(Table DR1) Accelerator mass spectrometry radiocarbon dates and calendar ages of sediments from ODP Hole 162-984C

• Main Authors: Came, Rosemarie E, Oppo, Delia W, McManus, Jerry F
• Format: Dataset
• Language: English
• Published: PANGAEA 2007
• Subjects: 162-984C; Accelerator mass spectrometry (AMS); Age; dated; dated standard deviation; Calculated; Calendar age; Depth; bottom/max; sediment/rock; top/min; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Joides Resolution; Leg162; North Atlantic Ocean; Ocean Drilling Program; ODP; Sample; optional label/labor no; Sample code/label; Sigma; Species; North Atlantic
• Online Access: https://doi.pangaea.de/10.1594/PANGAEA.721799; https://doi.org/10.1594/PANGAEA.721799

Paired planktic foraminiferal d18O and Mg/Ca data reveal trends of increasing temperatures (~3 °C) and salinities in the subpolar North Atlantic over the course of the Holocene, which were punctuated by abrupt events. The trends likely reflect an insolation-forced northward retreat of the boundary between polar and North Atlantic subsurface waters. The superimposed variability does not appear to be periodic, but tends to recur within a broad millennial band. The records provide convincing evidence of open-ocean cooling (nearly 2°C) and freshening during the 8.2 ka event, and suggest similar conditions at 9.3 ka. However, the two largest temperature oscillations in our record (~2°C) occurred during the past 4 k.y., suggesting a recent increase in temperature variability relative to the mid-Holocene, perhaps in response to neoglaciation, which began at about this time.