气候变化领域集成服务门户(CCPortal): Changes of decadal sst variations in the subpolar north atlantic under strong CO2 forcing as an indicator for the ocean circulation's contribution to atlantic multidecadal variability

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DOI	10.1175/JCLI-D-18-0739.1
	Changes of decadal sst variations in the subpolar north atlantic under strong CO2 forcing as an indicator for the ocean circulation's contribution to atlantic multidecadal variability
	Hand R.; Bader J.; Matei D.; Ghosh R.; Jungclaus J.H.
发表日期	2020
ISSN	08948755
起始页码	3213
结束页码	3228
卷号	33 期号:8
英文摘要	The question of whether ocean dynamics are relevant for basin-scale North Atlantic decadal temperature variability is the subject of ongoing discussions. Here, we analyze a set of simulations with a single climate model consisting of a 2000-yr preindustrial control experiment, a 100-member historical ensemble, and a 100-member ensemble forced with an incremental CO2 increase by 1% yr21. Compared to previous approaches, our setup offers the following advantages: First, the large ensemble size allows us to robustly separate internally and externally forced variability and to robustly detect statistical links between different quantities. Second, the availability of different scenarios allows us to investigate the role of the background state for drivers of the variability. We find strong evidence that ocean dynamics, particularly ocean heat transport variations, form an important contribution to generate the Atlantic multidecadal variability (AMV) in the Max Planck Institute Earth System Model (MPI-ESM). Particularly the northwest North Atlantic is substantially affected by ocean circulation for the historical and preindustrial simulations. Anomalies of the Labrador Sea deep ocean density precede a change of the Atlantic meridional overturning circulation (AMOC) and heat advection to the region south of Greenland. Under strong CO2 forcing, the AMV-SST regression pattern shows crucial changes: SST variability in the northwestern part of the North Atlantic is strongly reduced, so that the AMV pattern in this scenario is dominated by the low-latitude branch. We found a connection to changes in the deep-water formation that cause a strong reduction of the mean AMOC and its variability. Consequently, ocean heat transport convergence becomes less important for the SST variability south of Greenland. © 2020 American Meteorological Society. For information regarding reuse of this content and general copyright information, consult the AMS Copyright Policy (www.ametsoc.org/PUBSReuseLicenses).
语种	英语
scopus关键词	Carbon dioxide; Climate models; Heat transfer; Atlantic meridional overturning circulations; Control experiments; Deep-water formation; Max Planck Institute; Multidecadal variability; Ocean heat transport; Subpolar North Atlantic; Temperature variability; Oceanography; air-sea interaction; atmospheric forcing; carbon dioxide; climate modeling; decadal variation; ensemble forecasting; oceanic circulation; overturn; sea surface temperature; Arctic; Atlantic Ocean; Atlantic Ocean (North); Greenland; Labrador Sea
来源期刊	Journal of Climate
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/178741
作者单位	Max Planck Institute for Meteorology, Hamburg, Germany; Oeschger Centre for Climate Change Research, Institute of Geography, University of Bern, Bern, Switzerland; Uni Climate, Uni Research, Bjerknes Centre for Climate Research, Bergen, Norway; Department of Meteorology, University of Reading, Reading, United Kingdom
推荐引用方式 GB/T 7714	Hand R.,Bader J.,Matei D.,et al. Changes of decadal sst variations in the subpolar north atlantic under strong CO2 forcing as an indicator for the ocean circulation's contribution to atlantic multidecadal variability[J],2020,33(8).
APA	Hand R.,Bader J.,Matei D.,Ghosh R.,&Jungclaus J.H..(2020).Changes of decadal sst variations in the subpolar north atlantic under strong CO2 forcing as an indicator for the ocean circulation's contribution to atlantic multidecadal variability.Journal of Climate,33(8).
MLA	Hand R.,et al."Changes of decadal sst variations in the subpolar north atlantic under strong CO2 forcing as an indicator for the ocean circulation's contribution to atlantic multidecadal variability".Journal of Climate 33.8(2020).