Climate Change Research ›› 2016, Vol. 12 ›› Issue (6): 494-499.doi: 10.12006/j.issn.1673-1719.2016.051

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The Climate Shift of the Dominant Modes of North Pacific During Winter

Lü Qingping1, Zhang Lifeng2, Zhang Ming2   

  1. 1 Oceanography and Meteorology Center, China People’s Liberation Army East Sea Fleet, Ningbo 315122, China
    2 College of Meteorology and Oceanography, China People’s Liberation Army University of Science and Technology, Nanjing 211101, China
  • Received:2016-03-15 Revised:2016-07-25 Online:2016-11-30 Published:2016-11-30


Empirical Orthogonal Function (EOF), wavelet analysis and resemblance analysis methods were used to research the variation of the structure feature of Pacific Decadal Oscillation (PDO) mode and North Pacific Gyre Oscillation (NPGO) mode. The spatial similarity coefficients between the Sea Surface Temperature Anomaly (SSTA) and the PDO mode, NPGO mode were computed separately. The results show that the spatial field of SSTA was more and more similar to that of the NPGO mode after 1988/1989, and the climate shift had a period of 18 years. Then, the 20-year moving average of the two similarity coefficients show that the latter one was greater than the former after 1984, which meant that the spatial shift of SSTA occurred about 1984. Lastly, the spatial feature of the averaged SSTA of some special periods also show that the structure feature of SSTA became NPGO-like mode from PDO-like mode after the 1980s.

Key words: North Pacific, SSTA, dominant climate mode, climate shift

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