| 一次台风大暴雨成因及落区分析 |
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| 引用本文： | 张京英,赵海军,王庆华,胡燕,李秉文,于艳敏.一次台风大暴雨成因及落区分析[J].气象科技,2010,38(Z1):35-41. |
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| 作者姓名： | 张京英 赵海军 王庆华 胡燕 李秉文 于艳敏 |
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| 作者单位： | 山东省临沂气象局，临沂 276004;山东省临沂气象局，临沂 276004;山东省临沂气象局，临沂 276004;山东省临沂气象局，临沂 276004;山东省临沂气象局，临沂 276004;山东省临沂气象局，临沂 276004 |
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| 基金项目： | 山东省气象局重点科研课题(2008 sdqxz 20)和临沂市科技发展计划项目(080203063)资助 |
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| 摘 要： | 对2007年9月19日到20日一次台风暴雨过程进行了数值模拟,利用模式输出资料具体分析了本次台风登陆减弱后的低压结构特征和大暴雨落区。结果表明:流场上高空辐散低空辐合特征明显,台风右侧来自海洋的低空潮湿偏南气流向中纬度槽前和台风倒槽前部输送的大量水汽在鲁东南东部和山东半岛南部辐合,形成强降水区;台风中心风速较小,和东部海上强风速中心形成明显"风速偶",降水区主要发生在中、低层"风速偶"之间的强风速梯度中。由于下垫面分为海上和陆上两部分,台风低压物理量场结构存在东西不对称性质,上升运动更加强烈,降水强度更大。降水的增幅与高空东南急流及高空正涡度中心和负散度中心的明显脉动下传有关系。
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| 关 键 词： | 台风低压 大暴雨 结构特征 风速偶 |
| 收稿时间： | 2010/7/12 0:00:00 |
| 修稿时间： | 2010/10/12 0:00:00 |
Causal and Area Analysis of a Typhoon Heavy Rain |
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| Zhang Jingying,Zhao Haijun,Wang Qinghu,Hu Yan,Li Bingwen and Yu Yanmin.Causal and Area Analysis of a Typhoon Heavy Rain[J].Meteorological Science and Technology,2010,38(Z1):35-41. |
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| Authors: | Zhang Jingying Zhao Haijun Wang Qinghu Hu Yan Li Bingwen and Yu Yanmin |
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| Institution: | Linyi Meteorological Bureau, Shandong Province, Linyi 276004;Linyi Meteorological Bureau, Shandong Province, Linyi 276004;Linyi Meteorological Bureau, Shandong Province, Linyi 276004;Linyi Meteorological Bureau, Shandong Province, Linyi 276004;Linyi Meteorological Bureau, Shandong Province, Linyi 276004;Linyi Meteorological Bureau, Shandong Province, Linyi 276004 |
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| Abstract: | With the meso scale model MM5, the rainstorm process of Typhoon Wipha on 19 and 20 September is simulated successfully. Based on the MICAPS data and mesoscale numerical simulation products, the low pressure structure characteristics and heavy rain area of Typhoon Wipha are analyzed. It is found that there existed divergence at high altitudes and convergence at low altitudes. The heavy rainfall was produced by the convergence of abundant vapor in the southeastern Shandong and to the south of the Shandong peninsula, which was induced by the moist southerly stream from the sea at the right side of the typhoon. The wind speed of typhoon center was relatively smaller than that of the strong wind center on the sea, and the wind speed mates are formed between the two centers. The heavy rain mainly happened in the areas with large wind speed gradient between the wind speed mates in the mid low layer. Because of the land sea difference of the underlying surface, the physical structure of the typhoon under low pressure was east west asymmetric, and moreover, the up movements over land and sea areas had different characters. The up movement of the sea areas was stronger and more unstable than that on the land. The heavy rainfall occurred in the eastern part of the inverted typhoon trough. The increment of precipitation was related to the remarkable pulsation downward movement of the high altitude southeast jet, high altitude positive vortex center, and negative divergence center. |
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| Keywords: | typhoon low pressure heavy rain structural feature wind speed mate |
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