气候变化领域集成服务门户(CCPortal): Evidence of abrupt climate change at 9.3 ka and 8.2 ka in the central Canadian Arctic: Connection to the North Atlantic and Atlantic Meridional Overturning Circulation

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DOI	10.1016/j.quascirev.2019.07.024
	Evidence of abrupt climate change at 9.3 ka and 8.2 ka in the central Canadian Arctic: Connection to the North Atlantic and Atlantic Meridional Overturning Circulation
	Porinchu D.F.; MacDonald G.M.; Moser K.A.; Rolland N.; Kremenetski K.; Seppä H.; Rühland K.M.
发表日期	2019
ISSN	0277-3791
起始页码	204
结束页码	217
卷号	219
英文摘要	This study presents the results of a multi-proxy analysis of a Holocene lacustrine sediment sequence recovered from a small tundra lake in the central Canadian Arctic and links climatic variations there to the North Atlantic. Chironomid and pollen-based reconstructions of mean July air temperature (MJAT) document notable deviations at 9.3 ka and 8.2 ka. Chironomid-inferred July air temperature is depressed by 1.4 °C at 9.3 ka and 1.7 °C at 8.2 ka relative to the long-term chironomid-inferred Holocene average of 9.4 °C. These cooling events also correspond to an increase in Gramineae (Poaceae) and a decrease in Betula pollen, reflecting a decrease in the density of dwarf birch cover. Concurrent, abrupt increases in several diatom taxa, including aerophilic epiphytes, and Sphagnum indicate an expansion of moss habitats as a result of wetter conditions. The expression and timing of the cooling evidenced at TK2 during the early Holocene is consistent with abrupt climate events identified in the North Atlantic and coincides with intervals of North Atlantic cooling and weakened Atlantic Meridional Overturning Circulation (AMOC). This research, which improves our understanding of the spatial extent and magnitude of the 9.3 ka and 8.2 ka events in the central Canadian Arctic, serves as a benchmark for coupled-ocean atmosphere climate models simulating the response of the climate system to abrupt climate events and provides insight in marine-atmosphere teleconnections in the circum-North Atlantic region. © 2019 Elsevier Ltd
英文关键词	AMOC; Chironomids; Diatoms; Holocene; Micropaleontology; Multi-proxy; North America; North Atlantic; Paleoclimatology; Paleolimnology; Pollen; Temperature
语种	英语
scopus关键词	Atmospheric temperature; Climate change; Climate models; Paleolimnology; Temperature; AMOC; Chironomids; Diatoms; Holocenes; Micropaleontology; Multi proxies; North America; North Atlantic; Paleoclimatology; Pollen; Oceanography; air temperature; climate change; climate variation; diatom; echinoderm; Holocene; lacustrine deposit; meridional circulation; micropaleontology; overturn; paleoclimate; paleolimnology; pollen; sedimentary sequence; Atlantic Ocean; Atlantic Ocean (North); Canada; Canadian Arctic; North America; Bacillariophyta; Betula; Betula nana; Bryophyta; Chironomidae; Poaceae; Sphagnum
来源期刊	Quaternary Science Reviews
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/151822
作者单位	Department of Geography, University of Georgia, Athens, GA 30602, United States; Departments of Geography and EEB, UCLA, Los Angeles, CA 90095, United States; Department of Geography, The University of Western Ontario, London, ON N6A 5C2, Canada; Fisheries and Oceans Canada, Moncton, NB E1C 5K4, Canada; Department of Geosciences and Geography, University of Helsinki, Finland; PEARL, Department of Biology, Queen's University, Kingston, ON K7L 3N6, Canada
推荐引用方式 GB/T 7714	Porinchu D.F.,MacDonald G.M.,Moser K.A.,et al. Evidence of abrupt climate change at 9.3 ka and 8.2 ka in the central Canadian Arctic: Connection to the North Atlantic and Atlantic Meridional Overturning Circulation[J],2019,219.
APA	Porinchu D.F..,MacDonald G.M..,Moser K.A..,Rolland N..,Kremenetski K..,...&Rühland K.M..(2019).Evidence of abrupt climate change at 9.3 ka and 8.2 ka in the central Canadian Arctic: Connection to the North Atlantic and Atlantic Meridional Overturning Circulation.Quaternary Science Reviews,219.
MLA	Porinchu D.F.,et al."Evidence of abrupt climate change at 9.3 ka and 8.2 ka in the central Canadian Arctic: Connection to the North Atlantic and Atlantic Meridional Overturning Circulation".Quaternary Science Reviews 219(2019).