Rapid early-Holocene environmental changes in northern Sweden based on studies of two varved lake-sediment sequences
Mineral magnetic, organic carbon and pollen studies of two varved Holocene lake-sediment sequences in the boreal forest of northern Sweden indicate that signi” cant environmental changes took place between c. 6000 and 5700 bc. This interval is characterized by an increase in mineral-matter accumulat...
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Online Access: | http://dx.doi.org/10.1191/0959683602hl515rp http://journals.sagepub.com/doi/pdf/10.1191/0959683602hl515rp |
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crsagepubl:10.1191/0959683602hl515rp 2024-04-21T08:03:52+00:00 Rapid early-Holocene environmental changes in northern Sweden based on studies of two varved lake-sediment sequences Snowball, Ian Zillén, Lovisa Gaillard, Marie-José 2002 http://dx.doi.org/10.1191/0959683602hl515rp http://journals.sagepub.com/doi/pdf/10.1191/0959683602hl515rp en eng SAGE Publications http://journals.sagepub.com/page/policies/text-and-data-mining-license The Holocene volume 12, issue 1, page 7-16 ISSN 0959-6836 1477-0911 Paleontology Earth-Surface Processes Ecology Archeology Global and Planetary Change journal-article 2002 crsagepubl https://doi.org/10.1191/0959683602hl515rp 2024-04-09T08:02:31Z Mineral magnetic, organic carbon and pollen studies of two varved Holocene lake-sediment sequences in the boreal forest of northern Sweden indicate that signi” cant environmental changes took place between c. 6000 and 5700 bc. This interval is characterized by an increase in mineral-matter accumulation, which is a proxy for winter-snow accumulation, and a statistically signi” cant decrease in total pollen in‘ ux (predominantly Pinus, Betula and Alnus), which may re‘ ect lower spring and summer temperatures and increased frost frequency. Notable increases in the in‘ ux of deciduous tree species (including Quercus and Corylus) suggest a rapid change to warmer conditions between 5700 and 5600 bc. Given dating errors associated with the varve chronologies and the Greenland ice-core timescales, the cold interval can be considered to re‘ ect a regional (possibly global) climatic cooling, which is often referred to as the ‘8.2 kyr BP cooling event’. However, the younger age of the cold event in northern Sweden does not support the hypothesis of forcing by the sudden drainage of Laurentide glacial lakes into the North Atlantic, unless a minimal 300-year delay in ocean-atmospheric coupling is accepted. The data contribute to a complex picture of early-Holocene environmental change, in response to deglaciation of the Northern Hemisphere. Article in Journal/Newspaper Greenland Greenland ice core ice core North Atlantic Northern Sweden SAGE Publications The Holocene 12 1 7 16 |
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Open Polar |
collection |
SAGE Publications |
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crsagepubl |
language |
English |
topic |
Paleontology Earth-Surface Processes Ecology Archeology Global and Planetary Change |
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Paleontology Earth-Surface Processes Ecology Archeology Global and Planetary Change Snowball, Ian Zillén, Lovisa Gaillard, Marie-José Rapid early-Holocene environmental changes in northern Sweden based on studies of two varved lake-sediment sequences |
topic_facet |
Paleontology Earth-Surface Processes Ecology Archeology Global and Planetary Change |
description |
Mineral magnetic, organic carbon and pollen studies of two varved Holocene lake-sediment sequences in the boreal forest of northern Sweden indicate that signi” cant environmental changes took place between c. 6000 and 5700 bc. This interval is characterized by an increase in mineral-matter accumulation, which is a proxy for winter-snow accumulation, and a statistically signi” cant decrease in total pollen in‘ ux (predominantly Pinus, Betula and Alnus), which may re‘ ect lower spring and summer temperatures and increased frost frequency. Notable increases in the in‘ ux of deciduous tree species (including Quercus and Corylus) suggest a rapid change to warmer conditions between 5700 and 5600 bc. Given dating errors associated with the varve chronologies and the Greenland ice-core timescales, the cold interval can be considered to re‘ ect a regional (possibly global) climatic cooling, which is often referred to as the ‘8.2 kyr BP cooling event’. However, the younger age of the cold event in northern Sweden does not support the hypothesis of forcing by the sudden drainage of Laurentide glacial lakes into the North Atlantic, unless a minimal 300-year delay in ocean-atmospheric coupling is accepted. The data contribute to a complex picture of early-Holocene environmental change, in response to deglaciation of the Northern Hemisphere. |
format |
Article in Journal/Newspaper |
author |
Snowball, Ian Zillén, Lovisa Gaillard, Marie-José |
author_facet |
Snowball, Ian Zillén, Lovisa Gaillard, Marie-José |
author_sort |
Snowball, Ian |
title |
Rapid early-Holocene environmental changes in northern Sweden based on studies of two varved lake-sediment sequences |
title_short |
Rapid early-Holocene environmental changes in northern Sweden based on studies of two varved lake-sediment sequences |
title_full |
Rapid early-Holocene environmental changes in northern Sweden based on studies of two varved lake-sediment sequences |
title_fullStr |
Rapid early-Holocene environmental changes in northern Sweden based on studies of two varved lake-sediment sequences |
title_full_unstemmed |
Rapid early-Holocene environmental changes in northern Sweden based on studies of two varved lake-sediment sequences |
title_sort |
rapid early-holocene environmental changes in northern sweden based on studies of two varved lake-sediment sequences |
publisher |
SAGE Publications |
publishDate |
2002 |
url |
http://dx.doi.org/10.1191/0959683602hl515rp http://journals.sagepub.com/doi/pdf/10.1191/0959683602hl515rp |
genre |
Greenland Greenland ice core ice core North Atlantic Northern Sweden |
genre_facet |
Greenland Greenland ice core ice core North Atlantic Northern Sweden |
op_source |
The Holocene volume 12, issue 1, page 7-16 ISSN 0959-6836 1477-0911 |
op_rights |
http://journals.sagepub.com/page/policies/text-and-data-mining-license |
op_doi |
https://doi.org/10.1191/0959683602hl515rp |
container_title |
The Holocene |
container_volume |
12 |
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1 |
container_start_page |
7 |
op_container_end_page |
16 |
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1796943553247576064 |