Influence of surface ocean density on planktonic foraminifera calcification - Archive ouverte HAL Access content directly
Journal Articles Scientific Reports Year : 2019

Influence of surface ocean density on planktonic foraminifera calcification

, , (1) , , , ,
1
Stergios D. Zarkogiannis
  • Function : Author
Assimina Antonarakou
  • Function : Author
George Kontakiotis
  • Function : Author
P. Graham Mortyn
  • Function : Author
Hara Drinia
Mervyn Greaves
  • Function : Author

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.
Fichier principal
Vignette du fichier
s41598-018-36935-7.pdf (1.59 Mo) Télécharger le fichier
Origin : Publisher files allowed on an open archive

Dates and versions

insu-03684845 , version 1 (01-06-2022)

Licence

Attribution - CC BY 4.0

Identifiers

Cite

Stergios D. Zarkogiannis, Assimina Antonarakou, Aradhna Tripati, George Kontakiotis, P. Graham Mortyn, et al.. Influence of surface ocean density on planktonic foraminifera calcification. Scientific Reports, 2019, 9, 203, p. 38-55. ⟨10.1038/s41598-018-36935-7⟩. ⟨insu-03684845⟩
13 View
7 Download

Altmetric

Share

Gmail Facebook Twitter LinkedIn More