Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1029/2018GL081776 |
The Impact of Strong El Nino and La Nina Events on the North Atlantic | |
Hardiman, S. C.1; Dunstone, N. J.1; Scaife, A. A.1,2; Smith, D. M.1; Ineson, S.1; Lim, J.1; Fereday, D.1 | |
2019-03-16 | |
发表期刊 | GEOPHYSICAL RESEARCH LETTERS
![]() |
ISSN | 0094-8276 |
EISSN | 1944-8007 |
出版年 | 2019 |
卷号 | 46期号:5页码:2874-2883 |
文章类型 | Article |
语种 | 英语 |
国家 | England |
英文摘要 | The impact of strong La Nina events on January-February North Atlantic mean sea level pressure is unknown, as these events have never been observed. Using large ensembles from the Met Office decadal prediction system, examples of strong La Nina events are simulated and the Atlantic response to these is found to be a positive North Atlantic Oscillation. This is very different to the wavelike response observed and simulated for strong El Nino events. The reason for this difference is traced to the fact that the December-January-February mean tropospheric teleconnection of El Nino-Southern Oscillation to the North Atlantic dominates for strong El Nino events, while the stratospheric teleconnection dominates for strong La Nina events. The strength of the tropospheric pathway grows linearly and symmetrically with El Nino-Southern Oscillation. The stratospheric pathway is the source of the asymmetry between January and February surface responses to strong El Nino and strong La Nina events. Plain Language Summary The El Nino-Southern Oscillation has a large impact on January-February North Atlantic mean sea level pressure (MSLP), important for forecasting the mean climate over the United Kingdom and Northern Europe during these months. Simulations from the Met Office decadal prediction system are used to research the impact of strong negative (La Nina) events, not yet observed in nature. Really strong positive (El Nino) and negative (La Nina) events are found to have an asymmetric impact on the North Atlantic. This paper studies the reasons why. El Nino-Southern Oscillation impacts the North Atlantic via two routesone through the tropical Atlantic in the lower atmosphere (troposphere) and one through the middle atmosphere (stratosphere) in polar latitudes. It is found that the tropospheric pathway dominates for El Nino events, leading to a wavelike response in North Atlantic MSLP, characterized by a high pressure west of the United Kingdom. However, the stratospheric pathway dominates for La Nina events leading to a different MSLP pattern, characterized by high pressure over the Azores and low pressure over Iceland. Therefore, if a really strong La Nina event were ever to occur, the United Kingdom and Northern Europe might experience a very wet winter. |
英文关键词 | ENSO teleconnections seasonal prediction NAO |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000462612900060 |
WOS关键词 | ATMOSPHERIC CIRCULATION ; SOUTHERN-OSCILLATION ; WINTER STRATOSPHERE ; ENSO ; CLIMATE ; PREDICTABILITY ; ASYMMETRY ; NONLINEARITY ; VARIABILITY ; TROPOSPHERE |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
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/181650 |
专题 | 气候变化 |
作者单位 | 1.Met Off Hadley Ctr, Exeter, Devon, England; 2.Univ Exeter, Coll Engn Math & Phys Sci, Exeter, Devon, England |
推荐引用方式 GB/T 7714 | Hardiman, S. C.,Dunstone, N. J.,Scaife, A. A.,et al. The Impact of Strong El Nino and La Nina Events on the North Atlantic[J]. GEOPHYSICAL RESEARCH LETTERS,2019,46(5):2874-2883. |
APA | Hardiman, S. C..,Dunstone, N. J..,Scaife, A. A..,Smith, D. M..,Ineson, S..,...&Fereday, D..(2019).The Impact of Strong El Nino and La Nina Events on the North Atlantic.GEOPHYSICAL RESEARCH LETTERS,46(5),2874-2883. |
MLA | Hardiman, S. C.,et al."The Impact of Strong El Nino and La Nina Events on the North Atlantic".GEOPHYSICAL RESEARCH LETTERS 46.5(2019):2874-2883. |
条目包含的文件 | 条目无相关文件。 |
除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。
修改评论