中国半干旱地区冰雹形成的微物理机制研究
投稿时间:2019-10-31  修订日期:2020-02-28  点此下载全文
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刘晓莉 南京信息工程大学大气物理学院 liuxiaoli2004y@nuist.edu.cn 
中文摘要:摘要:本文通过使用nudging方案对宁夏2017年6月7日的一次冰雹过程进行模拟,分析雷达回波特征、降水降雹情况、雹云发展条件和微物理转化特征,发现使用nudging地面和高空方案对模拟结果有改善,更加接近实况;雹云是由地形和午后局地加热作用触发对流形成,由地面风场从南方为雹云发展提供水汽,在沿着六盘山爬升过程中形成降雨降雹;冰雹形成在4-7km之间,有过冷水累积带存在;雨水的主要来源是霰融化,霰的融化和雨水下落过程的蒸发吸收了大量热量,形成了冷池。
中文关键词:WRF  Nudging  冰雹
 
The simulation study on a hail event occurs in semi-arid area of China
Abstract:Abstract: Although there are lots of studies on the convections, this kind of research should also be further considered in hail events happens in some special climate or terrain background area, like the semi-arid areas in West-North China, wherein the hail process may have different formation mechanism and microphysical cloud structures. A hail event in semi-arid China is been simulated, it is found that the microphysics in such convections do have some special characteristics. Form the simulations, it can be shown that the hail cloud is triggered by the topography and the local heating effect in the afternoon, and the southern surface wind provides water vapor for the development of hail cloud. The auto-conversion from cloud water to rain water is not very obviously in convection of such area. The hail is formed at 4-7 km in height, and there is a mixed zone of cloud water, hail, graupel and snow. The main source of rainwater is the melting of the graupel. The sublimation of snow and graupel, the melting of the graupel and the evaporation of the rainwater during falling process absorb a large amount of heat, which formed an obvious cold pool.
keywords:Hail event, Numerical simulation, Semi-arid area
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