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四川盆地一次中反气旋超级单体的雷达回波特征研究
罗辉1, 苟阿宁2, 康岚1, 郭云云1
(1.四川省气象台;2.武汉中心气象台)
Radar echo characteristics for anti-mesocyclone of a supercell in August 2016 Sichuan
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投稿时间:2019-11-12    修订日期:2020-06-05
中文摘要: 本文利用成都多普勒天气雷达、风廓线雷达、以及加密自动站资料,详细分析了超级单体的形成演变,以及中反气旋的形成原因,主要有以下几点结论:(1)中反气旋超级单体形成于高空冷涡西部的偏北气流下,中高层伴有强的冷平流,对流不稳定能量达到5029.7J/kg,500至850hPa温差达到29℃,500hPa至925hPa风切变矢量差约为16m/s,探空整体呈现上干冷下暖湿的喇叭口形状,低层逆温的存在利于能量的累积。(2)地面偏西风在龙泉山脉的强迫抬升下触发雷暴,雷暴中下沉气流产生冷出流,在北侧不断触发新单体,雷暴与新生单体合并发展为超级单体。中反气旋超级单体风暴伴随低层强辐合、中反气旋、后侧入流、后侧入流缺口、涡旋偶等回波特征。(3)S1超级单体风暴内中反气旋的形成由低层和中层2个部分合并形成。对于低层中反气旋,雷暴单体合并时产生小涡旋,干冷空气侵入与暖湿上升气流造成斜压涡度,使辐合产生旋转,在强辐合作用下雷暴强烈发展,强的上升运动使垂直涡度拉伸,旋转增强。(4)中层中反气旋,3-4km高度范围内水平风矢量差大约为12m/s,对应水平涡度约为1.2×10-2/s,利于水平涡管的形成,在强的上升气流与下沉气流作用下产生涡旋偶,中高层风随高度逆时针旋转利于反气旋的发展。
Abstract:The evolution and formation were discussed by supercell in Chengdu on 7 August 2016. Based on Doppler weather radar of Chengdu,wind profiler radar,and encrypted automatic station observation,the evolution features of middle anticyclone are studied in this paper. The result shows: (1) The middle anticyclone supercell were formed under the northerly airflow in the west of the upper cold vortex. Strong cold advection were accompanied in middle and upper layers.The convective instability energy(CAPE) reached 5029.7J/kg, the temperature difference between 500 and 850hPa was 29℃, and the wind shear vector difference between 500hPa and 925hPa was about 16 m/s. A bell-mouth shape of Chengdu sounding is beneficial to accumulation of energy. (2) Thunderstorms were triggered by westward winds under the forced uplift of Longquan Mountains. The cold outflows were produced by downdrafts, and new monomers are triggered on the north side continuously. Thunderstorms and new monomers merged into super-monomers. The echo characteristics of low-level strong convergence, medium-anti-cyclonic, back-side inflow, back-side inflow gap, and vortex couple appeared in the anti-mesocyclone supercell storms. (3) The anticyclones in supercell storm(S1) was formed by merging the lower and middle layers. For the anticyclone in the lower layer,small eddies are generated when thunderstorm cell merging.the baroclinic vorticity were caused by intrusion of dry cold air and warm wet updraft , which caused
文章编号:201911120398     中图分类号:    文献标志码:
基金项目:中国气象局预报员专项(CMAYBY2019-097),四川省气象局强对流预报创新团队,省重实验室2018-青年-01
引用文本:
罗辉,苟阿宁,康岚,郭云云,0.[en_title][J].Meteor Mon,():-.
luohui,Gouaning,kanglan,guoyunyun,0.Radar echo characteristics for anti-mesocyclone of a supercell in August 2016 Sichuan[J].Meteor Mon,():-.