J4 ›› 2007, Vol. 25 ›› Issue (1): 48-52.
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WANG Zhenguo1,ZHUO Hong2, LI Chunhu 3,LIU Aimei 2,YANG Furong2
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王振国1,卓鸿2,李春虎3,刘爱梅2,杨芙蓉2
作者简介:
基金资助:
山东省气象局重点科研项目(2005sdqxzl7)资助
Abstract:
A spring gust front occurred on April 17,2003 over Ji’nan was analyzed by using Doppler radar data.A typical density curleat outt]ow boundary(gust front)characteristic was retrieved,which presented a strong nalTow bow echo belt before a wide weak echo region on Doppler radar echo images.Diferent elevation velocity fields showed a reasonable spatial structure of the gust front.The characteristic of the gust front on Doppler Radar echo images presented the length was long(short)at low(high)elevation and the distance was far(near)at low(high)elevation.A typical midaltitude radial convergence(MARC)at the height of2.5—7 km on velocity vertical profileindicated an evident rear middle—levelinflow.A phenomenonthatthegustfrontwas near the groundwas foundwith radar elevation increase.
Key words: spring gust front, Doppler radar, spatial structure, MARC
摘要:
通过对济南地区一次春季阵风锋的多普勒雷达资料分析,反演出典型的密度流外流边界(阵风锋)的特征,在雷达回波图上表现为一条狭窄的弧状强回波带,强回波带的后方再发展出宽大较弱的回波区。体扫的各仰角速度场显示出阵风锋合理的空间结构;雷达回波上阵风锋的长度表现为低仰角长,高仰角短,而距离表现为低仰角远,高仰角近。速度垂直剖面上存在典型的中层径向辐合MARC,高度大约在2.5—7 km之间,反映出强对流存在明显的后方中层人流。随着仰角的增大,可以分析出阵风锋是近地面现象。
关键词: 春季阵风锋, 多普勒雷达, 空间结构, 中层径向辐合MARC
CLC Number:
TN958
WANG Zhen-Guo, ZHUO Hong, LI Chun-Hu, LIU Ai-Mei, YANG Fu-Rong. Analysis of a Gust Front 3——D Structure by Using Doppler Radar Data[J]. J4, 2007, 25(1): 48-52.
王振国, 卓鸿, 李春虎, 刘爱梅, 杨芙蓉. 多普勒雷达对一次阵风锋的三维结构研究[J]. J4, 2007, 25(1): 48-52.
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