Articles | Volume 18, issue 8
Research article
03 Aug 2022
Research article |  | 03 Aug 2022

Changes in productivity and intermediate circulation in the northern Indian Ocean since the last deglaciation: new insights from benthic foraminiferal Cd ∕ Ca records and benthic assemblage analyses

Ruifang Ma, Sophie Sépulcre, Laetitia Licari, Frédéric Haurine, Franck Bassinot, Zhaojie Yu, and Christophe Colin

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Cited articles

Almogi-Labin, A., Schmiedl, G., Hemleben, C., Siman-Tov, R., Segl, M., and Meischner, D.: The influence of the NE winter monsoon on productivity changes in the Gulf of Aden, NW Arabian Sea, during the last 530 ka as recorded by foraminifera, Mar. Micropaleontol., 40, 295–319, 2000. 
Altabet, M. A., Higginson, M. J., and Murray, R. W.: The effect of millennial-scale changes in theArabian Sea denitrification on atmospheric CO2, Nature, 415, 159–162, 2002. 
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Anderson, R. F., Ali, S., Bradtmiller, L. I., Nielsen, S. H. H., Fleisher, M. Q., Anderson, B. E., and Burckle, L. H.: Wind-driven upwelling in the Southern Ocean and the deglacial rise in atmospheric CO2, Science, 323, 1443–1448, 2009. 
Banse, K.: Seasonality of phytoplankton chlorophyll in the central and northern Arabian Sea, Deep-Sea Res., 34, 713–723, 1987. 
Short summary
We provide high-resolution Cd / Ca records of benthic foraminifera on two cores from the northern Indian Ocean since the last deglaciation. We reconstructed intermediate Cdw records based on Cd / Ca. Combined with benthic foraminiferal assemblages, we show that intermediate Cdw during the last deglaciation was mainly influenced by the ventilation of intermediate–bottom water masses. Thereafter during the Holocene surface productivity is the main forcing factor related to monsoon precipitation.