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| 低涡与急流对"04.9"川东暴雨影响的分析与数值模拟 | |
| 引用本文： | 何光碧,陈静,李川,冯汉中.低涡与急流对"04.9"川东暴雨影响的分析与数值模拟[J].高原气象,2005,24(6):1012-1023. |
| 作者姓名： | 何光碧 陈静 李川 冯汉中 |
| 作者单位： | 1. 云南大学,大气科学系,云南,昆明,650091;中国气象局,成都高原气象研究所,四川,成都,610072 2. 中国气象局,成都高原气象研究所,四川,成都,610072 3. 云南大学,大气科学系,云南,昆明,650091;四川省气象台,四川,成都,610072 |
| 基金项目： | 中国气象局成都高原气象研究所高原基金;国家自然科学基金项目（40275017）;四川省气象局“数值集合预报技术研究”和“城市服务体系建设”;中国气象局新技术推广项目共同资助 |
| 摘 要： | 2004年9月3日～5日川东出现了大范围的强暴雨过程，本文分析了这次暴雨过程的云图特征和环流形势，并利用MM5中尺度数值模式对本次暴雨进行了二重嵌套模拟，分析及模拟结果表明，本次降水过程与中尺度云团、高低空急流和对流层中低层涡旋活动密切相关，同时还与副热带高压活动和“桑达”台风活动相关。盆地涡出现在低空急流的左侧，而川东强降水发生在高空急流的南面、低涡东南侧与西南低空急流大风出口区之问。盆地正涡度维持有利于盆地上空垂直上升运动的发展和维持，对暴雨的发生提供了动力条件。垂直上升运动是高低空急流和盆地涡联系的纽带，也是盆地涡动力驱动的结果。分析结果还表明，西南低空急流在暴雨出现前建立，暴雨和盆地涡同时出现，而暴雨、低空急流和盆地涡几乎同时减弱。高空急流在过程前和过程中是逐步加大，当高空急流出现剧减时，预示暴雨即将结束。 |
| 关 键 词： | 低涡 急流 暴雨 数值模拟 云图特征 环流形势 |
| 文章编号： | 1000-0534（2005）06-1012-12 |
| 收稿时间： | 2005-04-06 |
| 修稿时间： | 2005-04-062005-07-12 |
Analysis and Numerical Simulation for Effects of Vortex and Jet Stream on Heavy Rain in East Sichuan in September 2004 |
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| HE Guang-bi,CHEN Jing,LI Chuan,FENG Han-zhong.Analysis and Numerical Simulation for Effects of Vortex and Jet Stream on Heavy Rain in East Sichuan in September 2004[J].Plateau Meteorology,2005,24(6):1012-1023. | |
| Authors: | HE Guang-bi CHEN Jing LI Chuan FENG Han-zhong |
| Institution: | 1. Department of Atmosphere Sciences, Yunnan University, Kunrning 650091, China; 2. Chengdu Institute of Plateau Meteorology China Meteological Administration, Chengdu 610072, China; 3. Sichuan Meteorological Observatory, Chengdu 610072, China |
| Abstract: | We have analyzed the effects of vortex in the basin and jet stream on heavy rain in the east of Sichuan province in September 2004,and have done numerical simulation.The results show the process of precipitation is related to mesoscale cloud mass,jet stream and vortex activities in mid- and lower- levels,at the same time,and along with to activities of subtropicalhigh pressure and !SHANG DA"typhoon.The vortex in Sichuan basin appeared in the left of lower- jet stream,and the heavy rain in the east of Sichuan occurredin the south of upper level jet stream,there exits strong south-east lower jet stream to south-east of low vortex.Maintaining of positivevortex in the basin is benefitto the development and lasting of the vertical ascending movement over the basin,and provided dynamic condition for heavy rain.Vertical ascending movement was the ligament linking jet stream and basin vortex as well as dynamic driving result in the basin.Thesouth-west jet stream had built before the heavy rain appeared,and heavy rain and basin vortex appeared almost at the same time,as well as the heavy rain,low jet stream and basin vortex weaken together.The high jet stream was progressively increasingbefore and during the process of the precipitation.When the upper leveljet stream weakened,heavyrain was ending. |
| Keywords: | Vortex Jet stream Heavy rain Numerical simulation |
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