| 梅雨期高层流场对低层急流及中尺度系统影响的数值试验 |
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| 引用本文： | 翟国庆,高坤,孙淑清.梅雨期高层流场对低层急流及中尺度系统影响的数值试验[J].气象学报,1997,55(6):714-725. |
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| 作者姓名： | 翟国庆 高坤 孙淑清 |
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| 作者单位： | 杭州大学地理系，中国科学院大气物理所 |
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| 基金项目： | 国家自然科学基金,浙江省自然科学基金 |
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| 摘 要： | 用中尺度模式对一次江淮流域暴雨过程进行了数值试验，并研究了对流层高层青藏高压东侧偏北大风的强弱与低层流场及中尺度系统发生及至降水过程的影响。试验不仅较成功地模拟了本次暴雨过程及相应的系统，而且揭示出较强的高空偏北大风将引起对低空急流的加强。而更为重要的是低层切变线的出现以及其上中尺度涡旋的发生。上下风场所构成的垂直反环流圈大大有利于对流的发展，特别是在切变线地区的上升支，带有明显的中尺度特征。
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| 关 键 词： | 梅雨锋暴雨，高低层流场耦合，数值试验 |
| 收稿时间： | 7/1/1996 12:00:00 AM |
| 修稿时间： | 1996/11/18 0:00:00 |
A NUMERICAL STUDY ON THE INFLUENCE OF WIND FIELDS AT UPPER LEVELS IN THE MEI YU PERIOD ON THE DEVELOPMENT OF LOW LEVEL JET AND MESOSCALE SYSTEMS |
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| Zhai Guoqing,Gao Kun and Sun Shuqing.A NUMERICAL STUDY ON THE INFLUENCE OF WIND FIELDS AT UPPER LEVELS IN THE MEI YU PERIOD ON THE DEVELOPMENT OF LOW LEVEL JET AND MESOSCALE SYSTEMS[J].Acta Meteorologica Sinica,1997,55(6):714-725. |
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| Authors: | Zhai Guoqing Gao Kun and Sun Shuqing |
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| Institution: | Department of Geography, Hangzhou University, Hangzhou, 310028;Department of Geography, Hangzhou University, Hangzhou, 310028;Institute of Atmospheric Physics, Academia Sinica, Beijing, 100080 |
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| Abstract: | Using a mesoscale model a numerical study on a heavy rainfall case occurring in the Yangtze Huaihe River Valley is made in this paper. The influence of the intensity of northeasterly wind in front of the Tibetan High at upper level on the low level wind field and development of mesoscale systems as well as heavy rainfall is investigated. The model well reproduced the heavy rainfall process and the weather systems associated. And it indicates that the strong northeasterly flow around the High at upper troposphere will bring about not only the strengthening of low level southeasterly wind, but also the appearance of shear line and mesoscale vortex at low level. The coupling of northerly wind at upper level and southerly wind at lower level constructs an indirect vertical circulation which is most favourable for the development of convective motions. Its ascending branch in the shear line area is very strong and shows a pronounced mesoscale characteristic. |
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| Keywords: | Heavy rainfall on mei yu front Coupling of high and low level winds Numerical experiments |
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