North Indian Ocean benthic foraminifera elemental ratio data since the last deglaciation

• Main Authors: Ma, Ruifang, Sépulcre, Sophie, Bassinot, Franck C, Haurine, Frédéric, Tisnérat-Laborde, Nadine, Colin, Christophe
• Format: Dataset
• Language: English
• Published: PANGAEA 2020
• Subjects: benthic elemental ratios; Carbon isotopes; Circulation intermédiaire dans l'océan Indien depuis la dernière période glaciaire; CITRON-GLACE; LabEx Institut Pierre Simon Laplace (IPSL): Understand climate and anticipate future changes; L-IPSL; Oxygen isotopes; Indian; Laplace; Planktonic foraminifera
• Online Access: https://doi.pangaea.de/10.1594/PANGAEA.916015; https://doi.org/10.1594/PANGAEA.916015

The evolution of intermediate circulation in the northern Indian Ocean since the last deglaciation has been reconstructed from two marine cores located at intermediate depths off the southern tip of India (MD77-191) and in the northern Bay of Bengal (MD77-176). This data provide high resolution records of benthic and planktonic foraminiferal δ13C, δ18O, and elemental ratios (Mg/Ca, Sr/Ca, Li/Ca, Mg/Li and U/Ca) from these two cores in the northern Indian Ocean. Stable isotope analyses were performed on well-preserved (clean and intact) samples of planktonic foraminifera Globigerinoides ruber and on benthic foraminifera Cibicidoides wuellerstorfi, Cibicidoides pachyderma and Uvigerina peregrina from MD77-191 to produce the most complete records. Mg/Ca, Sr/Ca, U/Ca and Li/Ca ratios were measured in shells of the aragonite epi-faunal benthic foraminifera H. elegans from MD77-191. Only the Mg/Ca and Sr/Ca results are available for MD77-176 due to the paucity of material, and the difficulty in measuring the Li/Ca and U/Ca ratios on very small samples. Benthic foraminiferal oxygen and carbon isotopes with H. elegans trace element ratios were combined to trace the evolution of past intermediate-deep water masses in the northern Indian Ocean since the last deglaciation and constrain ocean-atmosphere exchanges during the two-stage increase in atmospheric CO2 across the last deglaciation.