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Advances in Atmospheric Sciences

, Volume 20, Issue 2, pp 173–184 | Cite as

On the decadal and interdecadal variability in the Pacific Ocean

  • Yang Haijun
  • Zhang Qiong
Article

Abstract

The Pacific decadal and interdecadal oscillation (PDO) has been extensively explored in recent decades because of its profound impact on global climate systems. It is a long-lived ENSO-like pattern of Pacific climate variability with a period of 10–30 years. The general picture is that the anomalously warm (cool) SSTs in the central North Pacific are always accompanied by the anomalously cool (warm) SSTs along the west coast of America and in the central east tropical Pacific with comparable amplitude. In general, there are two classes of opinions on the origin of this low-frequency climate variability, one thinking that it results from deterministically coupled modes of the Pacific ocean-atmosphere system, and the other, from stochastic atmospheric forcing. The deterministic origin emphasizes that the internal physical processes in an air-sea system can provide a positive feedback mechanism to amplify an initial perturbation, and a negative feedback mechanism to reverse the phase of oscillation. The dynamic evolution of ocean circulation determines the timescale of the oscillation. The stochastic origin, however, emphasizes that because the atmospheric activities can be thought as having no preferred timescale and are associated with an essentially white noise spectrum, the ocean response can manifest a red peak in a certain low frequency range with a decadal to interdecadal timescale. In this paper, the authors try to systematically understand the state of the art of observational, theoretical and numerical studies on the PDO and hope to provide a useful background reference for current research.

Key words

climate system Pacific decadal oscillation deterministic origin stochastic origin 

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Copyright information

© Advances in Atmospheric Sciences 2003

Authors and Affiliations

  • Yang Haijun
    • 1
  • Zhang Qiong
    • 2
  1. 1.Department of Atmospheric Science, School of PhysicsPeking UniversityBeijing
  2. 2.State Key Laboratory of Atmospheric Science and Geophysical Fluid Dynamics, Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing

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