夏季大西洋Nino与我国夏季降水异常的联系
投稿时间: 2017-12-29  最后修改时间: 2018-04-02  点此下载全文
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作者单位E-mail
李忠贤 南京信息工程大学 lizhongxian@nuist.edu.cn 
余滔 南京信息工程大学  
曾刚 南京信息工程大学  
邓伟涛 南京信息工程大学  
基金项目:国家重点基础研究发展计划(973计划);国家自然科学基金项目(面上项目,重点项目,重大项目)
中文摘要:本文利用NCEP-DOE AMIP-Ⅱ的再分析资料,Hadley中心的海表温度资料以及全国160站降水量资料,运用经验正交函数(Empirical Orthogonal Function,EOF)分解和回归分析等方法研究了夏季大西洋Nino的变化特征及其与我国夏季降水异常的联系,结果表明:夏季大西洋Nino是热带大西洋海温异常EOF第一模态,方差贡献率为33.7%,具有明显的年际变化特征。当夏季大西洋Nino处于暖位相时,对流层下层西北太平洋地区出现明显的异常反气旋,受其影响,西太平洋副热带高压强度增强、位置西伸,我国华南地区出现显著的西南风异常,有利于西太平洋副热带高压西南侧的水汽向我国长江流域及其以北地区输送,使我国长江流域和华北地区降水增多,而我国东南沿海地区则受西北太平洋异常反气旋的控制,不利于降水的发生;反之亦然。
中文关键词:大西洋Nino,EOF分解,中国夏季降水,西北太平洋反气旋,西太平洋副热带高压
 
Summer Atlantic Nino and its association with China summer rainfall anomalies
Abstract:The variation of summer Atlantic Nino and its association with China summer rainfall were investigated based on National Centers for Environmental Prediction-Department of Energy (NCEP-DOE) Atmospheric Model Intercomparison Project Phase-II (AMIP-II) reanalysis data, Hadley SST and the observed rainfall data of 160 stations in China for the period of 1979~2014 by using empirical orthogonal function (EOF) analysis and regression analysis method. The results suggest that the summer Atlantic Nino is the first mode of EOF in tropical Atlantic SSTA, which revealed 33.7% variance, with apparent inter-annual variation. When the Atlantic Nino is warm in summer, the appearance of an anomalous anticyclone over western North Pacific in the lower troposphere intensifies the Western Pacific subtropical high and makes it shift westward. The associated southwest flux in South China from the southwest side of Western Pacific subtropical high is responsible for the positive rainfall anomalies in the Yangtze river basin and northern China. Meanwhile, the western North Pacific anomalous anticyclone covers the southeastern periphery of China so that the rainfall there becomes less; and vice versa.
keywords:Atlantic Nino, EOF, China summer rainfall, western North Pacific anomalous anticyclone, Western Pacific subtropical high
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