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Late Pliocene marine pCO2 reconstructions from the Subarctic Pacific Ocean

Swann, G.E.A.; Kendrick, C.P.; Dickson, A.J.; Worne, Savannah

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Authors

C.P. Kendrick

A.J. Dickson

Savannah Worne



Abstract

The development of large ice-sheets across the Northern Hemisphere during the late Pliocene and the emergence of the glacial-interglacial cycles that punctuate the Quaternary mark a significant threshold in Earth's climate history. Although a number of different mechanisms have been proposed to initiate this cooling and the onset of major Northern Hemisphere glaciation, reductions in atmospheric concentrations of CO2 likely played a key role. The emergence of a stratified (halocline) water column in the subarctic north-west Pacific Ocean at 2.73 Ma has often been interpreted as an event which would have limited oceanic ventilation of CO2 to the atmosphere, thereby helping to cool the global climate system. Here, diatom carbon isotopes (δ13Cdiatom) are used to reconstruct changes in regional carbon dynamics through this interval. Results show that the development of a salinity stratification did not fundamental alter the net oceanic/atmospheric flux of CO2 in the subarctic north-west Pacific Ocean through the late Pliocene/early Quaternary. These results provide further insights into the long-term controls on global carbon cycling and the role of the subarctic Pacific Ocean in instigating global climatic changes.

Citation

Swann, G., Kendrick, C., Dickson, A., & Worne, S. (in press). Late Pliocene marine pCO2 reconstructions from the Subarctic Pacific Ocean. Paleoceanography and Paleoclimatology, https://doi.org/10.1029/2017PA003296

Journal Article Type Article
Acceptance Date Apr 17, 2018
Online Publication Date Apr 27, 2018
Deposit Date May 1, 2018
Publicly Available Date Oct 28, 2019
Journal Paleoceanography and Paleoclimatology
Print ISSN 2572-4517
Electronic ISSN 2572-4525
Publisher Wiley
Peer Reviewed Peer Reviewed
DOI https://doi.org/10.1029/2017PA003296
Public URL https://nottingham-repository.worktribe.com/output/929243
Publisher URL https://agupubs.onlinelibrary.wiley.com/doi/abs/10.1029/2017PA003296

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