地形、冷池出流和暖湿空气相互作用造成北京一次局地强降水的观测分析
投稿时间: 2016-01-15  最后修改时间: 2016-03-16  点此下载全文
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作者单位E-mail
章翠红 南京信息工程大学 chzhang_123@163.com 
夏茹娣 中国气象科学研究院灾害天气国家重点实验室  
王咏青 南京信息工程大学 yq.wang@163.com 
基金项目:国家重点基础研究发展计划(973计划)
中文摘要:利用地面和探空常规探测资料、多普勒天气雷达以及风廓线雷达资料,对2015年8月7日发生于北京的一次伴随有闪电和冰雹的突发性局地强降水过程的成因进行了分析。结果表明:这次过程发生在强层结不稳定环境中,对流层中层低槽配合低层切变线,促进河北西北部对流发展,并向东南方向移动,形成北京西北部短时强降水;北京中部地区强降水的直接制造者则是局地性新生的雷暴单体,由雷暴冷池出流和暖湿空气在边界层产生的碰撞和辐合所触发,北京西北部地形对冷池出流下山速度的加快、冷池出流高度的抬高及偏东暖湿气流的辐合抬升作用,也是局地雷暴新生的一个重要影响因子。
中文关键词:雷暴新生  复杂地形  冷池出流  暖湿气流  局地暴雨
 
Observational analysis of a local heavy rainfall in Beijing caused by terrain,cold pool outflow and warm moist air interactions
Abstract:The causes of a sudden local heavy rainfall with lightning and hail occurred in Beijing on 7 August, 2015 are investigated by composite analyses of surface and conventional sounding data, Doppler weather radar data and wind profile radar data . The following results are given: The heavy rain occurred in a strong unstable stratification. The middle level trough, lower-troposphere shear line and surface wind convergence facilitated the development of convection in northwest of Hebei that moved southeast. The direct producer of heavy rainfall over central Beijing was locally thunderstorms triggered by convergence between the cold pool outflow of pre-existing thunderstorms and the warm, moist southeast airflow in the boundary layer. The Taihang mountain in the northwest of Beijing accelerated downhill cold pool outflow and lift the thunderstorm cold pool outflow. Then, the cold westerly outflow overlapped above the warm and moist easterly flow near surface that increased the convective instability of atmosphere and contributed to the initiation of thunderstorms at the east side of the mountain.
keywords:Thunderstorm initiation  complex terrain  cold pool outflow  warm moist air  local rainstorm
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