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中文摘要: 用奇异谱分析(Singularspectrumanalysis,以下简称SSA)研究了136年(1856-1991年)全球平均海温季距平演变特征,并对各主分量作了最大熵谱分析。结果表明,海温演变除了具有81年周期外,还有一些非常明显的周期振动,这些周期主要是准10年利2.6-6年。从各主分量的方差贡献来看,前15个主分量的方差贡献之和是总方差的78%。从特征向量的分布函数来看,第1、2特征向量表示了海温序列的线性特征,它们的方差之和可以占到总方差的48%,其合成曲线基本上可以描述海温百年尺度内数年或数十年
中文关键词: 海温,奇异谱分析,主分量
Abstract:The global SSTA for past 136years(1856-1991)was studied with singular spectrum analysis,then a maximum entropy spectrum analysis for serveral principal components was conducted.The result shows that SSTA has serveral very evident periods of quasidecade and 26-6 years besides 81 years.The first fifteen principal components have a variance contribution of 78%.Eigenvector 1,2 stand for linear characteristic of SSAT,their variance contribution is 48%,and their resultant curve basically described average thenes during serveral years and serveral decades.Eigenvector 3 and afterwards eigenvectors stand for wave characteristics of SSTA.The first four principal components can better fit SSTA yearly change characters.
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引用文本:
林志强,1997.全球平均海温演变的奇异谱分析[J].气象,23(9):31-34.
,1997.The Singular Spectrum Analysis for Global SSTA[J].Meteor Mon,23(9):31-34.
林志强,1997.全球平均海温演变的奇异谱分析[J].气象,23(9):31-34.
,1997.The Singular Spectrum Analysis for Global SSTA[J].Meteor Mon,23(9):31-34.