Articles | Volume 19, issue 3
https://doi.org/10.5194/cp-19-555-2023
https://doi.org/10.5194/cp-19-555-2023
Research article
 | 
14 Mar 2023
Research article |  | 14 Mar 2023

A 600 kyr reconstruction of deep Arctic seawater δ18O from benthic foraminiferal δ18O and ostracode Mg ∕ Ca paleothermometry

Jesse R. Farmer, Katherine J. Keller, Robert K. Poirier, Gary S. Dwyer, Morgan F. Schaller, Helen K. Coxall, Matt O'Regan, and Thomas M. Cronin

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Cited articles

Aagaard, K. and Carmack, E. C.: The role of sea ice and other fresh water in the Arctic circulation, J. Geophys. Res.-Oceans, 94, 14485-=–14498, 1989. 
Adkins, J. F., McIntyre, K., and Schrag, D. P.: The Salinity, Temperature, and δ18O of the Glacial Deep Ocean, Science, 298, 1769–1773, 2002. 
Ahn, S., Khider, D., Lisiecki, L. E., and Lawrence, C. E.: A probabilistic Pliocene-Pleistocene stack of benthic δ18O using a profile hidden Markov model, Dynam. Stat. Clim. Sys., 2, dzx002, https://doi.org/10.1093/climsys/dzx002, 2017. 
Anderson, L. G., Björk, G., Holby, O., Jones, E. P., Kattner, G., Koltermann, K. P., Liljebald, B., Lindegren, R., and Swift, J.: Water masses and circulation in the Eurasian Basin: Results from the Oden 91 expedition, J. Geophys. Res.-Oceans, 99, 3273–3283, 1994. 
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Oxygen isotopes are used to date marine sediments via similar large-scale ocean patterns over glacial cycles. However, the Arctic Ocean exhibits a different isotope pattern, creating uncertainty in the timing of past Arctic climate change. We find that the Arctic Ocean experienced large local oxygen isotope changes over glacial cycles. We attribute this to a breakdown of stratification during ice ages that allowed for a unique low isotope value to characterize the ice age Arctic Ocean.