Articles | Volume 15, issue 1
https://doi.org/10.5194/essd-15-171-2023
https://doi.org/10.5194/essd-15-171-2023
Data description paper
 | 
10 Jan 2023
Data description paper |  | 10 Jan 2023

Large freshwater-influx-induced salinity gradient and diagenetic changes in the northern Indian Ocean dominate the stable oxygen isotopic variation in Globigerinoides ruber

Rajeev Saraswat, Thejasino Suokhrie, Dinesh K. Naik, Dharmendra P. Singh, Syed M. Saalim, Mohd Salman, Gavendra Kumar, Sudhira R. Bhadra, Mahyar Mohtadi, Sujata R. Kurtarkar, and Abhayanand S. Maurya

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Cited articles

Achyuthan, H., Deshpande, R. D., Rao, M. S., Kumar, B., Nallathambi, T., Shashi Kumar, K., Ramesh, R., Ramachandran, P., Maurya, A. S., and Gupta, S. K.: Stable isotopes and salinity in the surface waters of the Bay of Bengal: Implications for water dynamics and palaeoclimate, Mar. Chem., 149, 51–62, 2013. 
Anderson, D. M.: Attenuation of millennial-scale events by bioturbation in marine sediments, Paleoceanography, 16, 352–357, 2001. 
Bé, A. W. H. and Hutson, W. H.: Ecology of planktonic foraminifera and biogeographic patterns of life and fossil assemblages in the Indian Ocean, Micropaleontology, 23, 369–414, 1977. 
Bemis, B. E., Spero, H. J., Bijma, J., and Lea, D. W.: Reevaluation of the oxygen isotopic composition of planktonic foraminifera: Experimental results and revised paleotemperature equations, Paleoceanography, 13, 150–160, 1998. 
Berger, W. H.: Sedimentation of planktonic foraminifera, Mar. Geol., 11, 325–358, 1971. 
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Short summary
Much effort is made to project monsoon changes by reconstructing the past. The stable oxygen isotopic ratio of marine calcareous organisms is frequently used to reconstruct past monsoons. Here, we use the published and new stable oxygen isotopic data to demonstrate a diagenetic effect and a strong salinity influence on the oxygen isotopic ratio of foraminifera in the northern Indian Ocean. We also provide updated calibration equations to deduce monsoons from the oxygen isotopic ratio.