| 冬半年南支槽的气候特征分析 |
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| 引用本文： | 张永莉,范广洲,周定文,谢清霞,朱丽华,王炳赟.冬半年南支槽的气候特征分析[J].成都信息工程学院学报,2012,27(2):196-201. |
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| 作者姓名： | 张永莉 范广洲 周定文 谢清霞 朱丽华 王炳赟 |
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| 作者单位： | 1. 成都信息工程学院大气科学学院 高原大气与环境四川省重点实验室,四川 成都,610225
2. 成都信息工程学院大气科学学院 高原大气与环境四川省重点实验室,四川 成都 610225;贵州省气象局,贵州贵阳550002 |
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| 基金项目： | 国家科技支撑计划资助项目，行业专项资助项目 |
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| 摘 要： | 为了解冬半年南支槽的气候特征,定义了一个冬半年南支槽的强度指数,南支槽强度指数值越大,表示该年南支槽比较弱,反之亦然。采用经验正交函数分解(EOF)、小波分析、Mann-Kendal检验等方法,研究了南支槽的年际、年代际变化异常以及时空特征。分析结果表明,随着南支槽强度指数的整体上升,其强度总体呈现减弱的趋势。南支槽在20世纪50～70年代明显偏强,此现象持续到1976年,之后开始逐渐减弱,至今一直处于偏弱状态。对南支槽强度指数做EOF分解,仅第一模态的方差贡献就达80.29%,故南支槽的变化特征大多数年呈第一模态的分布特征,相应的时间权重系数存在明显的年际和年代际变化,且具有长期正趋势,表明南支槽减弱的趋势越来越显著。
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| 关 键 词： | 气候学 气候特征 强度指数 气候突变 |
The Climate Characteristics Analysis of the Wintertime Southern Branch Trough |
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| ZHANG Yong-li
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FAN Guang-zhou
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ZHOU Ding-wen
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XIE Qing-xia
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ZHU Li-hua
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WANG Bin-yun.The Climate Characteristics Analysis of the Wintertime Southern Branch Trough[J].Journal of Chengdu University of Information Technology,2012,27(2):196-201. |
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| Authors: | ZHANG Yong-li FAN Guang-zhou ZHOU Ding-wen XIE Qing-xia ZHU Li-hua WANG Bin-yun |
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| Institution: | ZHANG Yong-li,FAN Guang-zhou,ZHOU Ding-wen,XIE Qing-xia,ZHU Li-hua,WANG Bin-yun(1.Plateau Atmosphere and Environment Key Laboratory of Sichuan Province,CUIT,Chengdu 610225,China;2.Guizhou Meteorological Bureau Dept,Guiyang 550002,China) |
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| Abstract: | The purpose of this paper is to realize the climate characteristics of the wintertime southern branch trough,and define a southern branch trough intensity index.The southern branch trough intensity index of greater value,said that the southern branch trough is relatively weaker,and vice versa.By using the Empirical Orthogonal Function(EOF),wavelet analysis,Mann-Kendal test to study the southern branch trough inter-annual,decadal variation anomalies and spatial and temporal characteristics.The results of analysis showed that,with an overall increase of the south branch trough intensity index,the strength of overall weakening trend.The strong side of south branch trough in the 50 to 70 years of the 20th century,clearly,this phenomenon continued until 1976,then gradually weakened and has been in a weak state.EOF of south branch trough intensity index,the first mode variance contribution amounts to 80.29%,so most of the variation of the south branch trough was in first modal distribution,the appropriate time weighting coefficient significantly inter-annual and decadal changes with long-term positive trend,and the south branch trough weakening trend becomes obviously. |
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| Keywords: | climatology climate characteristics intensity index climate abrupt |
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