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Volume 13, issue 2 | Copyright
Clim. Past, 13, 149-170, 2017
https://doi.org/10.5194/cp-13-149-2017
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 24 Feb 2017

Research article | 24 Feb 2017

A record of Neogene seawater δ11B reconstructed from paired δ11B analyses on benthic and planktic foraminifera

Rosanna Greenop et al.
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Al-Rousan, S., Pätzold, J., Al-Moghrabi, S., and Wefer, G.: Invasion of anthropogenic CO2 recorded in planktonic foraminifera from the northern Gulf of Aqaba, Int. J. Earth Sci., 93, 1066–1076, 2004.
Anagnostou, E., John, E. H., Edgar, K. M., Foster, G. L., Ridgewell, A., Inglis, G. N., Pancost, R. D., Lunt, D. J., and Pearson, P. N.: Changing atmospheric CO2 concentration was the primary driver of early Cenozoic climate, Nature, 533, 380–384, 2016.
Anand, P., Elderfield, H., and Conte, M. H.: Calibration of Mg ∕ Ca thermometry in planktonic foraminifera from a sediment trap time series, Paleoceanography, 18, 1–15, https://doi.org/10.1029/2002PA000846, 2003.
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Bartoli, G., Hönisch, B., and Zeebe, R. E.: Atmospheric CO2 decline during the Pliocene intensification of Northern Hemisphere glaciations, Paleoceanography, 26, PA4213, https://doi.org/10.1029/2010PA002055, 2011.
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Understanding the boron isotopic composition of seawater (δ11Bsw) is key to calculating absolute estimates of CO2 using the boron isotope pH proxy. Here we use the boron isotope gradient, along with an estimate of pH gradient, between the surface and deep ocean to show that the δ11Bsw varies by ~ 2 ‰ over the past 23 million years. This new record has implications for both δ11Bsw and CO2 records and understanding changes in the ocean isotope composition of a number of ions through time.
Understanding the boron isotopic composition of seawater (δ11Bsw) is key to calculating...
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