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DOI	10.5194/cp-15-2031-2019
	A 120 000-year record of sea ice in the North Atlantic?
	Maffezzoli N.; Vallelonga P.; Edwards R.; Saiz-Lopez A.; Turetta C.; Astrid Kjær H.; Barbante C.; Vinther B.; Spolaor A.
发表日期	2019
ISSN	18149324
起始页码	2031
结束页码	2051
卷号	15 期号:6
英文摘要	Although it has been demonstrated that the speed and magnitude of the recent Arctic sea ice decline is unprecedented for the past 1450 years, few records are available to provide a paleoclimate context for Arctic sea ice extent. Bromine enrichment in ice cores has been suggested to indicate the extent of newly formed sea ice areas. Despite the similarities among sea ice indicators and ice core bromine enrichment records, uncertainties still exist regarding the quantitative linkages between bromine reactive chemistry and the first-year sea ice surfaces. Here we present a 120 000-year record of bromine enrichment from the RECAP (REnland ice CAP) ice core, coastal east Greenland, and interpret it as a record of first-year sea ice. We compare it to existing sea ice records from marine cores and tentatively reconstruct past sea ice conditions in the North Atlantic as far north as the Fram Strait (50-85° N). Our interpretation implies that during the last deglaciation, the transition from multi-year to first-year sea ice started at ~17.5 ka, synchronously with sea ice reductions observed in the eastern Nordic Seas and with the increase in North Atlantic ocean temperature. First-year sea ice reached its maximum at 12.4-11.8 ka during the Younger Dryas, after which open-water conditions started to dominate, consistent with sea ice records from the eastern Nordic Seas and the North Icelandic shelf. Our results show that over the last 120 000 years, multi-year sea ice extent was greatest during Marine Isotope Stage (MIS) 2 and possibly during MIS 4, with more extended first-year sea ice during MIS 3 and MIS 5. Sea ice extent during the Holocene (MIS 1) has been less than at any time in the last 120 000 years. © 2019 Royal Society of Chemistry. All rights reserved.
语种	英语
scopus关键词	Holocene; ice core; last deglaciation; paleoclimate; sea ice; Arctic; Arctic Ocean; Atlantic Ocean; Atlantic Ocean (North); East Greenland; Greenland; Norwegian Sea
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/146764
作者单位	Institute of Polar Sciences, ISP-CNR, Via Torino 155, Venice, 30172, Italy; Physics of Ice, Climate and Earth (PICE), Niels Bohr Institute, University of Copenhagen, Tagensvej 16, Copenhagen, 2200, Denmark; Physics and Astronomy, Curtin University of Technology, Kent St, Bentley, Perth, WA 6102, Australia; Department of Civil and Environmental Engineering, UW-Madison, Madison, WI 53706, United States; Department of Atmospheric Chemistry and Climate, Institute of Physical Chemistry Rocasolano, CSIC, Madrid, Spain; Department of Environmental Sciences, Informatics and Statistics, Ca' Foscari University of Venice, Via Torino 155, Venice, 30170, Italy
推荐引用方式 GB/T 7714	Maffezzoli N.,Vallelonga P.,Edwards R.,et al. A 120 000-year record of sea ice in the North Atlantic?[J],2019,15(6).
APA	Maffezzoli N..,Vallelonga P..,Edwards R..,Saiz-Lopez A..,Turetta C..,...&Spolaor A..(2019).A 120 000-year record of sea ice in the North Atlantic?.Climate of the Past,15(6).
MLA	Maffezzoli N.,et al."A 120 000-year record of sea ice in the North Atlantic?".Climate of the Past 15.6(2019).