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

Ocean warming, not acidification, controlled coccolithophore response during past greenhouse climate change

Gibbs, SJ; Bown, PR; Ridgwell, A; Young, JR; Poulton, AJ; O'Dea, SA; (2015) Ocean warming, not acidification, controlled coccolithophore response during past greenhouse climate change. Geology , 44 (1) pp. 59-62. 10.1130/G37273.1. Green open access

[img]
Preview
Text
Bown_Gibbs%2B2016.pdf - Published version

Download (335kB) | Preview

Abstract

Current carbon dioxide emissions are an assumed threat to oceanic calcifying plankton (coccolithophores) not just due to rising sea-surface temperatures, but also because of ocean acidification (OA). This assessment is based on single species culture experiments that are now revealing complex, synergistic, and adaptive responses to such environmental change. Despite this complexity, there is still a widespread perception that coccolithophore calcification will be inhibited by OA. These plankton have an excellent fossil record, and so we can test for the impact of OA during geological carbon cycle events, providing the added advantages of exploring entire communities across real-world major climate perturbation and recovery. Here we target fossil coccolithophore groups (holococcoliths and braarudosphaerids) expected to exhibit greatest sensitivity to acidification because of their reliance on extracellular calcification. Across the Paleocene-Eocene Thermal Maximum (56 Ma) rapid warming event, the biogeography and abundance of these extracellular calcifiers shifted dramatically, disappearing entirely from low latitudes to become limited to cooler, lower saturation-state areas. By comparing these range shift data with the environmental parameters from an Earth system model, we show that the principal control on these range retractions was temperature, with survival maintained in high-latitude refugia, despite more adverse ocean chemistry conditions. Deleterious effects of OA were only evidenced when twinned with elevated temperatures.

Type: Article
Title: Ocean warming, not acidification, controlled coccolithophore response during past greenhouse climate change
Open access status: An open access version is available from UCL Discovery
DOI: 10.1130/G37273.1
Publisher version: http://dx.doi.org/10.1130/G37273.1
Language: English
Additional information: © 2015 The Authors. Gold Open Access: This paper is published under the terms of the CC-BY license
Keywords: Science & Technology, Physical Sciences, Geology, Eocene Thermal Maximum, Calcification, Biomineralization, Evolution, Plankton
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Earth Sciences
URI: https://discovery.ucl.ac.uk/id/eprint/1499028
Downloads since deposit
41Downloads
Download activity - last month
Download activity - last 12 months
Downloads by country - last 12 months

Archive Staff Only

View Item View Item