Penultimate deglacial warming across the Mediterranean Sea revealed by clumped isotopes in foraminifera
The variability of seawater temperature through time is a critical measure of climate change, yet its reconstruction remains problematic in many regions. Mg/Ca and oxygen isotope (δ 18OC) measurements in foraminiferal carbonate shells can be combined to reconstruct seawater temperature and δ 18O (δ...
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ftunivutrecht:oai:dspace.library.uu.nl:1874/366629 2023-11-12T04:22:26+01:00 Penultimate deglacial warming across the Mediterranean Sea revealed by clumped isotopes in foraminifera Rodríguez-Sanz, L. Bernasconi, S. M. Marino, G. Heslop, D. Müller, I. A. Fernandez, A. Grant, K. M. Rohling, E. J. non-UU output of UU-AW members 2017-11-29 image/pdf https://dspace.library.uu.nl/handle/1874/366629 en eng 2045-2322 https://dspace.library.uu.nl/handle/1874/366629 info:eu-repo/semantics/OpenAccess Article 2017 ftunivutrecht 2023-11-01T23:17:26Z The variability of seawater temperature through time is a critical measure of climate change, yet its reconstruction remains problematic in many regions. Mg/Ca and oxygen isotope (δ 18OC) measurements in foraminiferal carbonate shells can be combined to reconstruct seawater temperature and δ 18O (δ 18OSW). The latter is a measure of changes in local hydrology (e.g., precipitation/evaporation, freshwater inputs) and global ice volume. But diagenetic processes may affect foraminiferal Mg/Ca. This restricts its potential in many places, including the Mediterranean Sea, a strategic region for deciphering global climate and sea-level changes. High alkalinity/salinity conditions especially bias Mg/Ca temperatures in the eastern Mediterranean (eMed). Here we advance the understanding of both western Mediterranean (wMed) and eMed hydrographic variability through the penultimate glacial termination (TII) and last interglacial, by applying the clumped isotope (Δ 47) paleothermometer to planktic foraminifera with a novel data-processing approach. Results suggest that North Atlantic cooling during Heinrich stadial 11 (HS11) affected surface-water temperatures much more in the wMed (during winter/spring) than in the eMed (during summer). The method’s paired Δ 47 and δ 18OC data also portray δ 18OSW. These records reveal a clear HS11 freshwater signal, which attenuated toward the eMed, and also that last interglacial surface warming in the eMed was strongly amplified by water-column stratification during the deposition of the organic-rich (sapropel) interval known as S5. Article in Journal/Newspaper North Atlantic Utrecht University Repository |
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Utrecht University Repository |
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ftunivutrecht |
language |
English |
description |
The variability of seawater temperature through time is a critical measure of climate change, yet its reconstruction remains problematic in many regions. Mg/Ca and oxygen isotope (δ 18OC) measurements in foraminiferal carbonate shells can be combined to reconstruct seawater temperature and δ 18O (δ 18OSW). The latter is a measure of changes in local hydrology (e.g., precipitation/evaporation, freshwater inputs) and global ice volume. But diagenetic processes may affect foraminiferal Mg/Ca. This restricts its potential in many places, including the Mediterranean Sea, a strategic region for deciphering global climate and sea-level changes. High alkalinity/salinity conditions especially bias Mg/Ca temperatures in the eastern Mediterranean (eMed). Here we advance the understanding of both western Mediterranean (wMed) and eMed hydrographic variability through the penultimate glacial termination (TII) and last interglacial, by applying the clumped isotope (Δ 47) paleothermometer to planktic foraminifera with a novel data-processing approach. Results suggest that North Atlantic cooling during Heinrich stadial 11 (HS11) affected surface-water temperatures much more in the wMed (during winter/spring) than in the eMed (during summer). The method’s paired Δ 47 and δ 18OC data also portray δ 18OSW. These records reveal a clear HS11 freshwater signal, which attenuated toward the eMed, and also that last interglacial surface warming in the eMed was strongly amplified by water-column stratification during the deposition of the organic-rich (sapropel) interval known as S5. |
author2 |
non-UU output of UU-AW members |
format |
Article in Journal/Newspaper |
author |
Rodríguez-Sanz, L. Bernasconi, S. M. Marino, G. Heslop, D. Müller, I. A. Fernandez, A. Grant, K. M. Rohling, E. J. |
spellingShingle |
Rodríguez-Sanz, L. Bernasconi, S. M. Marino, G. Heslop, D. Müller, I. A. Fernandez, A. Grant, K. M. Rohling, E. J. Penultimate deglacial warming across the Mediterranean Sea revealed by clumped isotopes in foraminifera |
author_facet |
Rodríguez-Sanz, L. Bernasconi, S. M. Marino, G. Heslop, D. Müller, I. A. Fernandez, A. Grant, K. M. Rohling, E. J. |
author_sort |
Rodríguez-Sanz, L. |
title |
Penultimate deglacial warming across the Mediterranean Sea revealed by clumped isotopes in foraminifera |
title_short |
Penultimate deglacial warming across the Mediterranean Sea revealed by clumped isotopes in foraminifera |
title_full |
Penultimate deglacial warming across the Mediterranean Sea revealed by clumped isotopes in foraminifera |
title_fullStr |
Penultimate deglacial warming across the Mediterranean Sea revealed by clumped isotopes in foraminifera |
title_full_unstemmed |
Penultimate deglacial warming across the Mediterranean Sea revealed by clumped isotopes in foraminifera |
title_sort |
penultimate deglacial warming across the mediterranean sea revealed by clumped isotopes in foraminifera |
publishDate |
2017 |
url |
https://dspace.library.uu.nl/handle/1874/366629 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_relation |
2045-2322 https://dspace.library.uu.nl/handle/1874/366629 |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1782337477359435776 |