P40     Impact of cumulus parameterization schemes on the simulation of heavy rainfall event over the Korea Peninsula on 16 July, 2017.

Park, Haerin, Ulsan National Institute of Science and Technology

A comparison study of three CPSs, the Betts–Miller-Janjic (BM), Kain–Fritsch (KF) and Multi-scale Kain-Fritsch (MSKF) schemes, is investigated the sensitivity of the performance of the Weather Research and Forecasting (WRF v3.9.1) for heavy rainfall simulation. The date of the study was July 16, 2017, daily accumulated precipitation 290 mm over the Cheong-Ju.
Three sensitivity tests on CPSs tended to underestimate precipitation, and the rainband patterns differed from observational data. In temporal and spatial distributions of precipitation were more reasonably simulated by the MSKF scheme than other schemes (i.e., BMJ and KF schemes). In the temporal distribution of precipitation, the BM and KF schemes simulated the peak time of the precipitation 6 hours and 20 hours later than the observation, respectively, while the peak time in the experiment of the MSKF scheme was only 3 hours later. In term of the spatial distribution, the MSKF scheme adequately captured the narrow rainband zonally developed around the central region of South Korea. In contrast, the rainband was shifted northward by the BMJ and KF schemes. In the BM scheme, the low-pressure system inducing heavy rainfall was unrealistically influenced by the mid-level blocking system developed over the Kamchatka peninsula, and upper-layer jet stream by the KF scheme tended to exaggerate.