Climate Dynamics

, Volume 46, Issue 11–12, pp 3657–3667 | Cite as

Dynamics and mechanisms of decadal variability of the Pacific-South America mode over the 20th century

  • Li Zhang
  • Hao Ma
  • Lixin Wu


In this paper, decadal variability of the Pacific-South America (PSA) mode is examined from year 1871 to 2008 based on the newly developed ocean and atmosphere reanalysis products. The PSA mode, mirroring the Pacific-North America mode in the Northern Hemisphere, emerges as the second EOF mode of 500 mb geopotential height anomalies. The mode displays substantial interannual-decadal variability with distinct timescales between 3–8 and 10–18 years, respectively. The decadal variability of the PSA mode is found to be associated with the coupled ocean–atmosphere interaction over the subtropical South and tropical Pacific. The subduction of the subtropical temperature anomalies in the South Pacific in conjunction with the tropical–subtropical atmospheric teleconnection plays important role in the decadal variability of the PSA mode.


Pacific-South American Subduction Decadal variability Tropical Pacific 



This work is supported by National Natural Science Foundation of China (NSFC) Key Project (41130859), NSFC Innovation Project (41221063), and Zhejiang Provincial Natural Science Foundation of China (LQ14D050001). Discussions with Profs. Wenju Cai and Xiaojun Yuan are greatly appreciated.


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Copyright information

© Springer-Verlag Berlin Heidelberg 2015

Authors and Affiliations

  1. 1.Physical Oceanography Laboratory/Qingdao Collaborative Innovation Center of Marine Science and TechnologyOcean University of ChinaQingdaoPeople’s Republic of China
  2. 2.Zhejiang Climate CenterZhejiang Meteorological BureauHangzhouPeople’s Republic of China

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