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DOI | 10.1002/joc.6063 |
Weakening of the El Nino amplitude since the late 1990s and its link to decadal change in the North Pacific climate | |
Xu, Kang1,2; Wang, Weiqiang1,2,3; Liu, Boqi4; Zhu, Congwen4 | |
2019-08-01 | |
发表期刊 | INTERNATIONAL JOURNAL OF CLIMATOLOGY
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ISSN | 0899-8418 |
EISSN | 1097-0088 |
出版年 | 2019 |
卷号 | 39期号:10页码:4125-4138 |
文章类型 | Article |
语种 | 英语 |
国家 | Peoples R China |
英文摘要 | The amplitude of El Nino, measured by the Nino3.4 sea surface temperature anomaly (SSTA) index, has exhibited an interdecadal change with a weakening trend since the late 1990s, characterized by the distinct Bjerknes stability index between 1980-1998 and 1999-2014. Statistical results suggest that this was primarily induced by the attenuation of the zonal wind stress and low-level wind anomalies in response to the zonal equatorial SSTA gradient. The weakened atmospheric responses to the zonal equatorial SSTA gradient were associated with the obvious westward extension of the negative sea level pressure anomalies (SLPA) over the tropics. This was mainly attributed to the transition of the dominant atmospheric circulation over the North Pacific, where the Aleutian Low (AL) mode was replaced by the North Pacific Oscillation (NPO) mode after the late 1990s. Numerical experiments from the long-term historical simulations of the GFDL-CM3 model indicate that both of the AL and NPO were dominant over the North Pacific and alternated on the interdecadal time-scale. When the NPO mode was dominant, it became more effective at playing a role in triggering an El Nino in the central Pacific via the seasonal footprinting mechanism over the subtropical northeastern Pacific. Such a change might cause the westward shift of the tropical SLPA and the attenuated atmospheric responses to the zonal SSTA gradient, ultimately resulting in the weakening of the El Nino amplitude. |
英文关键词 | Aleutian Low Bjerknes positive feedback El Nino interdecadal change North Pacific Oscillation |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000479031900016 |
WOS关键词 | 20-1ST-CENTURY SHIFT ; MERIDIONAL MODES ; ENSO ; VARIABILITY ; OSCILLATION ; OCEAN ; ASYMMETRY ; FLUCTUATIONS ; MODULATIONS ; IMPACT |
WOS类目 | Meteorology & Atmospheric Sciences |
WOS研究方向 | Meteorology & Atmospheric Sciences |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/185695 |
专题 | 气候变化 |
作者单位 | 1.Chinese Acad Sci, South China Sea Inst Oceanol, State Key Lab Trop Oceanog, Guangzhou, Guangdong, Peoples R China; 2.Xiamen Univ, State Key Lab Marine Environm Sci, Xiamen, Fujian, Peoples R China; 3.Qingdao Natl Lab Marine Sci & Technol, Lab Reg Oceanog & Numer Modeling, Qingdao, Shandong, Peoples R China; 4.Chinese Acad Meteorol Sci, Inst Climate Syst, State Key Lab Severe Weather, Beijing, Peoples R China |
推荐引用方式 GB/T 7714 | Xu, Kang,Wang, Weiqiang,Liu, Boqi,et al. Weakening of the El Nino amplitude since the late 1990s and its link to decadal change in the North Pacific climate[J]. INTERNATIONAL JOURNAL OF CLIMATOLOGY,2019,39(10):4125-4138. |
APA | Xu, Kang,Wang, Weiqiang,Liu, Boqi,&Zhu, Congwen.(2019).Weakening of the El Nino amplitude since the late 1990s and its link to decadal change in the North Pacific climate.INTERNATIONAL JOURNAL OF CLIMATOLOGY,39(10),4125-4138. |
MLA | Xu, Kang,et al."Weakening of the El Nino amplitude since the late 1990s and its link to decadal change in the North Pacific climate".INTERNATIONAL JOURNAL OF CLIMATOLOGY 39.10(2019):4125-4138. |
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