气候变化领域集成服务门户(CCPortal): Natural variability of the Arctic Ocean sea ice during the present interglacial

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DOI	10.1073/pnas.2008996117
	Natural variability of the Arctic Ocean sea ice during the present interglacial
	De Vernal A.; Hillaire-Marcel C.; Le Duc C.; Roberge P.; Brice C.; Matthiessen J.; Spielhagen R.F.; Stein R.
发表日期	2020
ISSN	0027-8424
起始页码	26069
结束页码	26075
卷号	117 期号:42
英文摘要	The impact of the ongoing anthropogenic warming on the Arctic Ocean sea ice is ascertained and closely monitored. However, its long-term fate remains an open question as its natural variability on centennial to millennial timescales is not well documented. Here, we use marine sedimentary records to reconstruct Arctic sea-ice fluctuations. Cores collected along the Lomonosov Ridge that extends across the Arctic Ocean from northern Greenland to the Laptev Sea were radiocarbon dated and analyzed for their micropaleontological and palynological contents, both bearing information on the past sea-ice cover. Results demonstrate that multiyear pack ice remained a robust feature of the western and central Lomonosov Ridge and that perennial sea ice remained present throughout the present interglacial, even during the climate optimum of the middle Holocene that globally peaked ~6,500 y ago. In contradistinction, the southeastern Lomonosov Ridge area experienced seasonally sea-ice-free conditions, at least, sporadically, until about 4,000 y ago. They were marked by relatively high phytoplanktonic productivity and organic carbon fluxes at the seafloor resulting in low biogenic carbonate preservation. These results point to contrasted west-east surface ocean conditions in the Arctic Ocean, not unlike those of the Arctic dipole linked to the recent loss of Arctic sea ice. Hence, our data suggest that seasonally ice-free conditions in the southeastern Arctic Ocean with a dominant Arctic dipolar pattern, may be a recurrent feature under "warm world" climate. © 2020 National Academy of Sciences. All rights reserved.
英文关键词	Arctic; Climate; Holocene; Ocean; Sea ice
语种	英语
scopus关键词	carbon; carbon 14; carbonic acid; ice; Arctic Ocean; Article; carbon footprint; climate; glacier; Greenland; phytoplankton; priority journal; sea; sedimentation
来源期刊	Proceedings of the National Academy of Sciences of the United States of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/159024
作者单位	De Vernal, A., Geotop-Université du Québec À Montréal, Montréal, QC H3C 3P8, Canada; Hillaire-Marcel, C., Geotop-Université du Québec À Montréal, Montréal, QC H3C 3P8, Canada; Le Duc, C., Geotop-Université du Québec À Montréal, Montréal, QC H3C 3P8, Canada; Roberge, P., Geotop-Université du Québec À Montréal, Montréal, QC H3C 3P8, Canada; Brice, C., Geotop-Université du Québec À Montréal, Montréal, QC H3C 3P8, Canada; Matthiessen, J., Geosciences/Marine Geology, Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Bremerhaven, 27568, Germany; Spielhagen, R.F., Ocean Circulation and Climate Dynamics Division, GEOMAR Helmholtz Centre for Ocean Research, Kiel, 24148, Germany; Stein, R., Geosciences/Marine Geology, Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Bremerhaven, 27568, Germany, MARUM Center for Marine Environmental Sciences, Faculty of Geosciences, University of Bremen, Bremen, 28334, Germany
推荐引用方式 GB/T 7714	De Vernal A.,Hillaire-Marcel C.,Le Duc C.,et al. Natural variability of the Arctic Ocean sea ice during the present interglacial[J],2020,117(42).
APA	De Vernal A..,Hillaire-Marcel C..,Le Duc C..,Roberge P..,Brice C..,...&Stein R..(2020).Natural variability of the Arctic Ocean sea ice during the present interglacial.Proceedings of the National Academy of Sciences of the United States of America,117(42).
MLA	De Vernal A.,et al."Natural variability of the Arctic Ocean sea ice during the present interglacial".Proceedings of the National Academy of Sciences of the United States of America 117.42(2020).