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Pliocene oceanic seaways and global climate

Cyrus Karas; Dirk Nurnberg; Andre Bahr; Jeroen Groeneveld; Jens O. Herrle; Ralf Tiedemann; Peter B. deMenocal

Title:
Pliocene oceanic seaways and global climate
Author(s):
Karas, Cyrus
Nurnberg, Dirk
Bahr, Andre
Groeneveld, Jeroen
Herrle, Jens O.
Tiedemann, Ralf
deMenocal, Peter B.
Date:
Type:
Articles
Department(s):
Lamont-Doherty Earth Observatory
Earth and Environmental Sciences
Volume:
7
Persistent URL:
Book/Journal Title:
Scientific Reports
Abstract:
Tectonically induced changes in oceanic seaways had profound effects on global and regional climate during the Late Neogene. The constriction of the Central American Seaway reached a critical threshold during the early Pliocene ~4.8–4 million years (Ma) ago. Model simulations indicate the strengthening of the Atlantic Meridional Overturning Circulation (AMOC) with a signature warming response in the Northern Hemisphere and cooling in the Southern Hemisphere. Subsequently, between ~4–3 Ma, the constriction of the Indonesian Seaway impacted regional climate and might have accelerated the Northern Hemisphere Glaciation. We here present Pliocene Atlantic interhemispheric sea surface temperature and salinity gradients (deduced from foraminiferal Mg/Ca and stable oxygen isotopes, δ18O) in combination with a recently published benthic stable carbon isotope (δ13C) record from the southernmost extent of North Atlantic Deep Water to reconstruct gateway-related changes in the AMOC mode. After an early reduction of the AMOC at ~5.3 Ma, we show in agreement with model simulations of the impacts of Central American Seaway closure a strengthened AMOC with a global climate signature. During ~3.8–3 Ma, we suggest a weakening of the AMOC in line with the global cooling trend, with possible contributions from the constriction of the Indonesian Seaway.
Subject(s):
Paleoceanography
Paleoclimatology
Climatic changes
Ocean-atmosphere interaction
Publisher DOI:
https://doi.org/10.1038/srep39842
Item views
32
Metadata:
text | xml
Suggested Citation:
Cyrus Karas, Dirk Nurnberg, Andre Bahr, Jeroen Groeneveld, Jens O. Herrle, Ralf Tiedemann, Peter B. deMenocal, , Pliocene oceanic seaways and global climate, Columbia University Academic Commons, .

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