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Boron1 - B 11 A proxy for Paleo-CO2 Andrea Amanda Mitra and...

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δ 11 B A proxy for Paleo-CO 2 Andrea, Amanda, Mitra, and Carly 10/06/2010
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Boron Isotope Ratios Boron isotope ratios (δ 11 B) from planktonic foraminifera shells and coral skeletons (calcium carbonate) are used to estimate the pH of sea water in order to reconstruct paleo CO 2 levels.
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Boron Isotope Ratios Paleo CO 2 is estimated by indirect measurements Based on the premise that a rise in CO 2 leads to more CO 2 dissolved in the ocean which results in a reduced ocean pH
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Boron Isotope Ratios Boron occurs in the ocean in two forms: B(OH) 3 and B(OH) - 4 Equilibrium between these two compounds is pH dependent Fractionation between these two compounds occurs ca -19.5 ‰ B(OH) 4 - is main Boron component of marine shells
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Boron Isotope Ratios Boron is more basic than acidic sea water Boron half life = 20 million years Isotope ratios can reconstruct paleoconditions hundreds of thousands to millions of years back. Foraminifera species calcify at different, known layers in the ocean Surface vs deeper foraminifera have different Boron isotope ratios
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Backing out δ 11
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