Termination 1 timing in radiocarbon-dated regional benthic δ18O stacks

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doi: 10.1002/2014PA002700
Author(s): Stern, Joseph V.; Lisiecki, Lorraine E.
Author Affiliation(s): Primary:
University of California at Santa Barbara, Department of Earth Science, Santa Barbara, CA, United States
Volume Title: Paleoceanography
Source: Paleoceanography, 29(12), p.1127-1142. Publisher: American Geophysical Union, Washington, DC, United States. ISSN: 0883-8305 CODEN: POCGEP
Note: In English. NSF grants CMG-1025444 and MGG-0926735. 88 refs.; illus., incl. 2 tables, sketch map
Summary: Benthic δ18O changes are often assumed to be globally synchronous, but studies comparing 2-9 radiocarbon-dated records over the most recent deglaciation (Termination 1) have proposed differences in the timing of benthic δ18O change between the Atlantic and Pacific, intermediate and deep, and North and South Atlantic. Because of the relatively small number of records used in these previous studies, it has remained unclear whether these differences are local or regional in scale. Here we present seven regional benthic δ18O stacks for 0-40 kyr B.P. that include 252 records with independent regional age models constrained by 852 planktonic foraminiferal 14C dates from 61 of these cores. We find a 4000 year difference between the earliest termination onset in the intermediate South Atlantic at 18.5 (95% confidence interval: 17.9-19.0) kyr B.P. and the latest in the deep Indian at 14.5 (14.1-15.0) kyr B.P. The termination onset occurs at 17.5 kyr B.P. in the intermediate and deep North Atlantic, deep South Atlantic, and deep Pacific. However, throughout the termination deep North Atlantic benthic δ18O leads the deep Pacific by an average of 1000 year and a maximum of 1700 year. Additionally, the intermediate Pacific termination onset at 16.5 (16.1-16.9) kyr B.P. demonstrates that intermediate-depth benthic δ18O change was not globally synchronous. These regional stacks provide better age models than a global stack across Termination 1 and potentially important constraints on deglacial ocean circulation changes. Abstract Copyright (2014), . American Geophysical Union. All Rights Reserved.
Year of Publication: 2014
Research Program: ODP Ocean Drilling Program
Key Words: 02 Geochemistry; 03 Geochronology; 24 Surficial Geology, Quaternary Geology; Absolute age; Atlantic Ocean; Benthic taxa; C-14; Carbon; Cenozoic; Chemostratigraphy; Cores; Foraminifera; Holocene; Indian Ocean; Invertebrata; Isotope ratios; Isotopes; Leg 162; Marine environment; Marine sediments; Microfossils; North Atlantic; O-18/O-16; ODP Site 983; Ocean Drilling Program; Oxygen; Pacific Ocean; Paleoenvironment; Pleistocene; Protista; Quaternary; Radioactive isotopes; Reykjanes Ridge; Sediments; Stable isotopes; Upper Pleistocene
Coordinates: N602412 N602412 W0233826 W0233826
Record ID: 2015016314
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from John Wiley & Sons, Chichester, United Kingdom