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.