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暴雨灾害  2019, Vol. 38 Issue (2): 135-143    DOI: 10.3969/j.issn.1004-9045.2019.02.005
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一次罕见强飑线10级大风的雷达回波特征分析
张弛, 支树林, 许爱华
江西省气象台, 南昌 330096
Analysis of radar echo characteristics of rare force 10 gale with a strong squall line event in Jiangxi
ZHANG Chi, ZHI Shulin, XU Aihua
Jiangxi Meteorological Observatory, Nanchang 330096
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摘要 利用宜春、南昌、景德镇等地多普勒天气雷达资料以及常规观测与加密自动站等资料,分析2018年3月4日江西罕见强飑线过程及其伴随的区域性10级以上雷暴大风的成因与雷达回波特征。结果表明:(1)该过程飑线系统发生在槽前暖区,低层强西南暖湿平流、中层干冷空气、强中低空垂直风切变维持为飑线系统提供了有利的环境条件。(2)飑线后侧入流急流的动量下传和干空气卷入风暴的蒸发作用共同导致强烈下沉气流造成快速移动的冷池并引起地面大风。(3)区域性10级雷暴大风的雷达回波特征突出:弓形回波尺度大(200~450 km)、中心强度强(55~60 dBz)、移速快(100~120 km·h-1);低层径向速度异常大并出现速度模糊;边界层内大风速核前侧径向辐合强,低层最大径向速度切变大;强回波中心、径向风大风速核和径向辐合带均存在前倾特征。(4)低仰角径向速度图上31 m·s-1以上大风速核和30 m·s-1·(10km)-1以上径向速度切变,反射率因子图上移速大于100 km·h-1的弓形回波,以及风廓线(VWP)图上20 m·s-1大风速核高度下降,都可作为10级大风临近预警的参考指标。
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张弛
支树林
许爱华
关键词飑线   10级大风   大风速核   径向辐合     
Abstract: Using the products from Doppler weather radars at Yichun, Nanchang, Jingdezhen and other places, as well as conventional observations and observational data from regional automatic weather stations, we have conducted an analysis of the cause and radar echo characteristics of the rare regional force 10 gale during a strong squall line event in Jiangxi on 4 March 2018. Results are as follows. (1) The squall lines in this event occur in the warm zone in front of a trough, and strong southwest warm and wet airflow in the low-level, dry and cold air in the middle level, and the maintenance of strong vertical wind shear between middle and low-level provide the favorable environmental conditions for the stability and continuance of squall lines. (2) The downward transport of momentum by the inflow jet on the rear side of the squall lines and the evaporation of the dry air wrapping up storm result in the strong descending airflow, then lead to the cold pool moving rapidly and cause surface gale. (3) The radar echo of regional force 10 thunderstorm gale is characterized by bow-shaped echo being 200-450 km in scale, 55-60 dBz in centre intensity and 100-120 km·h-1 in moving speed. Its low-level radial velocity is much large and appears aliasing. The radial convergence at front side of high wind core is strong. The maximum radial velocity shear value at the lower level is large, and strong echo centre, high radial velocity core and radial convergence zone all have a forward tilting feature. (4) High velocity cores above 31 m·s-1 and radial velocity shears above 30 m·s-1·(10 km)-1 in the radial velocities of low elevation angles, bow-shaped echoes with moving speed more than 100 km·h-1 in the reflectivity factor chart, and the descending of high velocity cores of 20 m·s-1 in the VWP production can be used as the reference indicators for early warning of the force 10 gale.
Key wordssquall line   force 10 gale   high wind core   radial convergence   
收稿日期: 2018-08-17;
基金资助:

气象预报业务关键技术发展专项(YBGJXM(2018)02-12);江西省预报员专项(17302005151765)

通讯作者: 支树林,主要从事短时临近天气预报业务。E-mail:zhisl00@126.com   
作者简介: 张弛,主要从事短时天气预报工作。E-mail:sunnyzhangchi@163.com
引用本文:   
张弛, 支树林, 许爱华 .2019. 一次罕见强飑线10级大风的雷达回波特征分析[J]. 暴雨灾害, 38(2): 135-143.
ZHANG Chi, ZHI Shu-Lin, XU Ai-Hua .2019. Analysis of radar echo characteristics of rare force 10 gale with a strong squall line event in Jiangxi[J]. Torrential Rain and Disasters, 38(2): 135-143.
 
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