| 台风远距离影响下的大暴雨对流涡度矢量分析 |
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| 引用本文： | 高维英,李明,侯建忠.台风远距离影响下的大暴雨对流涡度矢量分析[J].气象科技,2012,40(5):814-819. |
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| 作者姓名： | 高维英 李明 侯建忠 |
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| 作者单位： | 1. 西安市气象台,西安,710016
2. 陕西省气象台,西安,710015 |
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| 基金项目： | 2011年中国气象局预报员专项“陕西区域性大暴雨典型个例预报技术总结”（CMAYB2011-050）、陕西省气象局2010年基金项目“远距离台风影响下的陕西大暴雨机理分析研究”（2010M-5）资助 |
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| 摘 要： | 利用常规观测资料、NCEP再分析资料、自动站资料和卫星云图资料,对2010年7月16-19日台风远距离影响下的川陕大暴雨天气过程从对流涡度矢量进行诊断分析.结果表明:高θε区位于西南涡偏南侧暖湿气流端,大暴雨区即位于此处；大暴雨中心等θε线随高度近于垂直分布,θε高值区呈“漏斗”状结构,从低层到对流层顶均为90％的相对湿度.东北—西南向的倾斜高空急流加强了急流入口区右侧的高层辐散,造成大暴雨区强而深厚的垂直上升运动.强降水中心低层为东南风,中层为西南风,高层为西北风,对流不稳定性很大；西风分量u在中层垂直切变较大,南风分量v在中高层垂直切变较大.大暴雨出现在对流涡度矢量(CVV)垂直分量和气柱云水量二者大值重合区.
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| 关 键 词： | 大暴雨 西南涡 对流涡度矢量(CVV) 气柱云水量 |
| 收稿时间： | 2011/5/12 0:00:00 |
| 修稿时间： | 2011/8/25 0:00:00 |
Convective Vorticity Vector Analysis of a Heavy Rainstorm under Long Distance Influence of Typhoon |
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| Gao Weiying,Li Ming and Hou Jianzhong.Convective Vorticity Vector Analysis of a Heavy Rainstorm under Long Distance Influence of Typhoon[J].Meteorological Science and Technology,2012,40(5):814-819. |
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| Authors: | Gao Weiying Li Ming and Hou Jianzhong |
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| Institution: | 1. Xi＇an Meteorological Observatory, Xi＇an 710016; 2. Shaanxi Meteorological Observatory, Xi＇an 710015) |
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| Abstract: | An analysis is made of a heavy rainstorm under the long-distance influence of the Typhoon from 16 to 19 July 2010 from convective vorticity vector （CVV） on the basis of conventional observation data, NCEP reanalysis data, automatic station data, and satellite cloud data. The results show that the high θ. value area located in the warm-wet airflow on the south side of southwest vortex; the θ. contours over the heavy rainstorm center were nearly vertical, which presented a funnel-shaped structure, and there was a deep moist column of 90% relative humidity from low levels to the tropopause; the northeast southwest upper jet strengthened the high level divergence on the right side of the jet entrance region, which caused deep and strong vertical ascending motion over the heavy rainstorm area;there existed southeast winds at low levels, southwest winds at middle levels and northwest winds at high levels; there was great convective instability over the heavy rainstorm and obvious latitudinal wind shear at middle levels and meridional wind shear at mid-upper levels over the heavy rainstorm centers. The heavy rainstorm appeared in the coincidence area of the large CVV and atmospheric column cloud water. |
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| Keywords: | heavy rainstorm southwest vortex convective vorticity vector column cloud water |
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