Middle Eocene Seawater pH and Atmospheric Carbon Dioxide Concentrations

Author:

Pearson Paul N.1,Palmer Martin R.2

Affiliation:

1. Department of Earth Sciences, University of Bristol, Bristol BS8 1RJ, UK.

2. T. H. Huxley School, Royal School of Mines, Imperial College, Prince Consort Road, London SW7 2BP, UK.

Abstract

The carbon dioxide content of the atmosphere [measured as the partial pressure of CO 2 (pCO 2 )] affects the content of the surface ocean, which in turn affects seawater pH. The boron isotope composition (δ 11 B) of contemporaneous planktonic foraminifera that calcified their tests at different water depths can be used to reconstruct the pH-depth profile of ancient seawater. Construction of a pH profile for the middle Eocene tropical Pacific Ocean shows that atmospheric pCO 2 was probably similar to modern concentrations or slightly higher.

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

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