万夫敬,孙继松,孙敏,梅婵娟,杨凡. 2021. 山东半岛海风锋在一次飑线系统演变过程中的作用[J]. 气象学报, (0):-, doi:10.11676/qxxb2021.056
山东半岛海风锋在一次飑线系统演变过程中的作用
The Roles of Sea Breeze Fronts over Shandong Peninsula during Squall Line Evolution
投稿时间:2021-03-11  修订日期:2021-05-17
DOI:10.11676/qxxb2021.056
中文关键词:  飑线,极大阵风,海风锋,断裂与重组
英文关键词:squall line, extreme gale, sea breeze front, broken and re- organization
基金项目:
作者单位邮编
万夫敬 中国气象科学研究院灾害天气国家重点实验室
青岛市气象局 
100081
孙继松 中国气象科学研究院灾害天气国家重点实验室 100081
孙敏 上海中心气象台 200030
梅婵娟  264200
杨凡 青岛市气象局 266003
摘要点击次数: 184
全文下载次数: 191
中文摘要:
      2016年6月30日生成于华北南部的一次长生命史的强飑线过程,造成了山东地区大范围风雹天气。本文利用常规观测资料、区域自动站观测数据及雷达监测产品,分析了山东半岛复杂的海风锋特征在这次飑线系统的断裂、再组织化以及极端大风、冰雹灾害形成过程中重要作用。结果表明:(1)初始对流是在地面冷锋辐合线上触发的弱对流,在对流系统向更不稳定区域移动时与水平对流卷相交,对流迅速发展,并组织成东西走向的直线型飑线。(2)飑线系统在平原地区继续向前移动的过程中发生断裂,这一过程与渤海湾在黄河三角洲形成的两条移动方向不同的海风锋以及飑线系统的阵风锋有关:向内陆推进的两条海风锋与阵风锋在飑线系统中段的前部相交,诱发新生单体,造成该处对流系统更快速的向前传播,最终导致飑线系统断裂;与此同时断裂后的西段风暴因低层暖湿入流被切断而逐渐减弱。(3)断裂后西段残留风暴系统出流阵风产生的新生风暴向东北方向发展,与断裂后的东段风暴的后向传播(向西南方向发展)机制相互作用,完成了飑线的再次组织化,形成了具有典型弓状特征、水平尺度更大、近似于东北—西南走向的飑线系统。(4)长生命史飑线系统造成的极端雷暴大风和最大冰雹出现在飑线再组织化初期,位于飑线系统“弓部”位置,地面极端雷暴大风是冷池密度流、后侧入流急流和水物质对应的前侧下沉气流共同作用的结果,其中与后侧入流急流几乎完全分离的、与水物质对应的前侧下沉气流在这次极端地面大风发生时可能起到了重要作用。(5)山东半岛东侧的黄海海风锋向内陆推进(东南向西北)过程中与自西北向东南移动的飑线相遇,加强了风暴前侧的抬升、水汽供给和组织化程度,为飑线的长时间维持提供了有利条件。
英文摘要:
      Abstract: Based on Doppler weather radar products, conventional and intensive observation data, the important roles of complicated sea breeze fronts over Shandong Peninsula on the breaking and reorganizing process of a squall line with a long life on June 30, 2016,?as well as the formation of extreme gale and hail disaster, were investigated. The results indicated that: (1) the initial weak convective cells were triggered on the cold front convergence area. When they intersected with the horizontal convective rolls as the convective system moving towards the more unstable area, the convection developed rapidly. The developing convective cells were gradually organized into a linear squall line with an east-west direction. (2) The squall line broke off during moving forward in plain, which was related with the squall line gust front and two sea breeze fronts with different moving directions formed in the Yellow River Delta against Bohai Bay: Two sea breeze fronts intersected with the middle section of the gust front, which induced new convective cells and caused the convective system to propagate forward more rapidly. Finally, the squall line system broke. At the same time, the western section of the broken squall line weakened gradually since the warm and wet inflow at the lower level was cut off. (3)The newly born cell developed to the northeast, which was triggered by outflow of the west residual storm and separated from it; meanwhile others formed in the tail of the eastern original storm (propagated to the southwest). The re-organization process finally formed a new squall line with typical bow characteristics, larger horizontal scale, and similarly northeast - southwest direction. (4) The extreme gale and the maximum hailstorm during the storm activity appeared at the early stage of re-organization of the squall line, located at the "bow" of the squall line. The extreme gale on the ground was comprehensive effect from cold pool density current, the rear inflow jet and the front downdraft, which was completely separated with rear inflow jet and corresponded with water material falling, and the falling water material play an important role during the extreme gale. (5) The Yellow Sea breeze front on the east side of Shandong Peninsula encountered the squall line moving from northwest to southeast, which strengthened the uplift, water vapor supply and organization degree of the front side of the storm, and provided favorable conditions for the long-term maintenance of the squall line.
查看全文   查看/发表评论  下载PDF阅读器
分享按钮