高级搜索
王春玲, 张一平, 崔力, 唐影, 王聪, 刘晓燕. 2022: 豫东北一次春季大暴雨的环境条件与中尺度特征分析. 暴雨灾害, 41(1): 76-85. DOI: 10.3969/j.issn.1004-9045.2022.01.009
引用本文: 王春玲, 张一平, 崔力, 唐影, 王聪, 刘晓燕. 2022: 豫东北一次春季大暴雨的环境条件与中尺度特征分析. 暴雨灾害, 41(1): 76-85. DOI: 10.3969/j.issn.1004-9045.2022.01.009
shu
WANG Chunling, ZHANG Yiping, CUI Li, TANG Ying, WANG Cong, LIU Xiaoyan. 2022: Analysis of environmental condition and mesoscale characteristics for a heavy rainstorm event in Spring in northeast Henan. Torrential Rain and Disasters, 41(1): 76-85. DOI: 10.3969/j.issn.1004-9045.2022.01.009
Citation: WANG Chunling, ZHANG Yiping, CUI Li, TANG Ying, WANG Cong, LIU Xiaoyan. 2022: Analysis of environmental condition and mesoscale characteristics for a heavy rainstorm event in Spring in northeast Henan. Torrential Rain and Disasters, 41(1): 76-85. DOI: 10.3969/j.issn.1004-9045.2022.01.009
shu

豫东北一次春季大暴雨的环境条件与中尺度特征分析

Analysis of environmental condition and mesoscale characteristics for a heavy rainstorm event in Spring in northeast Henan

    摘要
  • 摘要: 利用常规观测资料以及卫星云图、雷达产品、区域自动站降水量资料与NCEP/NCAR 1°×1°再分析资料，对2018年5月15日豫东北罕见大暴雨过程的降水特征、环境条件与中尺度特征进行了分析。结果表明: (1) 副热带高压西侧西南急流输送、对流层中层短波槽影响、低空急流加强发展及北上、高空强辐散等天气系统合理配置，是这次暴雨过程发生的有利环流背景；强低空急流为暴雨的形成提供了充沛的水汽和位势不稳定条件；低层切变线触发、弱冷空气扩散及地面中尺度辐合线抬升是暴雨形成的动力机制。(2) 超低空充足的水汽输送及强辐合、对流不稳定能量偏高、大气层结极不稳定是此次暴雨发生的主要环境特征。(3) 强降水过程主要由2个β中尺度对流系统造成，暴雨区上空对流云团新生维持(或移入)是强降水维持较长时间的重要原因。(4) 雷达观测显示，在极强对流不稳定环境下，位于对流云团前温度大梯度区的豫北多地不断有γ中尺度回波单体生成，其东移加强并在豫东北强烈发展为线(带)状多单体风暴，形成明显的局地强回波“列车效应”，导致豫东北局地大暴雨。

     

    Abstract: Using conventional observations, satellite images, radar data, precipitation data from regional automatic weather stations and the NCEP/NCAR reanalysis with 1°×1° resolution, we have conducted analysis on the precipitation characteristics, environmental conditions and mesoscale features of a rare heavy rainstorm event in northeast Henan on 15 May 2018. The results indicate that (1) the event occurred due to the transport of moisture by large scale southwest jet in west part of the subtropical high, the effect of short-wave trough in the middle troposphere, the strengthening and extending northward of the low-level jet and strong divergence in the upper levels. Such environmental conditions are favorable to the occurrence of heavy rainstorm. The powerful low-level jet provides the abundant water vapor and the potential instability for the formation of heavy rainstorm. The triggering of low-level shear line, the diffusion of weak cold air and the lifting of surface mesoscale convergence line are the dynamic mechanism for this heavy rainstorm event. (2) The occurrence of this heavy rainstorm event is mainly characterized in the environment field by sufficient transport and strong convergence of water vapor in the ultra-low level, abnormally high convective unstable energy and extremely unstable atmospheric stratification. (3) The heavy precipitation of this event is mainly caused by the two β-mesoscale convection systems, while the newborn and continuance or the migration of convective cloud clusters over the rainstorm area is an important reason for the long-term maintenance of severe precipitation. (4) Radar observations show that the γ-mesoscale echo cells are continuously generated in the large temperature gradient area in front of the convective cloud clusters in Northern Henan under the extremely strong convective instability, which strengthens when moving eastward and develop strongly to form line-or belt-type convective multi-cell storms over Northeast Henan. The local heavy rainstorm in northeast Henan is due to the direct effect of the"train effect" formed by the obvious local strong echoes

     

    • HTML全文
    • 参考文献(19)
    • 相关文章
    • 施引文献
  • 资源附件(0)

/

返回文章
返回