沈杭锋,方桃妮,蓝俊倩,翟国庆,苏涛. 2019. 一次强飑线过程极端大风的中尺度分析[J]. 气象学报, (0):-, doi:10.11676/qxxb2019.052
一次强飑线过程极端大风的中尺度分析
Meso-Scale Analysis of Extreme damaging gale during a Severe Squall line
投稿时间:2018-08-22  修订日期:2018-12-24
DOI:10.11676/qxxb2019.052
中文关键词:  极端大风,飑线,冷池,动量下传,地形
英文关键词:Extreme damaging gale, Squall line, Cold pool, Downward transportation of momentum, Terrain
基金项目:浙江省科技厅重点项目(2017C03035),浙江省气象局科技项目(2018YB13)
作者单位E-mail
沈杭锋 杭州市气象局 orangeboy@zju.edu.cn 
方桃妮 金华市气象局 363588728@qq.com 
蓝俊倩 衢州市气象局 672705066@qq.com 
翟国庆 浙江大学地球科学学院 zhaigq@zju.edu.cn 
苏涛 浙江省气象科学研究所 zjusutao@qq.com 
摘要点击次数: 187
全文下载次数: 161
中文摘要:
      利用常规气象观测资料、区域自动站加密观测资料和GFS 0.25°×0.25°逐6h的分析场数据以及多普勒雷达、风廓线等资料,通过背景形势场分析、物理量诊断分析和中尺度分析,对2018年3月4日发生在华东地区的强飑线天气过程进行了诊断分析,结果表明:这次过程具有发生时间(季节)早、移速快、范围广、致灾强等特点,是一次比较少见的早春(冬末)十分强烈的飑线天气过程,是在高空急流辐散区、低空西南急流轴前端、低涡南侧的暖区之中发展起来的。飑线过程的地面要素变化十分剧烈,地面有强冷池,与飑线前暖空气之间构成了强的水平温度梯度,致使飑线强度更强;飑线经过时气压涌升所形成的雷暴高压、强气压梯度以及飑线的快速移动均有利于地面极端大风的出现。飑线发展过程中形成了弓形回波、超级单体等强天气系统,中高层动量下传和光滑湖面、喇叭口、狭管效应等特殊地形对于大风的增强效应比较显著,这些因素也加剧了地面极端大风的形成。
英文摘要:
      A severe squall line event was studied by the conventional observation data, automatic weather station data, GFS analysis field data with special resolution of 0.25° and temporal resolution of 6h, Doppler radar and radar wind profiler in Eastern China on 4 March 2018. The results demonstrated that it was a rare severe squall line with features of untimely occurrence, fast moving, wide range and catastrophic damages during early spring (late winter). It grew and evolved in divergence area of upper air jet, in front of low level southwest jet axis and in the warm area of a low level vortex. The meteorological elements varied fiercely during this process. The large horizontal temperature gradient which formed by the surface cold pool and warm air ahead of the squall line enhanced the intensity of the system. The severe thunderstorm high, strong pressure gradient and fast moving of the strong squall line resulted in the extreme damaging gale. Furthermore, the extreme damaging gale would be intensified by the bow echo, supercell, downward transportation of momentum and special terrain (such as smooth lake, trumpet terrain and narrow tube effect).
查看全文   查看/发表评论  下载PDF阅读器
分享按钮