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    Equatorial Indian Ocean productivity during the last 33 kyr and possible linkage to Westerly Jet variability

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    Mar_Geol_348_44a.pdf (792.6Kb)
    Date
    2014
    Author
    Punyu, V.R.
    Banakar, V.K.
    Garg, A.
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    Abstract
    The top 1 m radiocarbon dated section of a 5.6 m long sediment core retrieved from the Equatorial Indian Ocean is studied for productivity changes in response to climate variability that have taken place during the last ~33 kyr. The robust indicators of marine productivity such as phytol and brassicasterol exhibit distinctly higher contents (av.5.8 ng/g and 4.8 ng/g respectively) during the LGM (25–17 ky BP) as compared to the succeeding period (16–5 ky BP: av.1.9 ng/g each) and preceding period (33–25 ky BP: av.1.8 and 0.8 ng/g respectively) which suggest increased productivity during the cold and dry climate of the LGM. The C<sub>org</sub>content is also relatively higher during this period than the warmer Holocene. However, marginally higher C/N ratios (~7.8) and enrichment of delta<sup>13</sup> C<sub>org</sub>(~-19.8‰) during the LGM than the Holocene (C/N ~6.4 and delta<sup>13</sup> C<sub>org</sub>~- 21.5‰), and also the higher carbon preference index (CPI) of n-alkanes and n-alkanols together suggest the presence of terrestrial organic matter in the sediment. The increased equatorial productivity and terrestrial organic matter input together during the LGM may indicate intensified inter-monsoon equatorial Westerly Jets resulting in elevated productivity
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    http://drs.nio.org/drs/handle/2264/4458
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