The Preboreal oscillation around the Nordic Seas: terrestrial and lacustrine responses
The occurrence of an early Preboreal climatic cooling/oscillation (PBO) in lacustrine and glacial records from northwest Europe, Iceland and Greenland is reviewed and documented. The often subtle response of the proxy records to this oscillation, in combination with its short duration, make it diffi...
Main Authors: | , , , |
---|---|
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
1997
|
Subjects: | |
Online Access: | https://curis.ku.dk/portal/da/publications/the-preboreal-oscillation-around-the-nordic-seas-terrestrial-and-lacustrine-responses(3261f98b-7858-4c5c-93b1-b7e9ed85317f).html |
id |
ftcopenhagenunip:oai:pure.atira.dk:publications/3261f98b-7858-4c5c-93b1-b7e9ed85317f |
---|---|
record_format |
openpolar |
spelling |
ftcopenhagenunip:oai:pure.atira.dk:publications/3261f98b-7858-4c5c-93b1-b7e9ed85317f 2024-05-19T07:41:19+00:00 The Preboreal oscillation around the Nordic Seas: terrestrial and lacustrine responses Börck, Svante Rundgren, Mats Ingolfsson, Olafur Funder, Svend Visby 1997 https://curis.ku.dk/portal/da/publications/the-preboreal-oscillation-around-the-nordic-seas-terrestrial-and-lacustrine-responses(3261f98b-7858-4c5c-93b1-b7e9ed85317f).html eng eng info:eu-repo/semantics/restrictedAccess Börck , S , Rundgren , M , Ingolfsson , O & Funder , S V 1997 , ' The Preboreal oscillation around the Nordic Seas: terrestrial and lacustrine responses ' , Journal of Quaternary Science , vol. 12 , pp. 455-465 . article 1997 ftcopenhagenunip 2024-05-02T00:33:07Z The occurrence of an early Preboreal climatic cooling/oscillation (PBO) in lacustrine and glacial records from northwest Europe, Iceland and Greenland is reviewed and documented. The often subtle response of the proxy records to this oscillation, in combination with its short duration, make it difficult to detect. Owing to its chronostratigraphic position between the 10 000–9900 and 9600–9500 14C plateaux (c. 11 300–11 150 calendar yr BP) it is also difficult to 14C date with precision. We find that the vegetation response to the PBO varies between sites and regions. In contrast to the pioneer vegetation in Iceland and southern Sweden, the expanding birch–pine forest in Germany–Denmark was more susceptible to deteriorating growing conditions. The combined lacustrine, tree-ring and glacial records imply that the PBO was characterised by cool and humid conditions throughout northwestern and central Europe. This is documented by vegetation changes, decreased aquatic production, increased soil erosion, increased 2H and 13C content in tree-rings, readvances or stillstands of the ice sheet in Norway and Finland, and ingression of brackish water into the Baltic. Icelandic proxy records from lake sediments and glacial moraines imply cooler conditions than during the previous Preboreal period, but not as extreme as during the Younger Dryas. Greenland records suggest that the early Preboreal was characterised by ice readvances, as an effect of cool climate and increased precipitation (in relation to the Younger Dryas). It was not until the end of the PBO that climate was warm enough to melt the land-based ice sheet. This Preboreal oscillation, found on both sides of the Nordic Seas, is interpreted as an effect of increased freshwater forcing on the thermohaline circulation in the Nordic Seas, which is implied by a simultaneous and distinct rise in the atmospheric 14C/12C ratio. A slow-down of the thermohaline circulation may temporarily have pushed the Polar Front further south Article in Journal/Newspaper Greenland Ice Sheet Iceland Nordic Seas University of Copenhagen: Research |
institution |
Open Polar |
collection |
University of Copenhagen: Research |
op_collection_id |
ftcopenhagenunip |
language |
English |
description |
The occurrence of an early Preboreal climatic cooling/oscillation (PBO) in lacustrine and glacial records from northwest Europe, Iceland and Greenland is reviewed and documented. The often subtle response of the proxy records to this oscillation, in combination with its short duration, make it difficult to detect. Owing to its chronostratigraphic position between the 10 000–9900 and 9600–9500 14C plateaux (c. 11 300–11 150 calendar yr BP) it is also difficult to 14C date with precision. We find that the vegetation response to the PBO varies between sites and regions. In contrast to the pioneer vegetation in Iceland and southern Sweden, the expanding birch–pine forest in Germany–Denmark was more susceptible to deteriorating growing conditions. The combined lacustrine, tree-ring and glacial records imply that the PBO was characterised by cool and humid conditions throughout northwestern and central Europe. This is documented by vegetation changes, decreased aquatic production, increased soil erosion, increased 2H and 13C content in tree-rings, readvances or stillstands of the ice sheet in Norway and Finland, and ingression of brackish water into the Baltic. Icelandic proxy records from lake sediments and glacial moraines imply cooler conditions than during the previous Preboreal period, but not as extreme as during the Younger Dryas. Greenland records suggest that the early Preboreal was characterised by ice readvances, as an effect of cool climate and increased precipitation (in relation to the Younger Dryas). It was not until the end of the PBO that climate was warm enough to melt the land-based ice sheet. This Preboreal oscillation, found on both sides of the Nordic Seas, is interpreted as an effect of increased freshwater forcing on the thermohaline circulation in the Nordic Seas, which is implied by a simultaneous and distinct rise in the atmospheric 14C/12C ratio. A slow-down of the thermohaline circulation may temporarily have pushed the Polar Front further south |
format |
Article in Journal/Newspaper |
author |
Börck, Svante Rundgren, Mats Ingolfsson, Olafur Funder, Svend Visby |
spellingShingle |
Börck, Svante Rundgren, Mats Ingolfsson, Olafur Funder, Svend Visby The Preboreal oscillation around the Nordic Seas: terrestrial and lacustrine responses |
author_facet |
Börck, Svante Rundgren, Mats Ingolfsson, Olafur Funder, Svend Visby |
author_sort |
Börck, Svante |
title |
The Preboreal oscillation around the Nordic Seas: terrestrial and lacustrine responses |
title_short |
The Preboreal oscillation around the Nordic Seas: terrestrial and lacustrine responses |
title_full |
The Preboreal oscillation around the Nordic Seas: terrestrial and lacustrine responses |
title_fullStr |
The Preboreal oscillation around the Nordic Seas: terrestrial and lacustrine responses |
title_full_unstemmed |
The Preboreal oscillation around the Nordic Seas: terrestrial and lacustrine responses |
title_sort |
preboreal oscillation around the nordic seas: terrestrial and lacustrine responses |
publishDate |
1997 |
url |
https://curis.ku.dk/portal/da/publications/the-preboreal-oscillation-around-the-nordic-seas-terrestrial-and-lacustrine-responses(3261f98b-7858-4c5c-93b1-b7e9ed85317f).html |
genre |
Greenland Ice Sheet Iceland Nordic Seas |
genre_facet |
Greenland Ice Sheet Iceland Nordic Seas |
op_source |
Börck , S , Rundgren , M , Ingolfsson , O & Funder , S V 1997 , ' The Preboreal oscillation around the Nordic Seas: terrestrial and lacustrine responses ' , Journal of Quaternary Science , vol. 12 , pp. 455-465 . |
op_rights |
info:eu-repo/semantics/restrictedAccess |
_version_ |
1799480912902094848 |