1998年长江流域特大洪涝期水汽输送过程的诊断分析
投稿时间: 2014-02-19  最后修改时间: 2014-02-19  点此下载全文
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作者单位E-mail
江志红 南京信息工程大学气象灾害省部共建教育部重点实验室 zhjiang@nuist.edu.cn 
浦建 南京信息工程大学应用气象学院  
杨浩 南京信息工程大学气象灾害省部共建教育部重点实验室  
基金项目:国家重点基础研究发展计划(973计划)
中文摘要:利用NCEP再分析资料,引入基于拉格朗日方法的气流轨迹模式(HYSPLITv4.9),结合轨迹聚类法和气块追踪法,探讨1998年6月12日-8月27日期间长江流域强降雨的水汽输送轨迹、主要水汽源地及其水汽贡献,发现此次强降水过程的水汽源地主要有3个,分别是印度洋,孟加拉湾-南海,太平洋;不同降水阶段水汽输送轨迹、水汽源地存在差异。降水第一阶段水汽主要来自孟湾-南海,水汽输送贡献为35%。降水第二阶段水汽主要由印度洋、孟湾-南海和太平洋三个区域共同提供,水汽输送贡献分别为32%、28%和31%。降水第三阶段则是来自印度洋和孟湾-南海的水汽输送占主导地位,它们对降水的水汽输送贡献分别为33%和41%。降水第四阶段水汽主要来自孟湾-南海,水汽贡献为40%。强降水过程中大气环流的调整,导致了不同阶段水汽源地的变化及各源地的水汽贡献的差异。
中文关键词:长江流域  水汽输送  水汽源地  拉格朗日轨迹
 
Diagnosis of water vapor transport process in the Yangtze River Basin during 1998 floods
Abstract:Using NCEP reanalysis data and the airflow trajectory model based on lagrangian method (HYSPLIT_4. 9), the variation features of the water vapor transportation and the contribution of vapor on major passage are discussed during the different heavy precipitation stages over the Yangtze River basin from June 12 to August 27 in 1998 which is divided into four stages.The results showed that the water vapor mainly come from three regions, they are Indian Ocean, the Bay of Bengal-South China sea and the Pacific Ocean.During the first and fourth stage, the vapor originate from the Bay of Bengal-South China Sea is most important and accounts for 35% and 40% of the total transportation. During the second stage, the vapor originate from Indian Ocean, the Bay of Bengal-South China sea and the Pacific Ocean are dominant, accounts for 32%、28% and 31% of total moisture transportation,respectively. During the third stage, the water vapor mainly come from Indian Ocean and the Bay of Bengal-South China sea, accounts for 33% and 41% of total moisture transportation,respectively. Adjustment of atmospheric circulation during the heavy rainfall,leading to a change in the contribution of different sources of water vapor.
keywords:the Yangtze River basin  Vapor transportation  Vapor source  Lagrange trajectory
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