Climate Change Research ›› 2020, Vol. 16 ›› Issue (4): 442-452.doi: 10.12006/j.issn.1673-1719.2019.205

• Changes in Climate System • Previous Articles     Next Articles

Differences of decadal oscillations between global warming of 1.5℃ and 2℃ in the North Pacific

FENG Jing1,2, LI Chun1,2(), FAN Lei1,2   

  1. 1 Key Laboratory of Physical Oceanography, Ocean University of China, Qingdao 266100, China
    2 Qingdao National Laboratory for Marine Science and Technology, Qingdao 266100, China
  • Received:2019-09-05 Revised:2019-11-22 Online:2020-07-30 Published:2020-08-05
  • Contact: LI Chun


Based on the simulation results of CESM model under stable warming scenarios of 1.5 and 2℃, the amplitude and period of PDO and NPGO change during pre-industrial, historical and two stable warming periods are analyzed and compared. The results show that during stable warming periods of 1.5 and 2℃, the amplitude of both PDO and NPGO is weaker than that during historical period, and the time scale is decreased as well, which may be due to the acceleration of Rossby wave speed caused by enhancement of ocean layer under global warming scenarios. There are no significant differences in amplitude and time scale of PDO between the two stable warming scenarios, while the amplitude of NPGO is weaker and the period is decreased by about 1 year significantly during stable warming 2℃ compared to stable warming 1.5℃ period. Therefore, the 0.5℃ warming difference has a little impact on the amplitude and period of PDO, while mainly influences the amplitude and period of NPGO.

Key words: Global warming, Pacific Decadal Oscillation (PDO), North Pacific Gyre Oscillation (NPGO), Rossby wave

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