| 基于EMD方法的我国年气温和东部年降水量序列的振荡模态分析 |
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| 引用本文： | 刘莉红,郑祖光,琚建华.基于EMD方法的我国年气温和东部年降水量序列的振荡模态分析[J].高原气象,2008,27(5). |
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| 作者姓名： | 刘莉红 郑祖光 琚建华 |
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| 作者单位： | 中国气象局培训中心,北京,100081 |
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| 基金项目： | 国家自然科学基金项目，国家科技支撑计划课题 |
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| 摘 要： | 基于经验模态分解(EMD)方法,探讨了近百年来全国年平均气温序列以及东部地区年降水量序列的振荡模态结构特征。结果表明:全国年气温序列的振荡变化主要由第1,2,4本征模态分量构成,3~5年、8~10年的振荡以及百年内的升—降—升的年代际变化对整个气温变化起主要作用,近几年处于暖期。东部年降水量序列的振荡变化主要由第1,2本征模态分量构成,3~5年的振荡起主要作用,百年中有3个高值期,近几年处于多雨期。气温和降水原序列都没有明显的周期性,但其内在振荡分量却有某些周期性。
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| 关 键 词： | 经验模态分解 本征模态函数 振荡变化 |
Vacillations of the Time Series of Annual Temperature and Precipitation in China Based on EMD Method |
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| LIU Li-hong,ZHENG Zu-guang,JU Jian-hua.Vacillations of the Time Series of Annual Temperature and Precipitation in China Based on EMD Method[J].Plateau Meteorology,2008,27(5). |
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| Authors: | LIU Li-hong ZHENG Zu-guang JU Jian-hua |
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| Abstract: | Based on empirical mode decomposition(EMD) method,we have discussed the national annual temperature as well as the vacillation mode structure characteristics of annual precipitation time series in eastern China in recent 100 years.The results show that vacillation with 3~5 and 8~10 years as well as the vacillation which composed of 1st,2nd,4th intrinsic mode function are important role for the national annual temperature time series.During one hundred years,it has experienced the interdecadal change which show rise to fall to rise,in recent years it is in the warm phase.In eastern China,annual precipitation time series is mainly composed of 1st and 2nd intrinsic mode function,and vacillation with 3~5 years plays an important role.There are 3 high values in recent 100 years,and it is in the multi-rain phase in recent years.The time series of original temperature and precipitation data do not have the obvious periodicity,but its intrinsic mode function time series have certain periodicities. |
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| Keywords: | Empirical mode decomposition Intrinsic mode function Vacillation change |
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