In order to investigate the influence of various parameterization schemes in different physical processes on rainstorm simulation, the numerical simulation and a series of sensitive experiments are carried out to the typical heavy rainstorm in Jiuquan of Gansu province on June 4-5 2012 by using the Weather Research and Forecasting Model (WRFV3.2) with a series of cumulus parameterization scheme and microphysics scheme combination. The study is performed by using the meteorological observational data and the FNL 1°×1° six hours reanalyzed data. Comparison and analysis research of different scheme combinations'simulating effect is given in this paper, and the contrastive analysis is made with precipitation and rainfall area. The results show that, WRF has a strong simulating ability for precipitation and flow field variation as well as has a good capacity to predict the mesoscale weather systems. The extended directions of rainstorm belts has been simulated accurately by all the scheme combinations, but the positions of the heavy rainfall centers souther than the reality. The sensitivity of microphysics schemes to the rainfall simulation was significantly higher than that of cumulus parameterization schemes. The simulations were closer to the reality with 18 km fine horizontal resolution. In general, Betts-Miller-Janjic and WRF-Single-Moment-5-class (BMJ-WSM5) schemes performed better. ETS skill score confirmed that as well. WRF can also well simulate physical quantity fields of this rainstorm. The diagnostic analyses of vertical speed, vorticity, divergence, and the rain mixing ratio are carried out, then, the role of the cumulus parameterization schemes and microphysical schemes in rainstorm forecast can be better understood. These sesults will be beneficial for finding out the causes for rainstorm.
WANG Tiantian
,
GAO Xiaoqing
,
YIN Xianzhi
,
WANG Yanfeng
,
WANG Rong
. Effects of Parameterized Physical Processes of WRF Model on Simulation of Rainstorm in Jiuquan, Gansu Province[J]. Plateau Meteorology, 2016
, 35(5)
: 1257
-1269
.
DOI: 10.7522/j.issn.1000-0534.2015.00096
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