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

Thienemann, Matthias; Kusch, Stephanie; Vogel, Hendrik; Ritter, Benedikt; Schefuss, Enno; Rethemeyer, Janet (2019). Neoglacial transition of atmospheric circulation patterns over Fennoscandia recorded in Holocene Lake Torneträsk sediments. Boreas, 48(2), pp. 287-298. Wiley-Blackwell 10.1111/bor.12365

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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.

Item Type:

Journal Article (Original Article)

Division/Institute:

10 Strategic Research Centers > Oeschger Centre for Climate Change Research (OCCR)
08 Faculty of Science > Institute of Geological Sciences

UniBE Contributor:

Vogel, Hendrik

Subjects:

500 Science > 550 Earth sciences & geology

ISSN:

0300-9483

Publisher:

Wiley-Blackwell

Language:

English

Submitter:

Hendrik Vogel

Date Deposited:

30 Jan 2019 10:35

Last Modified:

04 Nov 2019 10:13

Publisher DOI:

10.1111/bor.12365

BORIS DOI:

10.7892/boris.122365

URI:

https://boris.unibe.ch/id/eprint/122365

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