Remember Me
Or use your Academic/Social account:


Or use your Academic/Social account:


You have just completed your registration at OpenAire.

Before you can login to the site, you will need to activate your account. An e-mail will be sent to you with the proper instructions.


Please note that this site is currently undergoing Beta testing.
Any new content you create is not guaranteed to be present to the final version of the site upon release.

Thank you for your patience,
OpenAire Dev Team.

Close This Message


Verify Password:
Verify E-mail:
*All Fields Are Required.
Please Verify You Are Human:
fbtwitterlinkedinvimeoflicker grey 14rssslideshare1
Howe, Jacob NW; Piotrowski, Alexander Matthew; Noble, Taryn L; Mulitza, Stefan; Chiessi, Cristiano M; Bayon, Germain (2016)
Publisher: Nature Communications
Languages: English
Types: Article
Subjects: sub-01, Article
Changes in deep ocean ventilation are commonly invoked as the primary cause of lower glacial atmospheric $CO_{2}$. The water mass structure of the glacial deep Atlantic Ocean and the mechanism by which it may have sequestered carbon remain elusive. Here we present neodymium isotope measurements from cores throughout the Atlantic that reveal glacial–interglacial changes in water mass distributions. These results demonstrate the sustained production of North Atlantic Deep Water under glacial conditions, indicating that southern-sourced waters were not as spatially extensive during the Last Glacial Maximum as previously believed. We demonstrate that the depleted glacial $\delta^{13}C$ values in the deep Atlantic Ocean cannot be explained solely by water mass source changes. A greater amount of respired carbon, therefore, must have been stored in the abyssal Atlantic during the Last Glacial Maximum. We infer that this was achieved by a sluggish deep overturning cell, comprised of well-mixed northern- and southern-sourced waters. Sample material was provided by the Godwin Laboratory for Paleoclimate Research at the University of Cambridge, the International Ocean Discovery Program, the GeoB Core Repository at the MARUM – Center for Marine Environmental Sciences, University of Bremen and Petrobras. Jo Kerr and Aurora Elmore are thanked for providing additional samples. The data reported in this paper are listed in supplementary information and archived in Pangaea (www.pangaea.de). Thiago Pereira dos Santos is thanked for providing the unpublished age model data for GL1090; Jo Clegg and Vicky Rennie are thanked for technical support and Natalie Roberts for helpful discussions. Radiocarbon analyses were supported by NERC radiocarbon grant 1752.1013 and Nd isotope analyses by NERC grant NERC NE/K005235/1 and NERC NE/F006047/1 to AMP. JNWH was supported by a Rutherford Memorial Scholarship. SM was funded through the DFG Research Center/Cluster of Excellence “The Ocean in the Earth System”. CMC acknowledges financial support from FAPESP (Grant 2012/17517-3). This is the author accepted manuscript. It is currently under an indefinite embargo pending publication by Nature Publishing Group.

Share - Bookmark

Funded by projects

Cite this article