| 登陆台风降水的大尺度环流诊断分析 |
| |
| 引用本文： | 程正泉,陈联寿,李英.登陆台风降水的大尺度环流诊断分析[J].气象学报,2009,67(5):840-850. |
| |
| 作者姓名： | 程正泉 陈联寿 李英 |
| |
| 作者单位： | 1. 广州中心气象台,广州,510080;中国气象科学研究院,北京,100081
2. 中国气象科学研究院,北京,100081 |
| |
| 基金项目： | 国家重点基础研究发展规划项目，国家自然基金重点项目，国家灾害天气重点实验室开放课题，热带海洋气象科学研究基金 |
| |
| 摘 要： | 强度相似的登陆台风造成的强降水可能差异很大.为研究大尺度环流对登陆台风降水的影响,利用热带气旋年鉴和NCEP/NCAR再分析资料,运用动态合成分析方法,对比分析了登陆后48小时内降水特征迥异而强度、路径相似的两组登陆台风的大尺度环流特征.合成分析结果表明,西南气流的水汽输送对台风降水至关重要,造成大范围强降水的台风往往在登陆后仍与深厚西南急流相连并持续很长时间.高空强辐散场是登陆台风造成大范围强降水的一个基本动力特征.造成强降水的登陆台风其环境场的上升气流不仅强,其气旋性环流的伸展高度高且能长时间维持.登陆台风造成降水的范围和强度与登陆前台风下游大陆环境大气的稳定度有关.下游高温高湿的大气有利于能量尤其是潜热能的大量补充,对强降水增强和维持都十分有利.因此,大尺度环流对登陆台风降水有明显影响.其中,与台风相连的西南急流强度和深厚程度是最重要的因子,高低空辐散辐合强度、台风及环境风场结构以及台风下游大陆上空大气湿热状态等都是需要加以考虑的.
|
| 关 键 词： | 台风 降水 动态合成 环流特征 对比分析 |
| 收稿时间： | 2008/12/23 0:00:00 |
| 修稿时间： | 2009/6/10 0:00:00 |
Diagnostic analysis of large sca le circulation features associated with strong
and weak landfalling typhoon prec ipitation events. |
| |
| CHENG Zhengquan,CHEN Lianshou and LI Ying.Diagnostic analysis of large sca le circulation features associated with strong
and weak landfalling typhoon prec ipitation events.[J].Acta Meteorologica Sinica,2009,67(5):840-850. |
| |
| Authors: | CHENG Zhengquan CHEN Lianshou and LI Ying |
| |
| Institution: | Guangzhou Central Meteorological Observatory, Guangzhou 510080, China; Chinese Academy of Meteorological Sciences, Beijing 100081, China,Chinese Academy of Meteorological Sciences, Beijing 100081, China and Chinese Academy of Meteorological Sciences, Beijing 100081, China |
| |
| Abstract: | Based on the Tropical Cyclone (TC) Yearbook, the NCEP/NCAR reanalysis data and the dynamic composite analysis, large-scale circulation characteristics are analyzed for two kinds of typhoons, the strong-rainfall typhoon (SRT) and the weak-rainfall typhoon (WRT), which have tracks and TC intensity but distinct rainfall intensity in 48 h after the typhoon landfall. The results show that, transport of water vapor in the southwestern air stream is crucial to typhoon rainfall. A deep southwestern jet is usually as-sociated with a SRT for a long time even after its landfall. Basically, SRTs are characterized by strong divergence at upper levels. They extend into the upper troposphere and the cyclonic circulation and strong up drafts are maintained steadily. The instability of at-mosphere in the downstream region of the typhoon before its landfall can also affect the rainfall area and intensity. Warm and moist atmosphere is favorable for the intensification and maintenance of heavy rain due to the supplement of total energy especially the latent energy. Therefore, large-scale circulations have a significant impact on typhoon rainfall. The large-scale features such as the depth and intensity of the southwestern air stream linking with the typhoon, the intensity of low-level convergence and upper-level diver-gence, the environmental wind structure of the typhoon circulation, and the thermodynamical and humidity condition of the environ-mental atmosphere, should all be taken into consideration in order to correctly forecast typhoon precipitation. |
| |
| Keywords: | Typhoon Rainfall Dynamic composite analysis Circulation characteristics Comparative analysis |
| 本文献已被 万方数据 等数据库收录！ |
| 点击此处可从《气象学报》浏览原始摘要信息 |
| 点击此处可从《气象学报》下载免费的PDF全文 |
|
