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DOI | 10.1029/2018GL080474 |
Key Role of Internal Ocean Dynamics in Atlantic Multidecadal Variability During the Last Half Century | |
Kim, Who M.; Yeager, Stephen G.; Danabasoglu, Gokhan | |
2018-12-28 | |
发表期刊 | GEOPHYSICAL RESEARCH LETTERS |
ISSN | 0094-8276 |
EISSN | 1944-8007 |
出版年 | 2018 |
卷号 | 45期号:24页码:13449-13457 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | This study presents multiple lines of evidence from observations and model simulations that support a key role for ocean dynamics, rather than external forcings, in Atlantic multidecadal variability (AMV) during the last half century. Observed AMV fingerprints considered here include the low-frequency spatiotemporal evolution of sea surface temperature, surface heat fluxes, and deep ocean hydrography. While largely absent in the forced response of a large ensemble historical simulations (LENSs), these fingerprints are clearly discernible in a long control simulation where the variability is purely internal. Further evidence derives from initialized decadal prediction simulations, which exhibit much higher skill at predicting the observed AMV of the past 50years than LENS. The high correlation between the observed AMV and the externally forced version derived from LENS, which has been invoked as evidence for externally driven AMV, is shown to be largely an artifact of concurrent warming since the 1990s. Plain Language Summary The basin-wide sea surface temperature variability in the North Atlantic on multidecadal timescales, often called Atlantic multidecadal variability (AMV), has profound impacts on surface climate in the Northern Hemisphere. This work sheds light on the ongoing debate regarding the driving mechanisms of the AMV: whether it is primarily driven by factors associated with natural fluctuations of the coupled ocean-atmosphere system (such as slow changes in the strength of the ocean circulation) or forced by factors that are external to that system (such as large volcanic eruptions). In this study, we present multiple lines of evidence, from ocean observations as well as climate model simulations, that suggest that AMV is largely attributable to the former and is thus primarily reflecting a natural mode of variability in the climate system. |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000456404600030 |
WOS关键词 | SEA-SURFACE TEMPERATURE ; THERMOHALINE CIRCULATION ; HEAT-FLUX ; CLIMATE ; SALINITY ; SIMULATIONS ; OSCILLATION ; SIGNATURE |
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/26732 |
专题 | 气候变化 |
作者单位 | Natl Ctr Atmospher Res, Climate & Global Dynam Lab, POB 3000, Boulder, CO 80307 USA |
推荐引用方式 GB/T 7714 | Kim, Who M.,Yeager, Stephen G.,Danabasoglu, Gokhan. Key Role of Internal Ocean Dynamics in Atlantic Multidecadal Variability During the Last Half Century[J]. GEOPHYSICAL RESEARCH LETTERS,2018,45(24):13449-13457. |
APA | Kim, Who M.,Yeager, Stephen G.,&Danabasoglu, Gokhan.(2018).Key Role of Internal Ocean Dynamics in Atlantic Multidecadal Variability During the Last Half Century.GEOPHYSICAL RESEARCH LETTERS,45(24),13449-13457. |
MLA | Kim, Who M.,et al."Key Role of Internal Ocean Dynamics in Atlantic Multidecadal Variability During the Last Half Century".GEOPHYSICAL RESEARCH LETTERS 45.24(2018):13449-13457. |
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