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Weak ENSO Asymmetry Due to Weak Nonlinear Air-Sea Interaction in CMIP5 Climate Models
Sun, Yan1,2; Wang, Fan1,2; Sun, De-Zheng3,4
2016-03-01
发表期刊ADVANCES IN ATMOSPHERIC SCIENCES
卷号33期号:3页码:352-364
文章类型Article
摘要State-of-the-art climate models have long-standing intrinsic biases that limit their simulation and projection capabilities. Significantly weak ENSO asymmetry and weakly nonlinear air-sea interaction over the tropical Pacific was found in CMIP5 (Coupled Model Intercomparison Project, Phase 5) climate models compared with observation. The results suggest that a weak nonlinear air-sea interaction may play a role in the weak ENSO asymmetry. Moreover, a weak nonlinearity in air-sea interaction in the models may be associated with the biases in the mean climate-the cold biases in the equatorial central Pacific. The excessive cold tongue bias pushes the deep convection far west to the western Pacific warm pool region and suppresses its development in the central equatorial Pacific. The deep convection has difficulties in further moving to the eastern equatorial Pacific, especially during extreme El Nino events, which confines the westerly wind anomaly to the western Pacific. This weakens the eastern Pacific El Nino events, especially the extreme El Nino events, and thus leads to the weakened ENSO asymmetry in climate models. An accurate mean state structure (especially a realistic cold tongue and deep convection) is critical to reproducing ENSO events in climate models. Our evaluation also revealed that ENSO statistics in CMIP5 climate models are slightly improved compared with those of CMIP3. The weak ENSO asymmetry in CMIP5 is closer to the observation. It is more evident in CMIP5 that strong ENSO activities are usually accompanied by strong ENSO asymmetry, and the diversity of ENSO amplitude is reduced.
关键词Enso Asymmetry Nonlinearity Air-sea Interaction Cold Tongue Cmip5 Deep Convection
DOI10.1007/s00376-015-5018-6
收录类别SCI
语种英语
WOS记录号WOS:000370030300008
引用统计
文献类型期刊论文
条目标识符http://ir.qdio.ac.cn/handle/337002/112462
专题海洋环流与波动重点实验室
作者单位1.Chinese Acad Sci, Inst Oceanol, Key Lab Ocean Circulat & Waves, Qingdao 266071, Peoples R China
2.Qingdao Natl Lab Marine Sci & Technol, Lab Ocean Dynam & Climate, Qingdao 266071, Peoples R China
3.Univ Colorado, Cooperat Inst Res Environm Sci, Boulder, CO 80305 USA
4.NOAA, Earth Syst Res Lab, Div Phys Sci, Boulder, CO 80305 USA
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Sun, Yan,Wang, Fan,Sun, De-Zheng. Weak ENSO Asymmetry Due to Weak Nonlinear Air-Sea Interaction in CMIP5 Climate Models[J]. ADVANCES IN ATMOSPHERIC SCIENCES,2016,33(3):352-364.
APA Sun, Yan,Wang, Fan,&Sun, De-Zheng.(2016).Weak ENSO Asymmetry Due to Weak Nonlinear Air-Sea Interaction in CMIP5 Climate Models.ADVANCES IN ATMOSPHERIC SCIENCES,33(3),352-364.
MLA Sun, Yan,et al."Weak ENSO Asymmetry Due to Weak Nonlinear Air-Sea Interaction in CMIP5 Climate Models".ADVANCES IN ATMOSPHERIC SCIENCES 33.3(2016):352-364.
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