污染气溶胶对山西一次降水过程影响的数值模拟  

A Numerical Study of Polluted Aerosol Effects on Precipitation in Shanxi Province

作　　者：肖辉[1] 银燕[1] 

机构地区：[1]南京信息工程大学气象灾害省部共建教育部重点实验室,南京210044

出　　处：《大气科学》2011年第2期235-246,共12页Chinese Journal of Atmospheric Sciences

基　　金：科技部公益性行业(气象)科研专项经费GYHY200706036;国家科技支撑计划课题2006BAC12B07;江苏省"333人才工程"项目;江苏省高校优秀创新团队项目

摘　　要：利用耦合Morrision双参数物理方案的WRF(Weather Research and Forecasting)中尺度数值模式,对发生在2007年6月13日山西地区的一次强降水过程进行了模拟,并对清洁和污染背景下气溶胶对云微物理结构和降水变化的影响进行了敏感性试验和对比分析。结果显示:污染背景下,降水区域没有明显变化,中心强度变强,网格平均降水量比清洁背景少0.8%;雪和霰是雨水的主要来源,高浓度气溶胶背景下,前期暖云降水减弱,后期大量雪粒子与云中云滴和雨滴碰并增长,造成降水增强。A rainstorm occurring in Shanxi Province on 13 Jun 2007 is simulated using the Weather Research and Forecasting（WRF） mesoscale model coupled with the Morrision＇s double-moment bulk microphysical scheme.Sensitivity tests are conducted and compared for different background conditions to understand the response of cloud microphysical processes and precipitation to changes in concentrations of aerosol particles.The results show that the total rainfall amount is reduced by about 0.8% in the polluted case as compared with the clean case,but a more intensive rainfall rate in the central region of the rain area and no significant change in the rainfall area are observed in the former case than in the latter.Snow crystals and graupel are the main sources for rain at the surface.In the polluted case considered here,higher concentration of aerosol particles leads to the decrease of warm rain at the early stage,and consequently more numerous snow particles can grow by coagulations with cloud droplets and rain droplets in the air for longer,intensifying precipitation at the later stage.

关 键 词：中尺度数值模拟 气溶胶 WRF(WeatherResearchandForecasting)模式 微物理过程 

分 类 号：P458.121[天文地球—大气科学及气象学]