Article ID Journal Published Year Pages File Type
4718860 Marine Geology 2010 5 Pages PDF
Abstract

Shell weights of Globigerinoides sacculifer and the elemental concentration of magnesium and calcium (Mg/Ca) from Globigerinoides ruber measured from an Arabian Sea sediment core, AAS9/21, exhibit an inverse relationship with each other, which reveals that shell weights are mainly controlled by surface water [CO3=] rather than calcification temperature. Down core shell weight variations of Core AAS9/21 show an excellent correspondence with CO2 concentrations in an Antarctic Ice Core, which reveals that planktic forminifera shells can trace atmospheric CO2 due to the resultant change in surface water [CO3=]. Hence, shell weights of G. sacculifer can be used as a proxy to reconstruct atmospheric CO2 concentrations in the past. Here, based on the shell weights, surface water [CO3=] change in the Arabian Sea is quantified and found that a [CO3=] variation of ∼ 8 μmol/kg occurred during the Holocene and a ∼ 36 μmol/kg variation occurred during the last glacial period.

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Physical Sciences and Engineering Earth and Planetary Sciences Geochemistry and Petrology
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