. The reason for this phenomenon lies in that the convective precipitation(CP) produced by EMU scheme is more realistic, and the simulated SST is more coherent with the observation which benefits from the EMU through the interaction of the convective process and the oceanic process.