Citation:

2014PA002700

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Abstract:

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.

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	Comment
1	AGE	Age	ka BP	Stern, Joseph V	Geocode
2	δ18O	δ18O	‰	Stern, Joseph V	Intermediate North Atlantic stack
3	Number of points	Points	#	Stern, Joseph V	Intermediate North Atlantic, number of points in stacked interval
4	δ18O, standard error	δ18O std e	±	Stern, Joseph V	Intermediate North Atlantic, standard error for stacked d18O
5	δ18O	δ18O	‰	Stern, Joseph V	Deep North Atlantic stack
6	Number of points	Points	#	Stern, Joseph V	Deep North Atlantic, number of points in stacked interval
7	δ18O, standard error	δ18O std e	±	Stern, Joseph V	Deep North Atlantic, standard error for stacked d18O
8	δ18O	δ18O	‰	Stern, Joseph V	Intermediate South Atlantic stack
9	Number of points	Points	#	Stern, Joseph V	Intermediate South Atlantic, number of points in stacked interval
10	δ18O, standard error	δ18O std e	±	Stern, Joseph V	Intermediate South Atlantic, standard error for stacked d18O
11	δ18O	δ18O	‰	Stern, Joseph V	Deep South Atlantic stack
12	Number of points	Points	#	Stern, Joseph V	Deep South Atlantic, number of points in stacked interval
13	δ18O, standard error	δ18O std e	±	Stern, Joseph V	Deep South Atlantic, standard error for stacked d18O
14	δ18O	δ18O	‰	Stern, Joseph V	Intermediate Pacific stack
15	Number of points	Points	#	Stern, Joseph V	Intermediate Pacific, number of points in stacked interval
16	δ18O, standard error	δ18O std e	±	Stern, Joseph V	Intermediate Pacific, standard error for stacked d18O
17	δ18O	δ18O	‰	Stern, Joseph V	Deep Pacific stack
18	Number of points	Points	#	Stern, Joseph V	Deep Pacific, number of points in stacked interval
19	δ18O, standard error	δ18O std e	±	Stern, Joseph V	Deep Pacific, standard error for stacked d18O
20	δ18O	δ18O	‰	Stern, Joseph V	Deep Indian stack
21	Number of points	Points	#	Stern, Joseph V	Deep Indian, number of points in stacked interval
22	δ18O, standard error	δ18O std e	±	Stern, Joseph V	Deep Indian, standard error for stacked d18O

License:

Creative Commons Attribution 3.0 Unported (CC-BY-3.0)

Size:

1794 data points

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