Journal ArticleDOI
Late-glacial climatic oscillation in Atlantic Canada equivalent to the Allerød/younger Dryas event
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In this paper, the evidence for a climatic event in Atlantic Canda was presented, which involved a warming trend before 11,000 yr BP that was interrupted by a cold period which persisted until the abrupt Holocene warming at ∼10, 000 yr BP.Abstract:
Attempts1–5 to relate late-glacial events in northeastern North America to the well-documented climato- and chrono-stratigraphy of Europe and the British Isles6 have not been considered convincing because the evidence presented was from isolated sites, and could therefore be interpreted as local fluctuations not related to a general, widespread climatic change7–10. However, recent palyno-logical studies in northeastern North America postulating a late-glacial climatic oscillation11–15 have caused renewed interest in relating such an oscillation to the Allerod/younger Dryas event. We have extended our preliminary results from Nova Scotia and New Brunswick13,14, and here present the evidence for a climatic event in Atlantic Canda. This event involved a warming trend before 11,000 yr BP that was interrupted by a cold period which persisted until the abrupt Holocene warming at ∼10,000 yr BP. We propose a possible mechanism to link this event with that of Europe.read more
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Book ChapterDOI
An outline of North American deglaciation with emphasis on central and northern Canada
TL;DR: In this paper, the authors present revised maps of North American deglaciation at 500-year and finer resolution, which represent an updating of a series prepared nearly two decades ago for the INQUA 1987 Congress.
Journal ArticleDOI
An event stratigraphy for the Last Termination in the North Atlantic region based on the Greenland ice-core record: a proposal by the INTIMATE group
Svante Björck,Michael Walker,Les C. Cwynar,Sigfus J Johnsen,Karen Luise Knudsen,J. John Lowe,Barbara Wohlfarth +6 more
TL;DR: Based on the oxygen isotope signal in the GRIP Greenland ice core, a new event stratigraphy spanning the time interval from ca. 22.0 to 11.5 k GRIP yr BP (ca. 19.0-10.0 k 14 C yr BP) is proposed for the North Atlantic region as mentioned in this paper.
Journal ArticleDOI
Formal definition and dating of the GSSP (Global Stratotype Section and Point) for the base of the Holocene using the Greenland NGRIP ice core, and selected auxiliary records
Michael Walker,Sigfus J Johnsen,Sune Olander Rasmussen,Trevor Popp,Trevor Popp,J. P. Steffensen,Philip L. Gibbard,Wim Z. Hoek,J. John Lowe,John T. Andrews,Svante Björck,Les C. Cwynar,Konrad A Hughen,Peter Kershaw,Bernd Kromer,Thomas Litt,David J. Lowe,Takeshi Nakagawa,Rewi M. Newnham,Jakob Schwander +19 more
TL;DR: The Greenland ice core from NorthGRIP (NGRIP) contains a proxy climate record across the Pleistocene-Holocene boundary of unprecedented clarity and resolution, which enables the base of the Holocene, as reflected in the first signs of climatic warming at the end of the Younger Dryas/Greenland Stadial 1 cold phase, to be located with a high degree of precision as discussed by the authors.
Journal ArticleDOI
Potential effects of climate changes on aquatic systems: laurentian great lakes and precambrian shield region
John J. Magnuson,Katherine E. Webster,Katherine E. Webster,Raymond A. Assel,Carl J. Bowser,Peter J. Dillon,J. G. Eaton,H. E. Evans,E. J. Fee,Roland I. Hall,L. R. Mortsch,David W. Schindler,Frank H. Quinn +12 more
TL;DR: In this article, the Laurentian Great Lakes and a diversity of smaller glacial lakes, streams and wetlands south of permanent permafrost and towards the southern extent of Wisconsin glaciation were studied.
Journal ArticleDOI
Late‐glacial climatic oscillations as recorded in Swiss lake sediments
TL;DR: In this paper, regional pollen assemblage zones for the late-glacial period of the Swiss Plateau are introduced and defined, which include four major zones (Artemisia, Juniperus, Hippophae, Betula, Pinus PAZ) with several subzones.
References
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Journal ArticleDOI
Does the ocean–atmosphere system have more than one stable mode of operation?
TL;DR: In this article, the climate record obtained from two long Greenland ice cores reveals several brief climate oscillations during glacial time and suggests that these oscillations are caused by fluctuations in the formation rate of deep water in the northern Atlantic.
Journal ArticleDOI
Holocene climatic variations—Their pattern and possible cause
George H. Denton,Wibjörn Karlén +1 more
TL;DR: In the St. Elias Mountains in southern Yukon Territory and Alaska, C14-dated fluctuations of 14 glacier termini show two major intervals of Holocene glacier expansion, the older dating from 3300-2400 calendar yr BP and the younger corresponding to the Little Ice Age of the last several centuries.
Journal ArticleDOI
The North Atlantic Ocean during the last deglaciation
TL;DR: The last deglacial warming of the high-latitude North Atlantic Ocean (40°65°) occurred in three discrete steps: in the southeast and central regions at 13 000 B.P., in the central and northern sectors at 10 000 B., and in the western (Labrador Sea) sector between 9000 and 6500 B., with a major influx of products of glacial wastage (meltwater and icebergs) as mentioned in this paper.
Journal ArticleDOI
A Younger Dryas Ash Bed in western Norway, and its possible correlations with tephra in cores from the Norwegian Sea and the North Atlantic
TL;DR: A bed of volcanic ash up to 23 cm thick is found in lacustrine and marine sediments in western Norway as mentioned in this paper, which is formally mamed the Vedde Ash Bed, and its age is approximately 10,600 yr B.P., i.e., mid-Younger Dryas.