Publication Date:
2024-03-02
Description:
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.
Keywords:
162-984C; Accelerator mass spectrometry (AMS); Age, dated; Age, dated standard deviation; Calculated; Calendar age; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Joides Resolution; Leg162; Ocean Drilling Program; ODP; Sample, optional label/labor no; Sample code/label; Sigma; South Atlantic Ocean; Species
Type:
Dataset
Format:
text/tab-separated-values, 231 data points
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