摘要
【目的】利用常规观测资料、探空资料和NCEP/NCAR 1°×1°的逐6 h再分析资料,对2018年8月20—21日宁夏区域性暴雨产生的环流背景和物理量因子进行分析,为当地暴雨预报提供参考。【方法】通过环流分析和物理量诊断方法,对此次暴雨产生的环流背景、影响因子、水汽、热力、动力条件等物理量因子进行分析。【结果】结果表明:此次降水过程是在欧亚“两槽两脊”形势背景下,配合中低层低涡、切变线产生的。700 hPa水汽输送是主要水汽条件。700 hPa以下,36°~39°N为强辐合区,强辐合区上空对应辐散区,且辐合中心略向北倾斜,有利于上下抽吸,增强上升运动。水平方向上辐合区、辐散区成对紧邻出现,有利于增强水平辐合辐散,以及上升运动的维持。西北-东南向高能舌的持续存在,为强对流天气提供了充足不稳定能量。【结论】有利的环流背景,700 hPa充足的水汽,配合一定的动力、热力条件造成了此次暴雨天气的生成、发展。
[Purposes]By using the routine observation data,sounding data and NCEP/NCAR 1°×1°re-analysis data every 6 hours,the circulation background and physical factors of the regional rainstorm in Ningxia on August 20—21,2018 were analyzed to provide reference for local rainstorm forecast.[Meth-ods]Based on the circulation analysis and physical quantity diagnosis method,the circulation back-ground,influence factors,water vapor,thermal and dynamic factors of the heavy rainfall were analyzed.[Findings]The results showed that the precipitation process was produced under the background of"two grooves and two ridges"in Eurasia,in conjunction with the Low Vortex and shear line.700 hPa water va-por transportation was the main water vapor condition.36°~39°N Under 700 hPa was the strong conver-gence region,and the convergence center was inclined to the north,which was favorable for upward and downward suction and enhanced upward motion.In the horizontal direction,the convergence region and divergence region appeared in pairs,which was beneficial to the enhancement of horizontal convergence and divergence and the maintenance of ascending motion.The persistent existence of northwest-southeast high energy tongue provided sufficient unstable energy for strong convective weather.[Conclu-sions]The favorable circulation background,700 hPa sufficient water vapor,combined with certain dy-namic and thermal conditions caused the formation and development of the heavy rain weather.
作者
杨苑
陈星宜
张泽瑾
高山
YANG Yuan;CHEN Xingyi;ZHANG Zejin;GAO Shan(Key Laboratory for Meteorological Disaster Monitoring and Early Warning and Risk Management of Charac-teristic Agriculture in Arid Regions,CMA,Yinchuan 750000,China;Key Laboratory of Meteorological Disas-ter Prevention and Reduction of Ningxia,Yinchuan 750000,China;Zhongwei Meteorological Bureau,Zhong-wei 755000,China)
出处
《河南科技》
2024年第14期99-103,共5页
Henan Science and Technology
关键词
宁夏暴雨
环流背景
物理量
Ningxia rainstorm
circulation background
physical quantity
