Evidence of stable foraminifera biomineralization during the last two climate cycles in the tropical Atlantic ocean
Zarkogiannis, Stergios (National & Kapodistrian University of Athens. Department of Historical Geology-Paleontology (Greece))
Antonarakou, Assimina (National & Kapodistrian University of Athens. Department of Historical Geology-Paleontology (Greece))
Fernandez, Vincent (Natural History Museum. Imaging and Analysis Centre (UK))
Mortyn, P. Graham (Universitat Autònoma de Barcelona. Institut de Ciència i Tecnologia Ambientals)
Kontakiotis, George (National & Kapodistrian University of Athens. Department of Historical Geology-Paleontology (Greece))
Drinia, Hara (National & Kapodistrian University of Athens. Department of Historical Geology-Paleontology (Greece))
Greaves, Mervyn (University of Cambridge. Department of Earth Sciences (UK))
Universitat Autònoma de Barcelona. Departament de Geografia

Data:	2020
Resum:	Planktonic foraminiferal biomineralization intensity, reflected by the weight of their shell calcite mass, affects global carbonate deposition and is known to follow climatic cycles by being increased during glacial stages and decreased during interglacial stages. Here, we measure the dissolution state and the mass of the shells of the planktonic foraminifera species Globigerina bulloides from a Tropical Eastern North Atlantic site over the last two glacial-interglacial climatic transitions, and we report no major changes in plankton calcite production with the atmospheric pCO2 variations. We attribute this consistency in foraminifera calcification to the climatic and hydrological stability of the tropical regions. However, we recorded increased shell masses midway through the penultimate deglaciation (Termination II). In order to elucidate the cause of the increased shell weights, we performed δ18O, Mg/Ca, and μCT measurements on the same shells from a number of samples surrounding this event. Compared with the lighter ones, we find that the foraminifera of increased weight are internally contaminated by sediment infilling and that their shell masses respond to local surface seawater density changes.
Nota:	Unidad de excelencia María de Maeztu CEX2019-000940-M
Drets:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original.
Llengua:	Anglès
Document:	Article ; recerca ; Versió publicada
Matèria:	Planktonic foraminifera ; Shell weight ; Climate variability ; Sea surface density ; Carbonate production ; X-ray microscopy (μCT) ; δ18O and Mg/Ca analyses
Publicat a:	Journal of marine science and engineering, Vol. 8, Issue 10 (October 2020) , art. 737, ISSN 2077-1312

DOI: 10.3390/jmse8100737

17 p, 4.9 MB

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