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气象:2015,41(7):833-841
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华北冷季一次大范围雷暴与暴雪共存天气过程分析
(河北省气象台,石家庄 050021)
Diagnostic Analysis of One Widespread Thunderstorm Coexisting with Snowstorm in North China in March 2013
(Hebei Meteorological Observatory, Shijiazhuang 050021)
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投稿时间:2014-04-15    修订日期:2015-04-10
中文摘要: 利用常规气象资料、多普勒雷达及NCEP客观分析资料,对2013年3月12日华北出现的一次比较罕见的大范围雷暴和暴雪共存天气过程进行了诊断分析。结果表明:本次大范围的雷暴为发生在低层冷空气堆之上的高架雷暴。虽然雷暴区中低层水汽通量辐合较弱,但中高层θe平流差造成中层出现条件不稳定,在850 hPa切变线前部西南风中辐合配合冷平流以及切变线的先后触发下,不稳定能量得以释放,这是河北中部发生大范围雷暴的主要原因。暴雪区中层较强的水汽通量辐合及辐合层厚度爆发性增长、700 hPa槽区以及槽前西南气流和偏西气流的强辐合是造成北部暴雪天气的重要原因。此外,中低层正的差动涡度平流较散度场对暴雪及雷暴区的动力作用的反映更明显。
Abstract:A relatively rare process of widespread thunderstorm coexisting with snowstorm was analyzed by adopting conventional meteorological data, CINRAD radar data, and NCEP analysis data. The results are as follows. The widespread thunderstorm was an elevated thunderstorm over the low level cold air mass. Although low level convergence of moisture flux was weak over the thunderstorm area, the deep warm advection formed over Hebei, and decreased with height in the middle upper troposphere, leading to conditional instability. The 850 hPa shear line and convergence zone in the southwest airflow caused convective instability energy to release. Strong moisture flux convergence was suddenly thickened around the middle troposphere in the north of Hebei, and the strong convergence of southwest airflow and west airflow in the front of the 700 hPa trough formed, which led to heavy snowfall in central Hebei. In addition, at the middle lower level, positive differential vorticity advection was more distinct than divergence in expressing dynamic action.
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基金项目:公益性行业(气象)科研专项(GYHY201306008)资助
引用文本:
孔凡超,李江波,张迎新,买文明,2015.华北冷季一次大范围雷暴与暴雪共存天气过程分析[J].气象,41(7):833-841.
KONG Fanchao,LI Jiangbo,ZHANG Yingxin,MAI Wenming,2015.Diagnostic Analysis of One Widespread Thunderstorm Coexisting with Snowstorm in North China in March 2013[J].Meteor Mon,41(7):833-841.