文章摘要
两类典型极端降水过程气象因子异常特征对比
Yi= Ai /B*100%
投稿时间:2021-06-07  修订日期:2021-08-27
DOI:
中文关键词: 极端降水  气象因子异常度  天气概念模型
英文关键词: extreme  precipitation, abnormal  degree of  meteorological factors, weather  conceptual model
基金项目:
作者单位邮编
张萍萍 威海市气象局 264200
  
董良鹏 武汉中心气象台 
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中文摘要:
   利用NCEP/NCAR再分析资料和其他常规观测资料,对湖北省两类典型极端降水型(南北气流汇合型、南北槽叠加型)天气背景及气象因子异常特征进行分析,结果表明:南北气流汇合型500hPa上形成南北气流汇合形势,低层切变线南侧南风发展异常强盛,地面上冷锋入暖槽形成静止锋,动力因子(850hPa涡度、200hPa散度)和水汽因子(大气可降水量)异常特征显著;南北槽叠加型500hPa上形成南北槽叠加形式,低层或边界层形成显著低涡,地面上暖低压强烈发展,动力因子(200hPa散度、925hPa涡度)和不稳定因子(700hPa温度平流)异常度比例偏高。最后给出了两类集天气背景与气象因子异常度配置于一体的极端降水天气概念模型。
英文摘要:
   Based on NCEP / NCAR reanalysis data and other conventional observation data, the abnormal characteristics of weather background and meteorological factors of two typical extreme precipitation types (north-south flow convergence type and North-South trough superposition type) in Hubei Province are analyzed. The results show that:the north and south flow of the north-south flow convergence type converge at 500hPa. The south wind on the south side of the low-level shear line is extremely strong, and the cold front on the ground enters the warm trough to form a stationary front. The anomalous characteristics of dynamic factors (850hPa vorticity, 200hPa divergence) and water vapor factors (Atmospheric Precipitable Water) are significant; The north and south trough of the north-south trough superposition type superpose on 500hPa .The low layer or boundary layer forms a significant vortex, and the warm and low pressure on the ground develops strongly, and the ratio of the abnormal degree of dynamic factor (200hPa divergence, 925hPa vorticity) and instability factor (700hPa temperature advection) is high. Finally, two kinds of extreme precipitation weather conceptual models are given, which are integrated with weather background and meteorological factor anomaly degree.
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