ANALYSIS OF THE IMPACT OF DIFFERENT MICROPHYSICS PARAMETERIZATION SCHEMES IN SIMULATING HEAVY RAINFALL OVER SHANGHAI
KAN Yu
LIU Chao-shun
QIAO Feng-xue
SHU Jiong
LIU Yan-an
DING Yang
Abstract：In order to study the impact of physics parameterization schemes in the WRF model on rainstorm simulations,two typical heavy rainfall events ("0825" and "0913") over Shanghai are simulated.The study was carried out with BMJ cumulus parameterization scheme and three physics parameterization schemes (Lin et al,WSM5 and WSM6 scheme) under three horizontal resolutions of 36 km,12 km and 4 km.The results indicated that all three physics schemes generally simulated the precipitation well,but they still differ in rainfall areas,rainfall center and intensity.By using the measured precipitation data of ground stations and the hourly rainfall grid data integrated from automatic stations and CMORPH,the paper analyzed the impact of different physics schemes on precipitation from the rainfall area,center and intensity,combined with K index,relative humidity,vertical velocity,vorticity,divergence and other physical diagnosis.Furthermore,the paper compared the difference among the three physics parameterization schemes,and explained the difference of the results by using the vertical profile of qsnow,qice and qgraupel.The results showed that the micro-physical WSM5 scheme can better simulate the rainfall area,but get heavier rain than the observation,and WSM6 can well simulate the rainfall intensity but drift a little in rainfall area,andthe simulated rainfall area of Lin has a drift.
Keywords：WRFphysics parameterization schemesheavy rainfallShanghai
Publication Date：2017-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：16( 399-414 )