太平洋海温场两种不同时间尺度气候模态的分析

吕俊梅; 琚建华; 张庆云; 曹杰

太平洋海温场两种不同时间尺度气候模态的分析

1.
中国科学院, 大气物理研究所, 北京 100029;云南大学, 大气科学系, 云南昆明 650091;云南大学, 大气科学系, 云南昆明 650091
2.
中国气象局培训中心, 北京 100081
3.
中国科学院, 大气物理研究所, 北京 100029
4.
云南大学, 大气科学系, 云南昆明 650091

基金项目: 国家自然科学基金面上项目(40365001);中国科学院资源环境领域知识创新工程重要方向项目(ZKCX2-SW-210);国家自然科学基金重点项目(40233033);云南大学校内科研项目(2002Q014ZH).

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出版历程
- 收稿日期: 2004-11-25
- 修回日期: 2005-07-28

The analysis of two climate patterns on different time scales in Pacific sea temperature fields

1.
Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China;Department of Atmospheric Sciences, Yunnan University, Kunming 650091, China;Graduate School of Chinese Academy of Sciences, Beijing 100039, China
2.
China Meteorological Administration Training Centre, Beijing 100081, China
3.
Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China
4.
Department of Atmospheric Sciences, Yunnan University, Kunming 650091, China

摘要

摘要: 利用经验正交函数分解、多元线性回归分析、小波分析和离散功率谱等方法,对太平洋年代际振荡(PDO)和ENSO的关系进行研究,发现太平洋海温场中主要存在着PDO和ENSO两种气候模态.用线性回归分析方法对这两种模态进行分离,结果表明,去除ENSO信息后,太平洋海温变化的关键区出现于北太平洋中纬度地区,PDO的信号很明显;而去除PDO信息后,海温变化的关键区位于赤道中、东太平洋地区,ENSO的信号较明显,此时ENSO循环不具有年代际振荡的特征,表明PDO对ENSO的调制作用是ENSO事件具有年代际变化特征的重要原因.
- 太平洋年代际振荡(PDO) /
- ENSO循环 /
- 气候模态 /
- 分离
Abstract: Some techniques,such as,empirical orthogonal function analysis,multivariate linear regression,wavelet analysis and discrete power spectral method,are used to study the relations between Pacific Decadal Oscillation(PDO) and ENSO.It is found that PDO and ENSO are two dominant climatic patterns existing in Pacific SST fields.Regression analysis is applied to separate these two kind of climatic patterns.The results show that the key area of SST variability locates in mid-latitude North Pacific Ocean and the signals of PDO are obvious after the signature of ENSO is removed from Pacific SST fields,whereas the key area locates in central and eastern equatorial Pacific Ocean and the signals of ENSO are evident after the signature of PDO is removed.Under the latter circum stance the ENSO cycle no long appears the charact eristics of interdecadal variations.This suggests that the modulating action of PDO plays an important role in the cause of inter decadal variations of ENSO cycle.
- Pacific Decadal Oscil lation /
- ENSO cycle /
- climate pattern /
- separation

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