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

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...

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Bibliographic Details
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
Antarctic
The Antarctic
Gulf of Alaska
Greenland
Reimer
Antarc*
glaciers
Alaska
Online Access:https://dx.doi.org/10.1594/pangaea.830645
https://doi.pangaea.de/10.1594/PANGAEA.830645
Description
Summary: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. ...

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