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: 2017-03-16  点此下载全文
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作者单位E-mail
刘晓莉 南京信息工程大学 liuxiaoli2004y@nuist.edu.cn 
王琼 南京信息工程大学  
基金项目:国家自然科学基金面上项目(41375137),高原大气与环境四川省重点实验室开放课题(PAEKL-2014-C4),江苏省气象科学研究所北极阁基)
中文摘要:本文利用中尺度数值模式(WRFV3.4),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。微物理方案采用双参数Milbrandt-Yau 方案,此方案的粒子谱采用Gamma分布,而谱形参数α都取为固定值。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分布和与其相关的微物理过程,主要是霰的融化、雨滴蒸发、雨水和霰的碰撞、霰和云水的碰撞,而这两种粒子对降水起了主要作用,因此两种参数的变化导致降水分布以及量级的差异。
中文关键词:谱形参数  WRF模式  雨滴    数值研究
 
Numerical Study of Influence Of Rain And Graupel Size Distribution Shape on Heavy Rainfall In Yangtze-Huaihe Region
Abstract:In this paper, a heavy rainfall occurring in Yangtze-Huaihe River region during the plum rain season is simulated by using the mesoscale numerical model (WRFV3.4). Milbrandt-Yau scheme,a two-moment scheme,is chosen, which of the size distribution of each hydrometeor category is described by of a Gamma distribution law, and the spectral shape parameter α is fixed. To understand the effects of spectral shape parameter of raindrop and the graupel on the precipitation, the precipitation, the water content and the concentration distribution of the hydrometeors, the source and sink terms of the raindrops and the graupels are analyzed in several sensitivity experiment with different values of raindrop and graupel.spectral shape parameter.The results show that the variation of raindrop and graupel spectral shape parameters will affect the distribution of rainwater and graupel and the microphysical processes associated with them, mainly including the melting of the graupel, the evaporation of raindrops, the collision of rain and graupel, the collision of graupel and cloud water, and these two particles play a major role in precipitation, so the change of the two parameters leads to the difference of precipitation distribution and magnitude.
keywords:Spectral shape parameter  WRF  Raindrop  graupel  Numerical Study
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