(Table 1) Radiocarbon ages and different calibrated ages for sediment core HLY0503-18TC obtained during the HOTRAX expedition

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
Main Authors: Hanslik, Daniela, Jakobsson, Martin, Backman, Jan, Björck, Svante, Sellén, Emma, O'Regan, Matthew, Fornaciari, Eliana, Skog, Göran
Format: Dataset
Language:English
Published: PANGAEA 2010
Subjects:
Age
14C calibrated
14C conventional
14C milieu/reservoir corrected and calibrated
dated
dated material
dated standard deviation
Calendar age
standard deviation
DEPTH
sediment/rock
Healy
Healy-Oden Trans Arctic Expedition 2005 (HOTRAX05)
HLY0503
HLY0503-18TC
International Polar Year (2007-2008)
IPY
Lomonosov Ridge
Arctic Ocean
Method comment
Sample ID
TC
Trigger corer
Arctic
Foraminifera*
International Polar Year
Neogloboquadrina pachyderma
North Atlantic
Sea ice
Online Access:https://doi.pangaea.de/10.1594/PANGAEA.810548
https://doi.org/10.1594/PANGAEA.810548
Description
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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