| 5.6阵风锋过程形成机制探讨 |
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| 引用本文： | 黄旋旋,何彩芬,徐迪峰,汪永胜.5.6阵风锋过程形成机制探讨[J].气象,2008,34(7):20-26. |
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| 作者姓名： | 黄旋旋 何彩芬 徐迪峰 汪永胜 |
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| 作者单位： | 1. 浙江省宁波市气象局,315012
2. 浙江省东阳市气象局 |
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| 基金项目： | 宁波市应急联动系统科技专项 |
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| 摘 要： | 通过综合分析2007年5月6日一次阵风锋过程的天气背景、多普勒天气雷达资料、自动站资料等,并结合2006年6月10日飑线过程,2007年6月28日窄带回波引发的大风过程,认为与大风相联系的窄带回波的产生,是由于冷暖气团交界面两侧的折射指数的突变,而导致对电磁波的散射或反射形成雷达回波.高空冷空气堆的下沉扩散是窄带回波形成的一个重要因子,其后并不一定有主体回波相伴随.而倾斜的下沉气流前侧不利于窄带回波的形成.
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| 关 键 词： | 阵风锋 窄带回波 形成机制 |
| 收稿时间： | 2008/3/10 0:00:00 |
| 修稿时间： | 4/7/2008 12:00:00 AM |
Discussion on the Generation Mechanism of "5.6" Gust Front |
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| Huang Xuanxuan,He Caifen,Xu Difeng and Wang Yongsheng.Discussion on the Generation Mechanism of "5.6" Gust Front[J].Meteorological Monthly,2008,34(7):20-26. |
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| Authors: | Huang Xuanxuan He Caifen Xu Difeng and Wang Yongsheng |
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| Institution: | Ningbo Meteorological Office, Zhejiang Province 315012;Ningbo Meteorological Office, Zhejiang Province 315012;Ningbo Meteorological Office, Zhejiang Province 315012;Nongyang Meteorological Office |
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| Abstract: | Comprehensive data, including weather pattern, Doppler radar, AWS on a gust fron
t occurred on May 6,2007 were analyzed and compared with the squall line on June
10,2006 and a gale process on June 28,2007. Results show that generation mechan
ism of a narrow band echo accompanying gale wind is of abrupt refractive index
changes along the interface between warm and cold air masses, which lead to elec
tromagnetic wave scattering and reflecting, and in turn forms weak echo. Another
important factor is the sinking and diffusing motion of cold air in upper level
. Behind the narrow band echo, there probably is no main echo following. The fr
ont of inclining downdraft is unfavorable to the narrow band echo. |
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| Keywords: | gust front narrow band echo formation mechanism |
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