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    Tracing the strength of the southwest monsoon using boron isotopes in the eastern Arabian Sea

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    Geophys_Res_Lett_42_1450a.pdf (384.3Kb)
    Date
    2015
    Author
    Naik, S.S.
    Naidu, P.D.
    Foster, G.L.
    Martínez-Boti, M.A.
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    Abstract
    Here we present the first boron isotope-based pCO<sub>2</sub><sup>sw</sup> (pCO<sub>2</sub> of seawater) reconstruction from the eastern Arabian Sea using the planktic foraminifera species Globigerinoides ruber. Our results from sediment core AAS9/21 show that pCO<sub>2</sub><sup>sw</sup> varied between ~160 and 300 µatm during the last 23 kyr. The deltapCO<sub>2</sub>, the sea-air pCO<sub>2</sub> difference, is relatively small during the last glacial maximum and becomes more negative towards the Holocene, with the exception of a significant excess during the last deglaciation centered on the Bølling-Ållerød. Throughout the record, deltapCO<sub>2</sub> is predominantly negative, probably as a result of enhanced biological productivity (and higher nutrient and carbon utilization) during the southwest monsoon. A reduction in deltapCO<sub>2</sub> during the last glacial maximum is therefore consistent with a reduction in the strength of this monsoon system.
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    http://drs.nio.org/drs/handle/2264/4752
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