(Table 1) Age determination of North Atlantic sediment cores ...

• Main Authors: Keigwin, Lloyd D, Sachs, Julian P, Rosenthal, Yair, Boyle, Edward A
• Format: Dataset
• Language: English
• Published: PANGAEA 2005
• Subjects: Event label; Latitude of event; Longitude of event; Elevation of event; DEPTH, sediment/rock; Age, dated material; Age, dated; Age, dated standard error; Laboratory code/label; Calendar age; Age, maximum/old; Age, minimum/young; Piston corer; Trigger corer; Giant gravity corer; MultiCorer; Age, 14C AMS; Hudson; Hudson Strait; North Atlantic; Planktonic foraminifera
• Online Access: https://dx.doi.org/10.1594/pangaea.837084; https://doi.pangaea.de/10.1594/PANGAEA.837084

Stable isotope, trace metal, alkenone paleothermometry, and radiocarbon methods have been applied to sediment cores in the western subpolar North Atlantic between Hudson Strait and Cape Hatteras to reveal the history of climate in that region over the past ~11 kyr. We focus on cores from the Laurentian Fan, which is known to have rapid and continuous accumulation of hemipelagic sediment. Although results among our various proxy data are not always in agreement, the weight of the evidence (alkenone sea surface temperature (SST), d18O and abundance of Globigerinoides ruber) indicates a continual cooling of surface waters over Laurentian Fan, from about 18°C in the early Holocene to about 8°C today. Alternatively, Mg/Ca data on planktonic foraminifera indicate no systematic change in Holocene SST. The inferred long-term decrease in SST was probably driven by decreasing seasonality of Northern Hemisphere insolation. Two series of proxy data show the gradual cooling was interrupted by a two-step cold pulse that ... : Including data of Keigwin and Pickart (1999) on OCE326-MC13 and OCE326-MC25. ...