Pearson PN, Palmer MR
Department of Earth Sciences, University of Bristol, Bristol BS8 1RJ, UK. T. H. Huxley School, Royal School of Mines, Imperial College, Prince Consort Road, London SW7 2BP, UK.
Science. 1999 Jun 11;284(5421):1824-6. doi: 10.1126/science.284.5421.1824.
The carbon dioxide content of the atmosphere [measured as the partial pressure of CO2 (pCO2)] affects the content of the surface ocean, which in turn affects seawater pH. The boron isotope composition (delta11B) 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 pCO2 was probably similar to modern concentrations or slightly higher.
大气中的二氧化碳含量[以二氧化碳分压（pCO2）衡量]会影响表层海洋的含量，而这又会反过来影响海水的pH值。在不同水深钙化其外壳的同期浮游有孔虫的硼同位素组成（δ11B）可用于重建古代海水的pH值深度剖面。对始新世中期热带太平洋的pH值剖面进行构建后发现，大气中的pCO2可能与现代浓度相似或略高。
