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文章摘要
引用本文:张宁,苏爱芳,史一丛.2017.2014年一次飑线的发展维持原因分析.气象,43(11):1383-1392.
2014年一次飑线的发展维持原因分析
Causation Analysis of Evolution of a Squall Line in 2014
投稿时间:2016-07-17  最后修改时间:2017-02-23
DOI:10.7519/j.issn.1000-0526.2017.11.007
中文关键词: 飑线,环境条件,组织结构,触发机制
英文关键词: squall line, environment condition, organization structure, trigger mechanism
基金项目:全国强对流预报专家团队、河南省强对流预报创新团队、中国气象局预报员专项(CMAYBY2015 043)和中国气象局气象关键技术集成与应用面上项目(CMAGJ2015M36)共同资助
作者单位
张宁 中国气象局(河南)农业气象保障与应用技术重点实验室郑州 450003 
苏爱芳 中国气象局(河南)农业气象保障与应用技术重点实验室郑州 450003 
史一丛 河南省气象台郑州 450003 
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中文摘要:
      应用常规观测资料、区域自动站数据及多普勒雷达监测产品,对2014年7月29日豫北飑线的形成机制、结构特征及发展维持原因进行研究。结果表明:此次飑线过程发生在“槽前型”大尺度环流背景下。对流发生前,冷空气侵入高空槽前与低层发展的暖湿气流在对流潜势区叠加建立了不稳定层结。根据飑线的演变特征将其生命史分为组织发展阶段和再生阶段。在其组织发展阶段,东移高空槽和发展的地形辐合线是其主要驱动和组织触发机制。系统前沿阵风锋、主风暴及后部层云区形成的前侧入流与后侧出流共存、低层辐合与高层辐散共存的垂直环流,与水平方向上环境入流与系统出流共存并错开的环流体现了成熟期飑线高度的自组织结构特征,并形成了风暴发展的正反馈机制,正反馈机制的建立使其得以长期维持。另外,飑线与其他风暴发生对流合并也是其组织结构迅速增强的重要原因。在其再生阶段,豫东地区适宜的热力条件及中等以上强度垂直风切变条件对飑线的组织发展极为有利。飑线与北上的弓形回波发生对流合并使近地面形成中尺度雷暴高压,变压风与环境气流在中尺度湿区附近建立的辐合抬升运动为飑线再生提供了重要的触发机制。
英文摘要:
      In this paper, conventional meteorological data, AWS data and Doppler radar data are used to analyze the organization and formation mechanism, structure characteristics and evolution causation of a squall line in northern Henan on 29 July 2014. The results show that the squall line formed under the synoptic situation of pre trough. Before the convection, cold air invaded into the front of upper level trough and laid over the lower level warm airflow in potential convection area to form a favorable mesoscale unstable stratification. The process can be divided into organization evolution stage and regeneration stage. In the organization evolution stage, east moving upper level trough and mesoscale topographic convergence line are the main trigger systems. The vertical circulation structure of the coexistence of front inflow and back outflow, the coexistence of lower level convergence and upper level divergence, and the horizontal circulation structure of coexistence and derangement of ambient inflow and system outflow reflect the self organization characteristics of the squall line. This positive feedback mechanism leads to develop and preserve for a long time. Moreover, convective cloud mergering of squall line and other storms is the important reason why its local organization structure boosts quickly. In regeneration stage, favorable thermodynamic condition and stratification characteristics, especially the vertical wind shear with stronger than moderate intensity are extremely advantageous to the development of organization structure of the squall line. Convective clouds merger where bow echo is intersected into squall line forming a mesoscale thunderstorm high near the ground. The convergence lifting motion formed by isallobaric wind and environment airflow in mesoscale wet region offered an important trigger mechanism for the regeneration of the squall line.
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