Causes and consequences of Arctic freshwater routing into the Nordic Seas during late Marine Isotope Stage 5.

Telesinski, Maciej M., Bauch, Henning A. and Spielhagen, Robert F. (2018) Causes and consequences of Arctic freshwater routing into the Nordic Seas during late Marine Isotope Stage 5. Journal of Quaternary Science, 33 (7). pp. 794-803. DOI 10.1002/jqs.3060.

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Abstract

Sediment core PS1904 reveals continuous records of planktic and benthic foraminiferal stable isotopes (δ18O/δ13C) from the north-eastern Greenland continental margin. The data show good comparability with other records from the Nordic Seas, allowing the stratigraphic range of PS1904 to be dated to Marine Isotope Stage (MIS) 6. Focusing on MIS 5 reveals light δ18O values during MIS 5a compared to the last interglacial peak (MIS 5e) which indicates that surface and bottom water layers were strongly affected by freshwater during the former event. We present two possible scenarios explaining the origin and routing of the freshwater: (i) drainage of a Eurasian proglacial lake coupled with the collapse of the Kara Sea Ice Sheet at the MIS 5b/a boundary, and (ii) destabilization and melting of the nearby Greenland Ice Sheet. Although both scenarios could have acted simultaneously, sediment records from the Eurasian sector of the Arctic Ocean hint at the proglacial lake system in north-western Siberia as the largest freshwater source. Regardless of the actual source, the freshwater lowered the surface ocean salinity causing water column stratification and sea ice expansion. Increased sea-ice abundance led to a higher albedo and probably contributed to the cooling and global ice sheet growth that occurred subsequently during MIS 4.

Document Type: Article
Additional Information: Correction in Vol. 33 (8): p.977: In the paper of Telesiński et. al., the current affiliation of the author Maciej M. Telesiński is incorrectly listed as a footnote in the article. Authors and their affiliation should appear as: Maciej M. Telesiński1,4, Henning A. Bauch2, and Robert F. Spielhagen3 1Academy of Sciences, Humanities and Literature, Mainz, Germany 2Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Bremerhaven, Germany 3GEOMAR Helmholtz Centre for Ocean Research, Kiel, Germany 4Institute of Oceanology, Polish Academy of Sciences, Powstańców Warszawy 55, 81‐712 Sopot, Poland.
Keywords: freshwater outburst, late Pleistocene, MIS 5a, Nordic Seas, stable isotopes
Research affiliation: OceanRep > GEOMAR > FB1 Ocean Circulation and Climate Dynamics > FB1-P-OZ Paleo-Oceanography
AWI
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1002/jqs.3060
ISSN: 0267-8179
Projects: Transdrift
Date Deposited: 10 Sep 2018 07:10
Last Modified: 01 Feb 2019 15:16
URI: http://oceanrep.geomar.de/id/eprint/44179

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