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气象:2017,43(11):1354-1363
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福建春季西南急流暖湿强迫背景下的强对流天气流型配置及环境条件分析
冯晋勤1,俞小鼎2,蔡菁1,赖巧珍1
(1 福建省龙岩市气象局,龙岩 364000 2 中国气象局干部培训学院,北京 100081)
Flow Pattern and Ambient Condition Analysis of Spring Southwest Low Level Jet Warm Sector Severe Convection in Fujian
FENG Jinqin1,YU Xiaoding2,CAI Jing1,LAI Qiaozhen1
(1 Longyan Meteorological Office of Fujian, Longyan 364000 2 China Meteorological Administration Training Centre, Beijing 100081)
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投稿时间:2016-03-10    修订日期:2017-08-14
中文摘要: 根据2002—2013年福建26次春季强对流天气过程中12例由西南急流暖湿强迫产生的强对流天气的高低空环流配置,利用常规高空、地面观测资料以及NCEP再分析资料,运用中尺度对流天气的天气图分析技术建立福建春季西南风低空急流暖湿强迫背景下的强对流天气流型的识别方法,并统计静力稳定度、水汽、抬升和垂直风切变条件及相应物理量要素,初步揭示了福建省春季西南急流暖湿强迫背景下的强对流天气过程的特征和规律。此类强对流天气是由对流层中、高层干冷空气位于低层强烈发展的暖湿平流之上形成显著条件不稳定层结,逆温、干暖盖、中低层有利的水汽条件,上干下湿的温湿廓线以及低空辐合、高空辐散为强对流天气的发生提供了有利的环境条件,强对流天气系统由地面的锋面、辐合线、热低压、925 hPa辐合线以及西南急流脉动等中尺度天气系统触发,对流生成后在西南风急流引导下移入有利于对流发展的不稳定区域使得对流持续发展,强垂直风切变配合较大的对流有效位能有利于对流风暴持续发展。
Abstract:Utilizing conventional meteorological data, the NECP reanalysis data, spring southwest jet warm sector severe convection flow pattern of Fujian is established by using mesoscale convective weather analysis technique. From the perspectives of the four basic conditions for the development of severe convection, namely the instability, moisture, lifting and wind vertical shear, the characteristics of spring southwest jet warm sector severe convection flow pattern of Fujian are revealed. Southwest jet warm sector severe convection flow pattern is characterized by low level strong warm and moist advection over middle and high level troposphere’s dry and cold air. The inversion, warm dry lid, mid low level sufficient water vapor, upper dry and low moist vertical profile, low level convergence and high level divergence are all favorable to the development of severe convection. The severe convective weather is often triggered by the front of surface, the convergence line of surface or 925 hPa, hot low pressure of surface, pulsation of southwest jet. The severe convective weather sustainably develops when the convection moves to the favorable envir onment by the guidance of southwest jet. Strong vertical wind shear with high CAPE is favorable for the sustainable development of convective storm.
文章编号:     中图分类号:P458    文献标志码:
基金项目:中国气象局预报员专项(CMAYBY2014 034)、中国气象局关键技术集成项目(CMAGJ2015M30)和中国气象局2017年预报关键技术业务发展专项[YBGJXM(2017)02]共同资助
引用文本:
冯晋勤,俞小鼎,蔡菁,赖巧珍,2017.福建春季西南急流暖湿强迫背景下的强对流天气流型配置及环境条件分析[J].气象,43(11):1354-1363.
FENG Jinqin,YU Xiaoding,CAI Jing,LAI Qiaozhen,2017.Flow Pattern and Ambient Condition Analysis of Spring Southwest Low Level Jet Warm Sector Severe Convection in Fujian[J].Meteor Mon,43(11):1354-1363.