doi:  doi:10.3878/j.issn.1006-9895.1806.18101
东北冷涡背景下飑线发展机制的理论分析和数值研究

Theoretical Analysis and Numerical Study on the Development Mechanism of Squall Line in the Northeast Cold Vortex
摘要点击 219  全文点击 104  投稿时间:2018-01-03  修订日期:2018-04-27
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基金:  国家重点基础研究发展计划,国家自然科学基金,江苏省高校自然科学研究重大项目,江苏省“333高层次人才培养工程”项目
中文关键词:  CM1云模式 东北冷涡 飑线 发展机制
英文关键词:  CM1 cloud mode, NECV, squall line, development mechanism
     
作者中文名作者英文名单位
张弛zhangchi南京信息工程大学
王咏青wangyongqing南京信息工程大学
引用:张弛,王咏青.2018.东北冷涡背景下飑线发展机制的理论分析和数值研究[J].大气科学
Citation:zhangchi,wangyongqing.2018.Theoretical Analysis and Numerical Study on the Development Mechanism of Squall Line in the Northeast Cold Vortex[J].Chinese Journal of Atmospheric Sciences (in Chinese)
中文摘要:
      在CM1模式动力框架基础上,推导出结合尺度分析得到的强对流天气发生发展的必要条件,并选择典型东北冷涡背景下的飑线过程,以200m的高精度水平网格距进行数值模拟和对比试验,验证理论结果的同时得到东北冷涡飑线形成的条件。通过模式数据做尺度分析,得到飑线系统中平流、对流以及沉降作用对水汽变量的影响最大,飑线的出现需要水汽分布和上升气流的配合,水汽相变影响次之,湍流作用相对较小。东北冷涡不同区域的模拟验证了理论分析的结果,冷涡西南侧受冷涡引导南下的冷空气影响,配合低层暖平流出现不稳定层结,结合有横向梯度的湿度场,可以形成飑线。在上升气流强的区域受水汽浓度和温度的影响在中高层容易形成强的雷达回波,两侧和积分一段时间后的低层受降水粒子沉降的影响在低层也会出现强的雷达回波。
Abstract:
      Based on the dynamic frame of CM1 model, the necessary conditions for the occurrence and development of severe convective weather are obtained by theoretical derivation and scale analysis. A typical squall line process under the background of Northeast Cold Vortex (NECV) is selected, and the numerical simulation and contrast test were carried out with a high precision horizontal grid distance of 200m. The theoretical results were verified and the conditions for the formation of a squall line under the NECV were obtained. Through the scale analysis of mode data, we can get that the advection, convection and the hydrometeor precipitation have the greatest influence on the change of moisture variables in squall line system, the influence of water vapor phase change is the second, and the turbulence effect is relatively small, so the emergence of squall line needs the cooperation of water vapor distribution and the ascending air flow. The simulation of different regions of NECV verifies the results of theoretical analysis. In the southwest side of the NECV, upper layer is affected by the cold air, combined with the warm advection in lower layer, the unstable stratification occurs, and then combined the humidity field with transverse gradient, squall line can be formed. Under the influence of water vapor concentration and temperature, strong radar echo is easily formed in the middle and high level with strong updraft, and affected by precipitation, strong radar echo can also be found in the lower layer.
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