Mid-Pliocene Mg/Ca and clumped isotope bottom water temperatures from ODP Site 138-849 and IODP Site 303-U1308 ...

The mid-Pliocene (3.3-3.0 million years ago) is an important possible analogue to future, warmer-than-present climates. This interval is the most recent period in Earth's history of sustained global warmth, when atmospheric CO2 concentrations were comparable to the early 21th century, global ic...

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Bibliographic Details
Main Authors: Braaten, Anna Hauge, Jakob, Kim A, Ho, Sze Ling, Friedrich, Oliver, Galaasen, Eirik Vinje, De Schepper, Stijn, Wilson, Paul A, Meckler, Anna Nele
Format: Article in Journal/Newspaper
Language:English
Published: PANGAEA 2023
Subjects:
bottom water temperature
Clumped isotopes
Foraminifera
Mg/Ca
mid-Pliocene warm period
MIS M2
stable isotope geochemistry
Pacific
North Atlantic
Online Access:https://dx.doi.org/10.1594/pangaea.960832
https://doi.pangaea.de/10.1594/PANGAEA.960832
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Summary:The mid-Pliocene (3.3-3.0 million years ago) is an important possible analogue to future, warmer-than-present climates. This interval is the most recent period in Earth's history of sustained global warmth, when atmospheric CO2 concentrations were comparable to the early 21th century, global ice volume was reduced and sea-levels were significantly higher than at present. Relatively few deep ocean temperature records exist from this time interval, but some available data suggest that large differences in temperatures existed between different deep ocean basins. This is in contrast to the modern ocean, which is relatively isothermal across the various basins at similar depth. In order to verify the possibility of a large temperature gradient between the deep Pacific and deep North Atlantic oceans, we generated new benthic foraminiferal carbonate clumped isotope (Δ47) and Mg/Ca bottom water temperatures from Pacific ODP Site 849 and North Atlantic IODP Site U1308. We find that the deep North Atlantic was ...

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