Impact of Horizontal Resolution and Cumulus Parameterization Scheme on the Simulation of Heavy Rainfall Events over the Korean Peninsula

In this paper, we present the results of high-resolution numerical simulations of three heavy rainfall events over the Korean peninsula. The numerical results show that the prediction accuracy for heavy rainfall events improved as horizontal resolution increase. The fine-grid precipitation fields are much closer to the real precipitation fields in the case of large synoptic forcing over the Korean peninsula. In the case of large convective available potential energy (CAPE) and weak synoptic forcing, it seems that even when using high resolution, the models show poor performance to reproduce the observed high precipitation amounts. However, the activation of the cumulus parameterization scheme in the intermediate resolution of 9 km, even at grid spacing of 3 km, had a positive impact on the simulation of heavy rainfall event.