雨滴和霰谱形参数对江淮地区强降水影响的数值研究
投稿时间: 2016-11-14  最后修改时间: 2017-04-21  点此下载全文
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刘晓莉 南京信息工程大学 中国气象局气溶胶-云-降水重点开放实验室, 江苏 南京 210044 liuxiaoli2004y@nuist.edu.cn 
王琼 南京信息工程大学 中国气象局气溶胶-云-降水重点开放实验室, 江苏 南京 210044  
基金项目:国家自然科学基金资助项目(41375137);高原大气与环境四川省重点实验室开放课题资助项目(PAEKL-2014-C4);江苏省气象科学研究所北极阁基金资助项目(BJG201304);气象灾害省部共建教育部重点实验室(南京信息工程大学)开放课题资助项目(KLME1205)
中文摘要:利用中尺度数值模式WRF-V3.4,对发生在江淮地区梅雨期一次强降水天气过程进行了数值模拟,并针对雨滴和霰粒的谱形参数不同取值做了敏感性试验,分析了谱形参数对降水量、水凝物比含水量、数浓度和粒径分布以及雨滴和霰的源汇项等的影响。结果表明,雨滴和霰谱形参数的变化会影响雨水和霰粒的比含水量和数浓度分布,因为这两个参数的变化会影响雨水和霰的相关微物理过程。当雨滴谱形参数增大时,雨水蒸发量先增大后减小,霰与云水的碰撞也减小;当霰谱形参数增大时,主要使霰融化成雨水的量减少,因此导致降水分布以及降水量级的差异。
中文关键词:谱形参数  WRF模式  雨滴    数值研究
 
Numerical study on the influence of rain and graupel size distribution shape on heavy rainfall in the Yangtze-Huaihe Region
Abstract:In this paper,a heavy rainfall occurring in the Yangtze-Huaihe River region during the plum rain season is simulated using the mesoscale numerical model(WRF-V3.4).The Milbrandt-Yau scheme,a two-moment scheme,is chosen,in which the size distribution of each hydrometeor category is described by a Gamma distribution law,and the spectral shape parameter α is fixed.In order to understand the effects of the spectral shape parameters of the raindrops and graupel on the precipitation,the precipitation,water content and concentration distribution of the hydrometeors,as well as the source and sink terms of the raindrops and graupel,are analyzed through several sensitivity experiments with different values of raindrops and graupel,and different spectral shape parameters.The results show that the distribution of raindrops and graupel is greatly affected by the spectral shape parameters thereof,as it can affect the micro-physical processes associated with rainwater and graupel.When the spectral shape parameters of the raindrops increase,the raindrop evaporation first increases then decreases,while the collision of the graupel and clouds also decreases.At the same time,when the spectral shape parameter of the graupel increases,the graupel melting decreases.Therefore,the change of the two parameters leads to differences in precipitation distribution and magnitude.
keywords:Spectral shape parameter  WRF  Raindrop  graupel  Numerical Study
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