| 一个涡旋与变形场的相互作用指数 |
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| 引用本文： | 姜勇强,王元,周祖刚,吕梅,罗坚.一个涡旋与变形场的相互作用指数[J].解放军理工大学学报,2011,0(6):685-689. |
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| 作者姓名： | 姜勇强 王元 周祖刚 吕梅 罗坚 |
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| 作者单位： | 1. 南京大学 中尺度灾害性天气教育部重点实验室，江苏 南京 210093； 2. 解放军理工大学 气象学院，江苏 南京 211101；3. 南京大学 大气科学学院，江苏 南京 210093 |
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| 基金项目： | 国家973计划资助项目( 2009CB421502)；国家自然科学基金资助项目(40921160382，40830958，40905021). |
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| 摘 要： | 为了分析涡旋在变形场中的短期强度、移动路径和速度的变化,提出了一个涡旋与变形场的相互作用指数VDI(interaction index of vortex and deformation field),采用基于Lanczos窗口函数的数字滤波合成分析方法,分析了2001年8月5、6日造成上海特大暴雨的热带低压(TD)过...
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| 关 键 词： | 涡旋 热带低压 变形场 变形系数 |
| 收稿时间： | 2010-06-30 |
| 修稿时间： | 2010-06-30． |
Interaction index of vortex and deformation field |
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| JIANG Yong-qiang,WANG Yuan,ZHOU Zu-gang,LV Mei and LUO Jian.Interaction index of vortex and deformation field[J].Journal of PLA University of Science and Technology(Natural Science Edition),2011,0(6):685-689. |
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| Authors: | JIANG Yong-qiang WANG Yuan ZHOU Zu-gang LV Mei and LUO Jian |
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| Institution: | 1. Key Laboratory of Mesoscale Severe Weather/Ministry of Education of China, Nanjing University, Nanjing 210093, China; 2. Institute of Meteorology, PLA Univ. of Sci. &; Tech., Nanjing 211101, China； 3. School of Atmospheric Sciences, Nanjing University, Nanjing 210093, China |
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| Abstract: | To analyze the short term change of the intensity and the moving track and speed of the vortex in the deformation field, an interaction index of vortex and deformation field (VDI) was presented. The background pattern of a heavy rainfall event caused by a tropical depression (TD) during 5 6 August 2001 was analyzed with a digital filter compositing method based on Lanczos window function. It is shown that a col field forms as the strong Western Pacific subtropical high is splitting over eastern China. The TD intensifies as it is moving into the col field. Because the higher VDI which is favor of the development of TD represents the stronger interaction of the TD and the col field, the TD may move toward the high VDI region, so the VDI center can be taken as an indication of the moving direction of the TD. Furthermore, the distance between the TD center and the VDI center is also an indication of the moving speed of the TD. The bigger the size of distance, the quicker the TD moves. |
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| Keywords: | vortex TD (tropical depression) deformation field deformation coefficient |
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