CCN数浓度及参数化方案对一次层云降水过程影响的数值研究
投稿时间: 2016-10-27  最后修改时间: 2016-10-27  点此下载全文
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作者单位E-mail
全鑫 南京信息工程大学 947052027@qq.com 
李艳伟 南京信息工程大学 liyw@nuist.edu.cn 
基金项目:41275152国家自然科学基金项目(面上项目,重点项目,重大项目)
中文摘要:利用中尺度WRF模式(V3.7),采用WDM6双参数微物理方案,对2014年7月26日12时-7月28日06时发生在华东地区附近的一次层状云降水天气进行数值模拟。通过改变模式中初始云凝结核(CCN)数浓度及参数化方案,进行敏感试验,对模拟结果进行对比分析。改变CCN数浓度的结果表明,CCN数浓度对降水的影响复杂、非线性,随着CCN数浓度的增大,降水量先增加后减小。云水、霰混合比始终增加,雨水、冰晶混合比均表现为先增加后减小的趋势,雪晶混合比则呈现增加、减小再增加的趋势;改变CCN参数化方案的结果表明,两者模拟降水落区有差别,三参数方案更接近实际;双参数方案的结果显示暖云降水加强,冷云降水略弱,三参数方案的结果显示暖云降水较弱,冷云降水较强。
中文关键词:CCN  参数化方案  层状云降水
 
Numerical simulation of impact of Cloud Condensation Nuclei number concentration and parameterization schemes on precipitation from straitiform clouds
Abstract:The WDM6 two-parameter microphysical scheme is incorporated into the mesoscale WRF (V3.7) to simulate a stratiform precipitation over the East China region from 12:00 July 26, 2014 to 6:00 July 28, 2014. By changing the number of initial cloud condensation nuclei (CCN) in the model and the parameterization scheme, sensitivity experiments are used to analysis the simulation results.. The results show that the influence of CCN concentration on precipitation is complex and nonlinear. With the increase of the concentration of CCN, the precipitation increases first and then decreases. The mixing ratio of cloud water and graupel always increases, and the mixing ratio of rainwater and ice crystal increases first and then decreases, and the mixing ratio of snow crystals increases, decreases and then increases. The change of CCN parameterization scheme shows that there are differences between the two simulated precipitation areas, three - parameter scheme is closer to reality;The results of the two-parameter scheme show that the precipitation of warm cloud is enhanced and the precipitation of cold cloud is slightly weaker. The results of three-parameter scheme show that the precipitation of warm cloud is weaker and the precipitation of cold cloud is stronger.
keywords:cloud condensation nuclei  parameterization scheme  stratiform cloud precipitation
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