| The Impact of Global Warming on the Pacific Decadal Oscillation and the Possible Mechanism简 |
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| 作者姓名： | FANG Changfang WU Lixin ZHANG Xiang |
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| 基金项目： | supported by the National Natural Science Foundation of China(NSFC)Creative Group Project(Grant No.41221063);Major Research Project(Grant No.2013CB956200) |
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| 摘 要： | The response of the Pacific Decadal Oscillation （PDO） to global warming according to the Fast Ocean Atmosphere Model （FOAM） and global warming comparison experiments of 11 IPCC AR4 models is investigated. The results show that North Pacific ocean decadal variability, its dominant mode （i.e., PDO）, and atmospheric decadal variability, have become weaker under global warming, but with PDO shifting to a higher frequency. The SST decadal variability reduction maximum is shown to be in the subpolar North Pacific Ocean and western North Pacific （PDO center）. The atmospheric decadal variability reduction maximum is over the PDO center. It was also found that oceanic baroclinic Rossby waves play a key role in PDO dynamics, especially those in the subpolar ocean. As the frequency of ocean buoyancy increases under a warmer climate, oceanic baroclinic Rossby waves become faster, and the increase in their speed ratio in the high latitudes is much larger than in the low latitudes. The faster baroclinic Rossby waves can cause the PDO to shift to a higher frequency, and North Pacific decadal variability and PDO to become weaker.
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| 关 键 词： | 太平洋年代际振荡 全球气候变暖 可能机制 Rossby波 年代际变化 年代际变率 北太平洋 全球变暖 |
The impact of global warming on the pacific decadal oscillation and the possible mechanism |
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| FANG Changfang,WU Lixin,ZHANG Xiang.The impact of global warming on the pacific decadal oscillation and the possible mechanism[J].Advances in Atmospheric Sciences,2014,31(1):118-130. |
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| Authors: | Changfang Fang Lixin Wu Xiang Zhang |
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| Institution: | 1. Physical Oceanography Laboratory, Ocean University of China, Qingdao, 26600, China
2. Navy Marine Hydrometeorological Center of the Chinese PLA, Beijing, 100161, China
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| Abstract: | The response of the Pacific Decadal Oscillation (PDO) to global warming according to the Fast Ocean Atmosphere Model (FOAM) and global warming comparison experiments of 11 IPCC AR4 models is investigated. The results show that North Pacific ocean decadal variability, its dominant mode (i.e., PDO), and atmospheric decadal variability, have become weaker under global warming, but with PDO shifting to a higher frequency. The SST decadal variability reduction maximum is shown to be in the subpolar North Pacific Ocean and western North Pacific (PDO center). The atmospheric decadal variability reduction maximum is over the PDO center. It was also found that oceanic baroclinic Rossby waves play a key role in PDO dynamics, especially those in the subpolar ocean. As the frequency of ocean buoyancy increases under a warmer climate, oceanic baroclinic Rossby waves become faster, and the increase in their speed ratio in the high latitudes is much larger than in the low latitudes. The faster baroclinic Rossby waves can cause the PDO to shift to a higher frequency, and North Pacific decadal variability and PDO to become weaker. |
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| Keywords: | Pacific Ocean decadal variability Pacific Decadal Oscillation global warming baroclinic Rossby waves |
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