Neoglacial transition of atmospheric circulation patterns over Fennoscandia recorded in Holocene Lake Torneträsk sediments

Atmospheric circulation over the North Atlantic has undergone significant fluctuations during the Holocene. To better constrain these changes and their impacts on the Fennoscandian subarctic, we investigated molecular and inorganic proxies as well as plant wax D/H isotopes (δDC28) in a Holocene sed...

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Bibliographic Details
Published in:Boreas
Main Authors: Thienemann, Matthias, Kusch, Stephanie, Vogel, Hendrik, Ritter, Benedikt, Schefuss, Enno, Rethemeyer, Janet
Format: Article in Journal/Newspaper
Language:English
Published: Wiley-Blackwell 2019
Subjects:
550 Earth sciences & geology
Arctic
Arctic Ocean
Torneträsk
Fennoscandia
Fennoscandian
North Atlantic
Subarctic
Online Access:https://boris.unibe.ch/122365/1/Thienemann_et_al-2018-Boreas.pdf
https://boris.unibe.ch/122365/
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Summary:Atmospheric circulation over the North Atlantic has undergone significant fluctuations during the Holocene. To better constrain these changes and their impacts on the Fennoscandian subarctic, we investigated molecular and inorganic proxies as well as plant wax D/H isotopes (δDC28) in a Holocene sedimentary record from Lake Torneträsk (Sweden). These data indicate a thermal maximum c. 8100 to 6300 cal. a BP with reduced soil organic matter input, followed by a long-term cooling trend with increasing soil erosion. δD data suggest a stable atmospheric circulation with predominance of westerly flow and North Atlantic moisture sourcing during the Early and Middle Holocene. A substantial depletion in δD followed by increased flood frequency starting at c. 5300 cal. a BP and intensifying c. 1500 cal. a BP suggests a reorganization of the atmospheric circulation from zonal towards meridional flow with predominantly Arctic Ocean and Baltic Sea moisture sourcing.

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