(Table S1) Age determination of sediment cores of the Gulf of Alaska ...

• Main Authors: Davies, M H, Mix, Alan C, Stoner, Joseph S, Addison, Jason A, Jaeger, John, Finney, Bruce P, Wiest, Johannes
• Format: Dataset
• Language: English
• Published: PANGAEA 2011
• Subjects: Event label; DEPTH, sediment/rock; Depth, composite; Age, dated; Age, dated standard deviation; Calendar age; Calendar age, standard deviation; Jumbo Piston Core; MultiCorer; Trigger corer; Intercore correlation; Age, 14C AMS; Age, 14C calibrated, CALIB Stuiver & Reimer, 1993; Antarc*; Antarctic; glaciers; Greenland; Alaska
• Online Access: https://dx.doi.org/10.1594/pangaea.830645; https://doi.pangaea.de/10.1594/PANGAEA.830645

Oxygen isotope data from planktonic and benthic foraminifera, on a high-resolution age model (44 14C dates spanning 17,400 years), document deglacial environmental change on the southeast Alaska margin (59°33.32'N, 144°9.21'W, 682 m water depth). Surface freshening (i.e., d18O reduction of 0.8 per mil) began at 16,650 ± 170 cal years B.P. during an interval of ice proximal sedimentation, likely due to freshwater input from melting glaciers. A sharp transition to laminated hemipelagic sediments constrains retreat of regional outlet glaciers onto land circa 14,790 ± 380 cal years B.P. Abrupt warming and/or freshening of the surface ocean (i.e., additional d18O reduction of 0.9 per mil) coincides with the Bølling Interstade of northern Europe and Greenland. Cooling and/or higher salinities returned during the Allerød interval, coincident with the Antarctic Cold Reversal, and continue until 11,740 ± 200 cal years B.P., when onset of warming coincides with the end of the Younger Dryas. An abrupt 1 per mil ... : Calendar years calculated from mean planktonic 14C ages for JC and TC samples and benthic 14C ages for MC samples, using CALIB v.6.0 [Stuiver and Reimer, 1993] with the Marine09 calibration curve. For planktonic samples (JC and TC) Delta R = 470 ± 80 years, and for benthic samples (MC) Delta R = 900 ± 100. ...