edoc

Increased nutrient supply to the Southern Ocean during the Holocene and its implications for the pre-industrial atmospheric CO2 rise

Studer, Anja S. and Sigman, Daniel M. and Martinez-Garcia, Alfredo and Thole, Lena M. and Michel, Elisabeth and Jaccard, Samuel L. and Lippolds, Joerg A. and Mazaud, Alain and Wang, Xingchen T. and Robinson, Laura F. and Adkins, Jess F. and Haug, Gerald H.. (2018) Increased nutrient supply to the Southern Ocean during the Holocene and its implications for the pre-industrial atmospheric CO2 rise. NATURE GEOSCIENCE, 11 (10). pp. 756-+.

Full text not available from this repository.

Official URL: https://edoc.unibas.ch/66976/

Downloads: Statistics Overview

Abstract

A rise in the atmospheric CO2 concentration of similar to 20 parts per million over the course of the Holocene has long been recognized as exceptional among interglacials and is in need of explanation. Previous hypotheses involved natural or anthropogenic changes in terrestrial biomass, carbonate compensation in response to deglacial outgassing of oceanic CO2, and enhanced shallow water carbonate deposition. Here, we compile new and previously published fossil-bound nitrogen isotope records from the Southern Ocean that indicate a rise in surface nitrate concentration through the Holocene. When coupled with increasing or constant export production, these data suggest an acceleration of nitrate supply to the Southern Ocean surface from underlying deep water. This change would have weakened the ocean's biological pump that stores CO2 in the ocean interior, possibly explaining the Holocene atmospheric CO2 rise. Over the Holocene, the circum-North Atlantic region cooled, and the formation of North Atlantic Deep Water appears to have slowed. Thus, the 'seesaw' in deep ocean ventilation between the North Atlantic and the Southern Ocean that has been invoked for millennial-scale events, deglaciations and the last interglacial period may have also operated, albeit in a more gradual form, over the Holocene.
Faculties and Departments:05 Faculty of Science > Departement Umweltwissenschaften > Geowissenschaften > Geochemie Stoffkreisläufe (Lehmann)
UniBasel Contributors:Studer, Anja
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:NATURE PUBLISHING GROUP
ISSN:1752-0894
Note:Publication type according to Uni Basel Research Database: Journal article
Identification Number:
Last Modified:26 Apr 2020 19:10
Deposited On:26 Apr 2020 19:10

Repository Staff Only: item control page