doi:  doi:10.3878/j.issn.1006-9895.1806.18101

Theoretical Analysis and Numerical Study on the Development Mechanism of Squall Line in the Northeast Cold Vortex
摘要点击 964  全文点击 220  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
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)
      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.
主办单位:中国科学院大气物理研究所 单位地址:北京市9804信箱
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