Rapid climatic changes during the Greenland stadial 1 (Younger Dryas) to early Holocene transition on the Norwegian Barents Sea coast
A pollen-based quantitative climate reconstruction from a lake-sediment core on the Norwegian Barents Sea coast provides insights about climatic change over the Greenland stadial 1 (GS-1) to early-Holocene transition. GS-1 was characterized by low July mean temperatures (c. 6.0 degree C) and dry con...
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Published in | Boreas Vol. 31; no. 3; pp. 215 - 225 |
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Main Authors | , , |
Format | Journal Article |
Language | English |
Published |
01.09.2002
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Subjects | |
Online Access | Get full text |
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Summary: | A pollen-based quantitative climate reconstruction from a lake-sediment core on the Norwegian Barents Sea coast provides insights about climatic change over the Greenland stadial 1 (GS-1) to early-Holocene transition. GS-1 was characterized by low July mean temperatures (c. 6.0 degree C) and dry conditions probably resembling modern arctic deserts. The increase in July mean temperatures to the Holocene level (10.0-12.0 degree C) took place in a two-step pattern interrupted by a short cool period with July mean temperatures of c. 8.0 degree C during the early Preboreal at c. 11450-11200 cal. yr BP. The reconstruction also suggests two other early-Holocene coolings of c. 1.5 degree C dating to 10900-10800 cal. yr BP and 10400-10200 cal. yr BP, synchronously with short-term decreases in delta super(18)O values in the Greenland ice cores. These results reflect the highly unstable nature of the early-Holocene climate in northernmost Fennoscandia. Apart from the cooling at 10900-10800 cal. yr BP, the reconstructed cold events correlate with fluxes of fresh water to the North Atlantic and related reductions of North Atlantic deep-water formation, suggesting that the rapid climate changes resulted from the dynamics of the North Atlantic thermohaline circulation and oceanic energy transport during the GS-1 to early-Holocene transition. |
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Bibliography: | ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 |
ISSN: | 0300-9483 |
DOI: | 10.1080/030094802760260337 |