North Atlantic versus Southern Ocean contributions to a deglacial surge in deep ocean ventilation

Skinner, L. C. and Scrivner, A. E. and Vance, D. and Barker, S. and Fallon, S. and Waelbroeck, C. (2013) North Atlantic versus Southern Ocean contributions to a deglacial surge in deep ocean ventilation. Geology, 41 (6). pp. 667-670. ISSN 0091-7613, ESSN: 1943-2682 DOI 10.1130/G34133.1

[img] PDF (This is a RoMEO white journa)
Skinner_et_al._-_2013_-_North_Atlantic_versus_Southern_Ocean_contributions.pdf
Restricted to Registered users only

Download (355kB)
Official URL: http://geology.geoscienceworld.org/content/41/6/66...

Abstract

Past glacial-interglacial climate transitions were accompanied by millennial-scale pulses in atmospheric CO2 that are widely thought to have resulted from the release of CO2 via the Southern Ocean. However, direct proxy evidence for a Southern Ocean role in regulating past ocean-atmosphere CO2 exchange is scarce. Here we use combined radiocarbon and neodymium isotope measurements from the last deglaciation to confirm greatly enhanced overturning and/or air-sea exchange rates relative to today, in particular during the Bølling-Allerød warm interval. We show that this deglacial pulse in ocean ventilation was not driven by the North Atlantic overturning alone, and must have involved an increase in the ventilation of southern-sourced deep waters. Our results thus confirm the removal of a physical and/or dynamical barrier to effective air-sea (CO2) exchange in the Southern Ocean during deglaciation, and highlight the Antarctic region as a key locus for global climate/carbon-cycle feedbacks.

Item Type: Article
Uncontrolled Keywords: 2013AREP; IA66,
Subjects: 01 - Climate Change and Earth-Ocean Atmosphere Systems
Divisions: 01 - Climate Change and Earth-Ocean Atmosphere Systems
Journal or Publication Title: Geology
Volume: 41
Page Range: pp. 667-670
Identification Number: 10.1130/G34133.1
Depositing User: Sarah Humbert
Date Deposited: 06 Jul 2013 23:10
Last Modified: 08 Aug 2013 12:25
URI: http://eprints.esc.cam.ac.uk/id/eprint/2825

Actions (login required)

View Item View Item

About cookies