气候变化领域集成服务门户(CCPortal): Teleconnections and relationship between the El Niño-Southern Oscillation (ENSO) and the Southern Annular Mode (SAM) in reconstructions and models over the past millennium

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DOI	10.5194/cp-16-743-2020
	Teleconnections and relationship between the El Niño-Southern Oscillation (ENSO) and the Southern Annular Mode (SAM) in reconstructions and models over the past millennium
	Dätwyler C.; Grosjean M.; Steiger N.J.; Neukom R.
发表日期	2020
ISSN	18149324
起始页码	743
结束页码	756
卷号	16 期号:2
英文摘要	The climate of the Southern Hemisphere (SH) is strongly influenced by variations in the El Niño-Southern Oscillation (ENSO) and the Southern Annular Mode (SAM). Because of the limited length of instrumental records in most parts of the SH, very little is known about the relationship between these two key modes of variability over time. Using proxy-based reconstructions and last-millennium climate model simulations, we find that ENSO and SAM indices are mostly negatively correlated over the past millennium. Pseudo-proxy experiments indicate that currently available proxy records are able to reliably capture ENSO-SAM relationships back to at least 1600 CE. Palaeoclimate reconstructions show mostly negative correlations back to about 1400 CE. An ensemble of last-millennium climate model simulations confirms this negative correlation, showing a stable correlation of approximately -0.3. Despite this generally negative relationship we do find intermittent periods of positive ENSO-SAM correlations in individual model simulations and in the palaeoclimate reconstructions. We do not find evidence that these relationship fluctuations are caused by exogenous forcing nor by a consistent climate pattern. However, we do find evidence that strong negative correlations are associated with strong positive (negative) anomalies in the Interdecadal Pacific Oscillation and the Amundsen Sea Low during periods when SAM and ENSO indices are of opposite (equal) sign. © Author(s) 2020.
语种	英语
scopus关键词	climate modeling; correlation; decadal variation; El Nino-Southern Oscillation; paleoclimate; simulation; teleconnection; Amundsen Sea; Southern Ocean
来源期刊	Climate of the Past
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/146720
作者单位	Institute of Geography, Oeschger Centre for Climate Change Research, University of Bern, Bern, 3012, Switzerland; Lamont-Doherty Earth Observatory, Columbia University, Palisades, NY, United States; Department of Geosciences, University of Fribourg, Fribourg, Switzerland; Department of Geography, University of Zurich, Zurich, Switzerland
推荐引用方式 GB/T 7714	Dätwyler C.,Grosjean M.,Steiger N.J.,et al. Teleconnections and relationship between the El Niño-Southern Oscillation (ENSO) and the Southern Annular Mode (SAM) in reconstructions and models over the past millennium[J],2020,16(2).
APA	Dätwyler C.,Grosjean M.,Steiger N.J.,&Neukom R..(2020).Teleconnections and relationship between the El Niño-Southern Oscillation (ENSO) and the Southern Annular Mode (SAM) in reconstructions and models over the past millennium.Climate of the Past,16(2).
MLA	Dätwyler C.,et al."Teleconnections and relationship between the El Niño-Southern Oscillation (ENSO) and the Southern Annular Mode (SAM) in reconstructions and models over the past millennium".Climate of the Past 16.2(2020).