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“5·7”闽南沿海暖区特大暴雨中尺度特征分析
胡雅君1, 张伟2, 赵玉春1, 陈德花2
(1.海峡气象开放实验室;2.厦门市气象台)
Mesoscale analysis on a warm-sector torrential rain event in southeastern coast of Fujian on 7 May 2018
Hu Yajun1, Zhang Wei2, Zhao Yuchun1, Chen Dehua2
(1.Laboratory of Straits Meteorology;2.Xiamen Meteorological Observatory)
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投稿时间:2019-03-13    修订日期:2019-08-22
中文摘要: 利用双偏振多普勒雷达、风廓线雷达、雨滴谱仪等新型探测资料以及双雷达风场反演资料、地面加密自动观测站资料与FNL再分析资料,分析了2018年5月7日闽南沿海一次暖区特大暴雨过程的中尺度特征。结果表明:此次特大暴雨发生在强盛的超低空西南急流区内;超低空急流具有明显的脉动特征,其突然增强引起低空扰动加强,造成明显的低层辐合;深厚的西南急流导致对流回波形态与回波移动方向高度一致,使得多个强降水对流系统接连经过同一区域,形成列车效应,这是强降水长时间维持的重要原因;强降水对流回波带中,水平方向存在风向风速双重辐合,垂直方向上存在明显的波状运动,上升运动位于强回波前部,使其不断向东北方向移动,同时在强降水对流回波带东南侧存在明显的补偿性次级环流,使低层辐合和上升运动得以维持;高浓度的小雨滴与大雨滴并存是暖区强降水云微物理的重要特征。
Abstract:Based on the data of polarimetric Doppler radar, wind-profiling radar, disdrometer, dual-Doppler radar retrieval, automatic meteorological stations and FNL reanalysis data, we investigated the mesoscale characteristics of warm-section torrential rain in south-eastern coast of Fujian on 7 May 2018. Circulation analysis showed that the torrential rain mainly occurred inside strong ultra-low-level southwest jet. Wind profile analysis showed that the pulsation feature of ultra-low-level jet was obvious. Sudden enhancement of the jet favored the low-level disturbance, which caused significant low level convergence. Deep southwest jet led to high consistency of convective echo pattern and echo moving direction, causing multiple strong convective systems pass the same area repeatedly (a train effect), which was an important reason for heavy rainfall to last such a long time. Dual-Doppler radar retrieval wind indicated that, there existed both wind speed and direction convergence inside strong echo in horizontal direction. In vertical direction, there existed significant wave-like motion in the echo band with the ascending motion in the front of the strong echo. This could guide echo to move north-eastward. There was significant compensatory secondary circulation in southeast of the strong echo, which maintained low-level convergence as well as the upstream. Polarization parameter and DSD analysis indicated that a high concentration of small raindrops with a few large raindrops is the main cloud microphysical characteristics of warm-section torrential rain.
文章编号:201903130102     中图分类号:    文献标志码:
基金项目:国家自然科学基金(41675047,41675018,41705045),中国气象局预报员专项CMAYBY2019-054,福建省“强降水机理与预报技术研究”创新团队,厦门市气象局“海洋气象精细化预报”创新团队和海峡气象开放实验室开放课题Hxkf016共同资助
引用文本:
胡雅君,张伟,赵玉春,陈德花,0.[en_title][J].Meteor Mon,():-.
Hu Yajun,Zhang Wei,Zhao Yuchun,Chen Dehua,0.Mesoscale analysis on a warm-sector torrential rain event in southeastern coast of Fujian on 7 May 2018[J].Meteor Mon,():-.