| 一次连续暴雨的非地转湿Q矢量分解分析 |
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| 引用本文： | 刘运成.一次连续暴雨的非地转湿Q矢量分解分析[J].气象科技,2011,39(6):796-802. |
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| 作者姓名： | 刘运成 |
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| 作者单位： | 四川省广元市气象局,广元,628017 |
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| 摘 要： | 利用实测暴雨资料，运用改进的非地转湿Q矢量对青藏高原东侧2005年7月18日至19日的一次连续暴雨天气进行了诊断分析。分析结果表明：700 hPa Q矢量散度场不仅将暴雨区反映出来了，而且散度辐合中心与降水中心对应。进一步把改进的非地转湿Q矢量分解为平行于等位温线和垂直于等位温线两部分，分析表明：准地转的大尺度系统与非地转非绝热的中小尺度系统在不同高度起着不同程度的作用，二者相叠加，形成暴雨。在第一阶段的暴雨中，大尺度的上升运动强迫作用在700 hPa占主要作用，而中小尺度系统在较低层次和中层起主要作用，促使强对流的发展和深对流的形成，对暴雨落区的反映也更准确。在第二阶段的暴雨中，垂直上升运动以中尺度非绝热强迫为主，随着对流不稳定能量的大量释放，中小尺度系统作用快速减弱，降水趋于减弱。
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| 关 键 词： | 连续暴雨 改进的非地转湿Q矢量 分解 |
| 收稿时间： | 2010/6/27 0:00:00 |
| 修稿时间： | 2010/12/14 0:00:00 |
Application of Improved Wet Q Vector Partitioning Method to Diagnosis of a Continued Heavy Rain |
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| Liu Yuncheng.Application of Improved Wet Q Vector Partitioning Method to Diagnosis of a Continued Heavy Rain[J].Meteorological Science and Technology,2011,39(6):796-802. |
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| Authors: | Liu Yuncheng |
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| Institution: | Liu Yuncheng (Guangyuan Meteorological Service, Sichuan, Guangyuan 628017) |
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| Abstract: | By means of the conventional observation data and the improved wet Q vector （Q^q）, a continued torrential rain process on the east side of the Qingzang Plateau between 18 and 19 July 2005 is diagnosed. The convergence field of Q^q on 700 hPa indicated the region of the heavy rain, and the convergence center corresponded to the precipitation center. By dividing the improved ageostrophic wet Q vector into two parts： parallel and perpendicular to isentropes, further research is made on the event. The results show that the large scale and mesoscale systems had different forcing of vertical motion on different layers. The superposition of two ascending motions produced the heavy rain. During the first phase of the continual heavy rain, the large scale ascending motion on 700 hPa was primary, while the mesoscale ascending motion was dominant in the lower and middle layers, and they caused the strong convection to develop and deep convection to form,which can reflect the area of the heavy rain more precisely. During the second phase of the heavy rain, the mesoscale ascending motion forcing was dominant. With the weakening of the heavy rain, the proportion of the large scale ascending motion increased, and the mesoscale decreased. |
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| Keywords: | continual heavy rain improved ageostrophic wet Q vector vector decomposition |
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