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

• 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

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.