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Intraseasonal variability of the tropical Pacific subsurface temperature in the two flavours of El Nino
Feng, Junqiao1,2; Wang, Qingye1,2; Hu, Shijian1,2; Hu, Dunxin1,2
2016-02-01
发表期刊INTERNATIONAL JOURNAL OF CLIMATOLOGY
卷号36期号:2页码:867-884
文章类型Article
摘要The spatial structure and temporal evolution of the intraseasonal variability (ISV) of the subsurface ocean temperature (STA) in the equatorial Pacific associated with the two flavours of El Nino [i.e. the canonical or eastern Pacific (EP) El Nino and the central Pacific (CP) El Nino] are investigated using observations and 1.5-layer linear reduced gravity model. Results suggest that the ISV characteristics show some differences in the two types of El Nino, although both oscillate along the thermocline in the form of the intraseasonal equatorial Kelvin wave (IEKW), which is excited in the western tropical Pacific by the zonal wind stress associated with the Madden-Julian oscillation (MJO). First, the period of dominant mode of the STA ISV during CP El Nino broadly distributes in 50-80 days with the spectra peaking in 60-65 days. By contrast, the spectrum of STA ISV during EP El Nino shows a peak in 75-80-day period. This indicates that the wave speed is faster in the CP El Nino than in EP El Nino. Second, the ISV activity peaks in previous spring during the developing phase of EP El Nino, whereas during CP El Nino it becomes the most active during the mature phase. Third, the strongest IEKW occurs in the CP around the dateline during CP El Nino and attenuates quickly east of 130 degrees W due to strong eddy viscosity dissipation, while the IEKW during the EP El Nino propagates efficiently from the western to the eastern Pacific with a relative weak diffusion.
关键词Equatorial Pacific Ocean Subsurface Ocean Temperature Intraseasonal Variability Eastern Pacific El Nino Central Pacific El Nino
DOI10.1002/joc.4389
收录类别SCI
语种英语
WOS记录号WOS:000369991700024
引用统计
被引频次:1[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.qdio.ac.cn/handle/337002/112458
专题海洋环流与波动重点实验室
作者单位1.Chinese Acad Sci, Inst Oceanol, Qingdao 266071, Peoples R China
2.Chinese Acad Sci, Key Lab Ocean Circulat & Waves, Qingdao 266071, Peoples R China
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Feng, Junqiao,Wang, Qingye,Hu, Shijian,et al. Intraseasonal variability of the tropical Pacific subsurface temperature in the two flavours of El Nino[J]. INTERNATIONAL JOURNAL OF CLIMATOLOGY,2016,36(2):867-884.
APA Feng, Junqiao,Wang, Qingye,Hu, Shijian,&Hu, Dunxin.(2016).Intraseasonal variability of the tropical Pacific subsurface temperature in the two flavours of El Nino.INTERNATIONAL JOURNAL OF CLIMATOLOGY,36(2),867-884.
MLA Feng, Junqiao,et al."Intraseasonal variability of the tropical Pacific subsurface temperature in the two flavours of El Nino".INTERNATIONAL JOURNAL OF CLIMATOLOGY 36.2(2016):867-884.
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