Biological and physical controls in the Southern Ocean on past millennial-scale atmospheric CO2 changes

Gottschalk, Julia; Skinner, Luke; Lippold, Jörg; Vogel, Hendrik; Frank, Norbert; Jaccard, Samuel; Waelbroeck, Claire (2016). Biological and physical controls in the Southern Ocean on past millennial-scale atmospheric CO2 changes. Nature communications, 7(11539), p. 11539. Nature Publishing Group 10.1038/ncomms11539

[img]
Preview
Text
Gottschalk et al., 16.pdf - Published Version
Available under License Creative Commons: Attribution (CC-BY).

Download (2MB) | Preview

Millennial-scale climate changes during the last glacial period and deglaciation were accompanied by rapid changes in atmospheric CO2 that remain unexplained. While the role of the Southern Ocean as a ’control valve’ on ocean–atmosphere CO2 exchange has been emphasized, the exact nature of this role, in particular the relative contributions of physical (for example, ocean dynamics and air–sea gas exchange) versus biological processes (for example, export productivity), remains poorly constrained. Here we combine reconstructions of bottom-water [O2], export production and 14C ventilation ages in the sub-Antarctic Atlantic, and show that atmospheric CO2 pulses during the last glacial- and deglacial periods were consistently accompanied by decreases in the biological export of carbon and increases in deep-ocean ventilation via southern-sourced water masses. These findings demonstrate how the Southern Ocean’s ’organic carbon pump’ has exerted a tight control on atmospheric CO2, and thus global climate, specifically via a synergy of both physical and biological processes.

Item Type:

Journal Article (Original Article)

Division/Institute:

10 Strategic Research Centers > Oeschger Centre for Climate Change Research (OCCR)
08 Faculty of Science > Institute of Geological Sciences

UniBE Contributor:

Gottschalk, Julia; Lippold, Jörg; Vogel, Hendrik and Jaccard, Samuel

Subjects:

500 Science > 550 Earth sciences & geology

ISSN:

2041-1723

Publisher:

Nature Publishing Group

Language:

English

Submitter:

Samuel Jaccard

Date Deposited:

20 Jun 2016 13:29

Last Modified:

26 Jun 2016 02:17

Publisher DOI:

10.1038/ncomms11539

BORIS DOI:

10.7892/boris.82543

URI:

https://boris.unibe.ch/id/eprint/82543

Actions (login required)

Edit item Edit item
Provide Feedback