| 多普勒雷达对一次阵风锋的三维结构研究 |
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| 引用本文： | 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].甘肃气象,2007,25(1):48-52,87. |
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| 作者姓名： | 王振国 卓鸿 李春虎 刘爱梅 杨芙蓉 |
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| 作者单位： | [1]甘肃省甘南州气象局,甘肃合作747000 [2]济南市气象局,山东济南250001 [3]山东省气象局．山东济南250001,山东济南250001 |
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| 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;在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入流.随着仰角的增大,可以分析出阵风锋是近地面现象.
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| 关 键 词： | 春季阵风锋 多普勒雷达 空间结构 中层径向辐合MARC |
| 文章编号： | 1006-7639（2007）-01-0048-05 |
| 修稿时间： | 2006-05-082006-12-17 |
Analysis of a Gust Front 3 - D Structure by Using Doppler Radar Data |
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| WANG Zhenguo,ZHUO Hong,LI Chunhu,LIU Aimei,YANG Furong.Analysis of a Gust Front 3 - D Structure by Using Doppler Radar Data[J].Gansu Meteorology,2007,25(1):48-52,87. |
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| Authors: | WANG Zhenguo ZHUO Hong LI Chunhu LIU Aimei YANG Furong |
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| Abstract: | A spring gust front occurred on April 17,2003 over Ji'nan was analyzed by using Doppler radar data.A typical density current outflow boundary(gust front) characteristic was retrieved,which presented a strong narrow bow echo belt before a wide weak echo region on Doppler radar echo images. Different 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 of 2.5-7 km on velocity vertical profile indicated an evident rear middle-level inflow.A phenomenon that the gust front was near the ground was found with radar elevation increase. |
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| Keywords: | spring gust front Doppler radar spatial structure MARC |
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