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

Greenop, Rosanna; Hain, Mathis P.; Sosdian, Sindia M.; Oliver, Kevin I. C.; Goodwin, Philip; Chalk, Thomas B.; Lear, Caroline H.; Wilson, Paul A.; Foster, Gavin L.

doi:https://doi.org/10.5194/cp-13-149-2017

Articles | Volume 13, issue 2

https://doi.org/10.5194/cp-13-149-2017

© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.

https://doi.org/10.5194/cp-13-149-2017

© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.

Articles | Volume 13, issue 2

Research article

| Highlight paper

|

24 Feb 2017

Research article | Highlight paper |

| 24 Feb 2017

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

Rosanna Greenop, Mathis P. Hain, Sindia M. Sosdian, Kevin I. C. Oliver, Philip Goodwin, Thomas B. Chalk, Caroline H. Lear, Paul A. Wilson, and Gavin L. Foster

Supplement

https://doi.org/10.5194/cp-13-149-2017-supplement

Data sets

Ocean Data View R. Schlitzer http://www.awi-bremerhaven.de/GEO/ODV

Planktic and benthic boron and carbon isotopes from ODP sites 121-758 R. Greenop, M. P. Hain, S. M. Sosdian, K. I. C. Oliver, P. Goodwin, T. B. Chalk, C. H. Lear, P. A. Wilson, and G. L. Foster https://doi.pangaea.de/10.1594/PANGAEA.871900

Short summary

Understanding the boron isotopic composition of seawater (δ¹¹B_sw) 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 δ¹¹B_sw varies by ~ 2 ‰ over the past 23 million years. This new record has implications for both δ¹¹B_sw and CO₂ records and understanding changes in the ocean isotope composition of a number of ions through time.