UCL Discovery
UCL home » Library Services » Electronic resources » UCL Discovery

Sequestration of carbon in the deep Atlantic during the last glaciation

Yu, J; Menviel, L; Jin, ZD; Thornalley, DJR; Barker, S; Marino, G; Rohling, EJ; ... Broecker, WS; + view all (2016) Sequestration of carbon in the deep Atlantic during the last glaciation. Nature Geoscience , 9 (4) pp. 319-324. 10.1038/NGEO2657. Green open access

[img]
Preview
Text
Yu_Sequestration_of_carbon.pdf - Accepted version

Download (723kB) | Preview

Abstract

Atmospheric CO2 concentrations declined markedly about 70,000 years ago, when the Earth’s climate descended into the last glaciation. Much of the carbon removed from the atmosphere has been suspected to have entered the deep oceans, but evidence for increased carbon storage remains elusive. Here we use the B/Ca ratios of benthic foraminifera from several sites across the Atlantic Ocean to reconstruct changes in the carbonate ion concentration and hence the carbon inventory of the deep Atlantic across this transition. We find that deep Atlantic carbonate ion concentration declined by around 25 μmol kg−1 between ~80,000 and 65,000 years ago. This drop implies that the deep Atlantic carbon inventory increased by at least 50 Gt around the same time as the amount of atmospheric carbon dropped by about 60 Gt. From a comparison with proxy records of deep circulation and climate model simulations, we infer that the carbon sequestration coincided with a shoaling of the Atlantic meridional overturning circulation. We thus conclude that changes in the Atlantic Ocean circulation may have played an important role in reductions of atmospheric CO2 concentrations during the last glaciation, by increasing the carbon storage in the deep Atlantic.

Type: Article
Title: Sequestration of carbon in the deep Atlantic during the last glaciation
Open access status: An open access version is available from UCL Discovery
DOI: 10.1038/NGEO2657
Publisher version: http://dx.doi.org/10.1038/NGEO2657
Language: English
Additional information: Copyright © 2016 Macmillan Publishers Limited. All rights reserved.
Keywords: Science & Technology, Physical Sciences, Geosciences, Multidisciplinary, Geology, Ocean Circulation, Atmospheric CO2, Late Quaternary, Equatorial Pacific, Interglacial Cycle, Water Composition, Southern-ocean, B/CA Ratios, Ice Volume, Temperature
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL SLASH
UCL > Provost and Vice Provost Offices > UCL SLASH > Faculty of S&HS
UCL > Provost and Vice Provost Offices > UCL SLASH > Faculty of S&HS > Dept of Geography
URI: https://discovery.ucl.ac.uk/id/eprint/1495637
Downloads since deposit
95Downloads
Download activity - last month
Download activity - last 12 months
Downloads by country - last 12 months

Archive Staff Only

View Item View Item