气候变化领域集成服务门户(CCPortal): The dependence of the northern extratropical climate response to external forcing on the phase of Atlantic Multidecadal Variability

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DOI	10.1007/s00382-020-05278-3
	The dependence of the northern extratropical climate response to external forcing on the phase of Atlantic Multidecadal Variability
	Hyatt S.R.; Fletcher C.G.; Cassou C.; Ruprich-Robert Y.; Terray L.
发表日期	2020
ISSN	0930-7575
起始页码	487
结束页码	502
卷号	55
英文摘要	The extent to which decadal-to-multidecadal climate trends forced by carbon dioxide (CO 2) and anthropogenic aerosol (AER) emissions depend on the phase and amplitude of internal modes of climate variability, such as Atlantic Multidecadal Variability (AMV), is an open question. This study uses a fully coupled CMIP5-era general circulation model (GCM) to investigate climate trends forced by increasing CO 2 and AER in the presence of opposite decaying phases of the AMV. Ensembles of simulations are initialized from extreme warm (AMV (+)) and cold (AMV (-)) phases of AMV and, while the global mean temperature trends are similar, significant regional differences are found over the Arctic and northern extratropics. Specifically, the response to CO 2 forcing is hemispherically asymmetric, with western Eurasia warming 20–30% more, and North America and the extratropical North Pacific warming 20–30% less, in AMV (+) than in AMV (-). This asymmetry is explained by the atmospheric response to differences in the initial concentration of sea ice in the Atlantic Arctic sector, and by a large-scale atmospheric teleconnection pattern originating in the tropical Indo-Pacific. A decomposition of the temperature trends reveals that the AMV influence occurs mostly through atmospheric dynamics; however, thermodynamic processes are important in regions of sea ice change, western Eurasia, and eastern North America. The difference in the responses to CO 2 and AER forcing between AMV phases reveals that some aspects of the AMV modulation of the response, such as a more positive (negative) temperature trend in AMV (+) than in AMV (-) in western Eurasia (the extratropical North Pacific), are largely independent of the sign, magnitude and spatial pattern of external forcing. © 2020, Springer-Verlag GmbH Germany, part of Springer Nature.
英文关键词	Atlantic Multidecadal Variability; Climate modelling; Dynamics; Internal variability; Tropical-extratropical teleconnections
语种	英语
scopus关键词	aerosol; Atlantic Multidecadal Oscillation; atmospheric forcing; climate modeling; CMIP; decadal variation; ensemble forecasting; extratropical environment; source apportionment; trend analysis; North America; Pacific Ocean; Pacific Ocean (North)
来源期刊	Climate Dynamics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/145391
作者单位	Department of Applied Mathematics, University of Waterloo, Waterloo, Canada; Department of Geography and Environmental Management, University of Waterloo, Waterloo, Canada; Université de Toulouse, CECI, CNRS-Cerfacs, Toulouse, France; Barcelona Supercomputing Center, Barcelona, Spain; CNRS-CERFACS, Toulouse, France
推荐引用方式 GB/T 7714	Hyatt S.R.,Fletcher C.G.,Cassou C.,et al. The dependence of the northern extratropical climate response to external forcing on the phase of Atlantic Multidecadal Variability[J],2020,55.
APA	Hyatt S.R.,Fletcher C.G.,Cassou C.,Ruprich-Robert Y.,&Terray L..(2020).The dependence of the northern extratropical climate response to external forcing on the phase of Atlantic Multidecadal Variability.Climate Dynamics,55.
MLA	Hyatt S.R.,et al."The dependence of the northern extratropical climate response to external forcing on the phase of Atlantic Multidecadal Variability".Climate Dynamics 55(2020).