[1]张容菁,李秀昌,彭武坚,等.玉林市“4·19”飑线大风成因及雷达特征分析[J].气象研究与应用,2023,44(03):90-94.[doi:10.19849/j.cnki.CN45-1356/P.2023.3.16]
　ZHANG Rongjing,LI Xiuchang,PENG Wujian,et al.Analysis of the causes of gale and radar characteristics of “4·19”squall line in Yulin[J].Journal of Meteorological Research and Application,2023,44(03):90-94.[doi:10.19849/j.cnki.CN45-1356/P.2023.3.16]
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玉林市“4·19”飑线大风成因及雷达特征分析()
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气象研究与应用[ISSN:1673-8411/CN:45-1356/P]

卷:
第44卷
期数:
2023年03期
页码:
90-94
栏目:
出版日期:
2023-09-15

文章信息/Info

Title:
Analysis of the causes of gale and radar characteristics of “4·19”squall line in Yulin
作者:
张容菁;  李秀昌;  彭武坚;  林确略;  陆秋霖
玉林市气象局, 广西 玉林 537000
Author(s):
ZHANG Rongjing;  LI Xiuchang;  PENG Wujian;  LIN Quelue;  LU Qiulin
Yulin Meteorological Bureau, Guangxi Yulin 537000, China
关键词:
暖区飑线; 大风; 环境条件; 双偏振雷达回波
Keywords:
warm sector squall line; strong winds; environmental conditions; dual-polarization radar echoes
分类号:
P458.1+23
DOI:
10.19849/j.cnki.CN45-1356/P.2023.3.16
摘要:
利用自动气象站加密和常规观测资料、欧洲中期天气预报中心全球气候第五代大气再分析数据(ERA5)以及SA波段双偏振雷达资料,对2023年4月19日玉林暖区飑线过程进行分析。结果表明:(1)本次飑线过程发生在高空短波槽、低空切变线和地面倒槽锋面影响的环流背景下,是一次湿对流型飑线。(2)中层短波槽的动力作用与低层高温高湿环境配合较好,倒槽中的锋面是触发强对流天气的关键系统,飑线成熟阶段,受中高层短波扰动影响,飑线脱离锋面向暖区快速移动发展。(3)此次暖区飑线过程具有飑中系统的典型特征,飑线后部形成一个冷池,冷池密度流形成强的雷暴出流,造成冷池前部玉林多处出现10级以上大风。(4)雷达回波具有弓状回波、速度模糊、后侧入流缺口等雷暴大风特征,双偏振参量显示ZDR大值区随高度降低,回波均一性较好(CC>0.9),ZDR和KDP都可以看到飑线前沿的极大值窄回波带。
Abstract:
Based on data from automatic weather stations, conventional observations, ERA5 reanalysis data, and dual-polarization radar data, the squall line event in the Yulin warm sector that occurred on April 19, 2023 was analyzed. The results show that:(1)The squall line event occurred under the influence of the upper-level shortwave trough, low-level shear line, and surface inverted trough front, indicating it is a moist convective squall line.(2)The dynamic effect of the mid-level shortwave trough, in conjunction with the warm and moist environment in the lower levels, played a significant role. The front within the inverted trough was the key system triggering severe convective weather. During the mature stage of the squall line, influenced by the mid-to upper-level shortwave disturbance, the squall line detached from the front and rapidly developed towards the warm sector.(3)This warm sector squall line event exhibited typical characteristics of a squall system. A cold pool formed behind the squall line, and the density currents associated with the cold pool generated strong thunderstorm outflows. As a result, Yulin experienced gale above magnitude 10 on the Beaufort scale in multiple locations ahead of the cold pool. (4)The radar echoes exhibited characteristics of severe thunderstorm gale, such as bow echoes, velocity aliasing, and rear inflow notches. The dual-polarization parameters showed a decrease in the ZDR(differential reflectivity) maximum values with height, indicating a narrowing echo band with good echo uniformity(CC>0.9). Both ZDR and KDP(specific differential phase) showed the presence of a narrow band of maximum values along the leading edge of the squall line.

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备注/Memo

备注/Memo:
收稿日期:2023-5-3。
基金项目:广西气象青年人才培养项目(桂气科 2023QN13)、广西气象科技计划指令性项目(桂气科2023ZL11)
作者简介:张容菁(1996-),女,助理工程师,主要从事短期天气预报及环境气象研究工作。E-mail:zorina_rjzhang@foxmail.com
更新日期/Last Update: 1900-01-01