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一次大雪天气过程的多普勒雷达特征分析
引用本文:东高红,张志茹,李胜山,贾惠珍.一次大雪天气过程的多普勒雷达特征分析[J].气象,2007,33(7):75-81.
作者姓名:东高红  张志茹  李胜山  贾惠珍
作者单位:1. 天津市气象台,300074
2. 天津市武清区气象局
摘    要:利用常规天气资料、新一代多普勒天气雷达资料和改善的EVAD技术,从影响系统、多普勒雷达回波特征及大气动力学角度,详细分析了2006年2月6日出现在华北地区的大雪天气过程。结果表明:500hPa高空槽、850hPa“人”字型切变及地面气旋相配置是这次大雪天气过程的主要影响系统。在雷达有效探测范围内,随着0.7~1.1km高度上中尺度逆切变的出现和4.8km高度上西南急流的建立并向低层扩展,风场辐合明显加强,辐合层加厚,从而为强降雪的出现和维持提供了有利条件,且中尺度逆切变和西南急流存在的时间与强降雪出现及维持的时间有很好的对应。另外冷锋过境时风场辐合再次加强使得较强降雪继续维持。同时用改善的E-VAD技术计算了降雪不同阶段的大气平均散度和平均垂直速度。结果表明:中尺度逆切变系统和冷锋的出现均对应着明显的辐合和上升,辐合和上升又促使强降雪出现和维持,因而从大气动力学角度进一步证实了中尺度逆切变和冷锋的存在及其与强降雪的对应关系。

关 键 词:大雪  多普勒雷达资料  中尺度逆切变  EVAD技术
收稿时间:2006/12/1 0:00:00
修稿时间:2006-12-012007

The Doppler Weather Radar Analysis of a Heavy Snow Event
Dong Gaohong,Zhang Zhiru,Li Shengshan and Jia Huizhen.The Doppler Weather Radar Analysis of a Heavy Snow Event[J].Meteorological Monthly,2007,33(7):75-81.
Authors:Dong Gaohong  Zhang Zhiru  Li Shengshan and Jia Huizhen
Institution:1. Tianjin Meteorological Observatory, 300074; 2. Wuqing Meteorological Office, Tianjin City
Abstract:Based on the conventional and single-Doppler radar data, the heavy snow event occurred in the North China on 6th February 2006 has been analyzed. The results show that the major influencing system of this heavy snowfall is the well-matched configuration of the trough at 500hPa, the herringbone shear at 850h-Pa and the cyclone at surface. The Doppler radar data analyses show that the appearance of the meso-scale inverse shear at 0.7-1.1 km, as well as the establishment and downward stretch of the southwestern jet at 4.8km accelerated the wind convergence and thickening of the convergence layer, which provide favorable condition to the heavy snowfall. The timings of the meso-scale inverse shear and the southwestern jet correspond well to that of the appearance and maintenance of the heavy snowfall. The cold front also affects the maintenance of the snowfall. We applied the improved EVAD technique to dynamically analyze the changes of the average divergence and vertical velocity at different snowfall periods. The results indicate that the appearances of the meso-scale inverse shear and the cold front correspond to the intense convergence and upward motion, which cause the occurrence and maintenance of the snowfall. These further confirm the existences of the meso-scale inverse shear and clod front, as well as their correspondence to the heavy snowfall.
Keywords:heavy snowfall Doppler radar data meso-scale inverse shear EVAD technique
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