Quaternary Arctic Ocean sea ice variations and radiocarbon reservoir age corrections

A short sediment core from a local depression forming an intra basin on the Lomonosov Ridge, was retrieved during the Healy-Oden Trans-Arctic Expedition 2005 (HOTRAX). It contains a record of the Marine Isotope Stages (MIS) 1-3 showing exceptionally high abundances of calcareous microfossils during...

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Bibliographic Details
Published in:Quaternary Science Reviews
Main Authors: HANSLIK D, JAKOBSSON M, BACKMAN J, BJÖRCK S, SELLÉN E, O'REGAN M, SKOG G., FORNACIARI, ELIANA
Other Authors: Hanslik, D, Jakobsson, M, Backman, J, Björck, S, Sellén, E, O'Regan, M, Fornaciari, Eliana, Skog, G.
Format: Article in Journal/Newspaper
Language:English
Published: 2010
Subjects:
NORTH-ATLANTIC
PLANKTIC FORAMINIFERS
LAST DEGLACIATION
SURFACE SEDIMENTS
LATE PLEISTOCENE
Arctic Ocean
Foraminifera*
Lomonosov Ridge
Neogloboquadrina pachyderma
North Atlantic
Sea ice
Online Access:http://hdl.handle.net/11577/2424405
https://doi.org/10.1016/j.quascirev.2010.06.011
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Summary:A short sediment core from a local depression forming an intra basin on the Lomonosov Ridge, was retrieved during the Healy-Oden Trans-Arctic Expedition 2005 (HOTRAX). It contains a record of the Marine Isotope Stages (MIS) 1-3 showing exceptionally high abundances of calcareous microfossils during parts of MIS 3. Based on radiocarbon dating, linear sedimentation rates of 7-9 cm/ka persist during the last deglaciation. The Last Glacial Maximum (LGM) is partly characterized by a hiatus. Planktic foraminiferal abundance variations of Neogloboquadrina pachyderma sinistral and calcareous nannofossils reflect changes in Arctic Ocean summer sea ice coverage and probably inflow of subpolar North Atlantic water. Calibration of the radiocarbon ages, using modeled reservoir corrections from previous studies and the microfossil abundance record of the studied core, results in marine reservoir ages of 1400 years or more, at least during the last deglaciation. Paired benthic-planktic radiocarbon dated foraminiferal samples indicate a slow decrease in age difference between surface and bottom waters from the Lateglacial to the Holocene, suggesting circulation and ventilation changes.

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