Evidence of stable foraminifera biomineralization during the last two climate cycles in the tropical Atlantic Ocean
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 st...
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ftnkunivathens:oai:lib.uoa.gr:uoadl:3035126 2024-02-11T10:06:26+01:00 Evidence of stable foraminifera biomineralization during the last two climate cycles in the tropical Atlantic Ocean Zarkogiannis, S.D. Antonarakou, A. Fernandez, V. Graham Mortyn, P. Kontakiotis, G. Drinia, H. Greaves, M. 2020-01-01 https://pergamos.lib.uoa.gr/uoa/dl/object/uoadl:3035126 Αγγλικά English eng uoadl:3035126 https://pergamos.lib.uoa.gr/uoa/dl/object/uoadl:3035126 scientific_publication_article Επιστημονική δημοσίευση - Άρθρο Περιοδικού Scientific publication - Journal Article 2020 ftnkunivathens 2024-01-18T19:13:50Z 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. © 2020 by the authors. Article in Journal/Newspaper North Atlantic Planktonic foraminifera Pergamos - Library and Information Center of National and Kapodistrian University of Athens |
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Open Polar |
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Pergamos - Library and Information Center of National and Kapodistrian University of Athens |
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ftnkunivathens |
language |
English |
description |
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. © 2020 by the authors. |
format |
Article in Journal/Newspaper |
author |
Zarkogiannis, S.D. Antonarakou, A. Fernandez, V. Graham Mortyn, P. Kontakiotis, G. Drinia, H. Greaves, M. |
spellingShingle |
Zarkogiannis, S.D. Antonarakou, A. Fernandez, V. Graham Mortyn, P. Kontakiotis, G. Drinia, H. Greaves, M. Evidence of stable foraminifera biomineralization during the last two climate cycles in the tropical Atlantic Ocean |
author_facet |
Zarkogiannis, S.D. Antonarakou, A. Fernandez, V. Graham Mortyn, P. Kontakiotis, G. Drinia, H. Greaves, M. |
author_sort |
Zarkogiannis, S.D. |
title |
Evidence of stable foraminifera biomineralization during the last two climate cycles in the tropical Atlantic Ocean |
title_short |
Evidence of stable foraminifera biomineralization during the last two climate cycles in the tropical Atlantic Ocean |
title_full |
Evidence of stable foraminifera biomineralization during the last two climate cycles in the tropical Atlantic Ocean |
title_fullStr |
Evidence of stable foraminifera biomineralization during the last two climate cycles in the tropical Atlantic Ocean |
title_full_unstemmed |
Evidence of stable foraminifera biomineralization during the last two climate cycles in the tropical Atlantic Ocean |
title_sort |
evidence of stable foraminifera biomineralization during the last two climate cycles in the tropical atlantic ocean |
publishDate |
2020 |
url |
https://pergamos.lib.uoa.gr/uoa/dl/object/uoadl:3035126 |
genre |
North Atlantic Planktonic foraminifera |
genre_facet |
North Atlantic Planktonic foraminifera |
op_relation |
uoadl:3035126 https://pergamos.lib.uoa.gr/uoa/dl/object/uoadl:3035126 |
_version_ |
1790604165679939584 |