Influence of surface ocean density on planktonic foraminifera calcification

Zarkogiannis, Stergios D. and Antonarakou, Assimina and Tripati, Aradhna and Kontakiotis, George and Mortyn, P. Graham and Drinia, Hara and Greaves, Mervyn (2019) Influence of surface ocean density on planktonic foraminifera calcification. Scientific Reports, 9 (1). ISSN 2045-2322 DOI https://doi.org/10.1038/s41598-018-36935-7

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Official URL: https://doi.org/10.1038/s41598-018-36935-7

Abstract

This study provides evidence that ambient seawater density influences calcification and may account for the observed planktonic foraminifera shell mass increase during glacial times. Volumes of weighed fossil Globigerina bulloides shells were accurately determined using X-ray Computer Tomography and were combined with water density reconstructions from Mg/Ca and δ18O measurements to estimate the buoyancy force exerted on each shell. After assessment of dissolution effects, the resulting relationship between shell mass and buoyancy suggests that heavier shells would need to be precipitated in glacial climates in order for these organisms to remain at their optimum living depth, and counterbalance the increased buoyant force of a denser, glacial ocean. Furthermore, the reanalysis of bibliographic data allowed the determination of a relationship between G. bulloides shell mass and ocean density, which introduces implications of a negative feedback mechanism for the uptake of atmospheric CO2 by the oceans.

Item Type: Article
Uncontrolled Keywords: 2018AREP; IA74
Subjects: 01 - Climate Change and Earth-Ocean Atmosphere Systems
Divisions: 01 - Climate Change and Earth-Ocean Atmosphere Systems
07 - Gold Open Access
Journal or Publication Title: Scientific Reports
Volume: 9
Identification Number: https://doi.org/10.1038/s41598-018-36935-7
Depositing User: Sarah Humbert
Date Deposited: 25 Jan 2019 15:22
Last Modified: 25 Jan 2019 15:22
URI: http://eprints.esc.cam.ac.uk/id/eprint/4403

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