Ventilation changes in the northeast Pacific during the last deglaciation

Publication Status is "Submitted" Or "In Press: 
LDEO Publication: 
Publication Type: 
Year of Publication: 
1996
Editor: 
Journal Title: 
Paleoceanography
Journal Date: 
Oct
Place Published: 
Tertiary Title: 
Volume: 
11
Issue: 
5
Pages: 
519-528
Section / Start page: 
Publisher: 
ISBN Number: 
0883-8305
ISSN Number: 
Edition: 
Short Title: 
Accession Number: 
ISI:A1996VU30100002
LDEO Publication Number: 
Call Number: 
Abstract: 

Under present climate conditions, convection at high latitudes of the North Pacific is restricted to shallower depths than in the North Atlantic. To what extent this asymmetry between the two ocean basins was maintained over the past 20 kyr is poorly known because there are few unambiguous proxy records of ventilation from the North Pacific. We present new data for two sediment cores from the California margin at 800 and 1600 m depth to argue that the depth of ventilation shifted repeatedly in the northeast Pacific over the course of deglaciation. The evidence includes benthic foraminiferal Cd/Ca, O-18/O-16, and C-13/C-12 data as well as radiocarbon age differences between benthic and planktonic foraminifera. A number of features in the shallower of the two cores, including an interval of laminated sediments, are consistent with changes in ventilation over the past 20 kyr suggested by alternations between laminated and bioturbated sediments in the Santa Barbara Basin and the Gulf of California [Keigwin and Jones, 1990; Kennett and Ingram, 1995; Behl and Kennett, 1996]. Data from the deeper of the two California margin cores suggest that during times of reduced ventilation at 800 m, ventilation was enhanced at 1600 m depth, and vice versa. This pronounced depth dependence of ventilation needs to be taken into account when exploring potential teleconnections between the North Pacific and the North Atlantic.

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Vu301Times Cited:32Cited References Count:47

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