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暴雨灾害  2016, Vol. 35 Issue (5): 445-454    DOI:
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相同季节和相似区域华南两次飑线过程比较分析
叶朗明1,伍志方2,张华龙2,郭春迓2
(1. 广东省江门市气象局,江门 529000;2. 广东省气象台,广州 510080)
Comparative analysis on two squall line events in the same season and similar areas of southern China
YE Langming1, WU Zhifang2, ZHANG Hualong2, GUO Chunya2
(1. Jiangmen Meteorological Office of Guangdong Province, Jiangmen 529000;2. Guangdong Meteorological Observatory, Guangzhou 510080)
 全文: PDF (10385 KB)   HTML ( 输出: BibTeX | EndNote (RIS)      背景资料
摘要 利用常规观测资料以及广东省中尺度自动气象站资料、多普勒天气雷达产品、风廓线雷达资料、卫星云图以及NCEP/NCAR 1°×1°再分析资料,对分别发生在2016年4月13日和17日的华南两次飑线过程(前者简称“4.13”飑线,后者简称“4.17”飑线)的特征及其差异进行了分析,重点探讨了相同季节、相似区域不同飑线过程对同一地区所带来的灾情影响差异较大的原因。结果表明: (1) 两次飑线发生的环流背景相似,但后期对广东的影响差异较大, “4.13”飑线影响范围小而强,其进入广东境内发展成弓形回波; “4.17”飑线范围大而相对较弱,其进入广东境内后逐渐减弱。(2) “4.13”飑线过程存在有利于其发生并增强的前倾槽结构和较强垂直风切变; “4.17”飑线过程下游地区有冷空气浸入,不利于强天气发生。(3) 低层暖平流及中层干冷空气下沉造成“4.13”飑线过程强不稳定层结,在广州附近形成气旋性中尺度辐合线有利于飑线在此加强。(4) 两次飑线过程造成地面大风的原因不同, “4.13”飑线大风由弓形顶下击暴流产生,后部入流很强,强回波质心高; “4.17”飑线大风由普通超级单体造成,回波质心较低,雨滴的重力拖曳作用较小,致使地面雷雨大风强度相对较弱。
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关键词飑线   地面辐合线   弓形回波   下击暴流   超级单体     
Abstract: Based on conventional observations, data from regional automatic weather stations (AWSs) over Guangdong, Doppler weather radar data, wind profile radar data, satellite cloud images and NCEP/NCAR reanalysis with 1°×1° resolution, we have conducted a comprehensive analysis for the environmental conditions and the difference between two squall line events occurred in the southern china on 13 and 17 April 2016 (hereinafter referred to as“4.13”event and“4.17”event, respectively), especially discussed the difference in the disaster situation between two squall line events in the same season and similar areas. Results are as follows. (1) Two squall line events, which occur in the similar circulation background, impacted on Guangdong with varying degrees in the later period. The“4.13”event is characterized by a smaller affected area and a greater intensity, and the squall line develops into the bow-shaped echo when it entered Guangdong. While the“4.17”event is characterized by a widely affected area and a weaker intensity, and the squall line gradually weakened when it entered Guangdong. (2) There is a forward-tilling trough structure and a strong vertical wind shear which is propitious to the occurrence and reinforcement of squall line in the“4.13”event. However, cold airs intruding from the downstream areas existed in the“4.13”event, which is not favorable to the occurrence of severe weather. (3) In the“4.13”event, the low-level warm advection and the sinking of middle-level dry and cold airs causeed a strong unstable atmospheric stratification, and then a cyclonic surface mesoscale convergence line was formed near Guangzhou, which is advantageous to the reinforcement of squall line in this region. (4) The cause of resultant surface gale is different between two squall line events. The“4.13”event is originated by downburst under the top of bow-shaped echo, with the very strong rear inflow and the high centroid height of strong echo. On the contrary, the“4.17”event is originated by general super cell in which the intensity of surface thunderstorm gale is relatively weak because of the low echo centroid height and the small gravity drag effect of precipitation particles.
Key wordssquall line   surface convergence line   bow-shaped echo   downburst   super cell   
引用本文:   
.2016. 相同季节和相似区域华南两次飑线过程比较分析[J]. 暴雨灾害, 35(5): 445-454.
.2016. Comparative analysis on two squall line events in the same season and similar areas of southern China[J]. Torrential Rain and Disasters, 35(5): 445-454.
 
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