Journal of Arid Meteorology

Previous Articles     Next Articles

Environmental Conditions and Doppler Radar Characteristic of Two
Consecutive Severe Convection Weather in Shandong Province

ZHANG Qin1, ZHANG Xiao2, MENG Wei1, LI Shuling1, HU Xiaolin1   

  1. 1. Zibo Meteorological Bureau of Shandong Province, Zibo 255048, Shandong, China;
    2.State Key Laboratory of Numerical Modeling of Atmospheric Sciences and Geophysical
    Fluid Dynamics, Institute of Atmospheric Physics, Beijing 100029, China
  • Online:2018-06-30 Published:2018-06-30

山东连续两次强对流天气的环境条件和多普勒雷达特征

张琴1张晓2孟伟1李淑玲1胡晓琳1   

  1. 1.山东省淄博市气象局,山东淄博255048;2.中国科学院大气物理研究所,
    大气科学和地球流体力学数值模拟国家重点实验室,北京100029

Abstract:

This paper analyzed the environment and structure of synoptic-scale systems for two severe convections occurring in Shandong Province by using NCEP/NCAR reanalysis data, Doppler radar data and sounding data. The results showed that the high-level cold vortex, descending cold trough and the near surface cyclone caused the two convections. The lower temperature, stronger coupling between the upper and lower-level jets, more obvious heterogeneous structure and better vapor condition caused a stronger convection in process II. Temperature advection in upper and lower level had good correspondences with hail falling area in two processes. In process I, the high energy area at low level was stronger. While in process II, the downward extension of funnel-shaped θse in upper level was stronger and the isoline of θse was denser, which led to a stronger development of severe convection weather. Centroid of the squall lines appeared at the low level at their nascent and development stages, and it appeared at high level during their maturity stage. Both supercells and severe convective cells could lead to hail falling, but some differences existed between their structures.

Key words: atmospheric energy structure, squall line, supercells

摘要:

利用NCEP/NCAR再分析资料、多普勒雷达资料和探空资料等,对发生在山东境内的2次强对流天气过程的环境场条件及中小尺度系统的结构特征进行了分析。结果表明:高空冷涡与下滑冷槽、地面气旋造成了前后2次强对流天气。更强的超低温、高低空急流耦合作用、更明显的非均匀结构以及更好的水汽条件,构成过程Ⅱ更强的对流条件。2次过程高低空的温度平流配置与冰雹落区有很好的对应关系。过程Ⅰ对应低层高能区强于过程Ⅱ,过程Ⅱ高层漏斗状θse向下伸展度更大、低层等θse线更密集,导致强天气的发展更加剧烈。飑线初生发展阶段,属低质心系统;飑线成熟阶段,为高质心结构。超级单体和强对流单体均造成了降雹,但结构存在差异。

关键词: 大气能量结构, 飑线, 超级单体