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dc.contributor.authorNisha, Kumari
dc.contributor.authorNaik, S.S.
dc.contributor.authorKumar, Pankaj
dc.contributor.authorBanerjee, Barnita
dc.contributor.authorMurty, P.B.R.
dc.date.accessioned2023-04-12
dc.date.accessioned2023-07-17T15:32:53Z
dc.date.available2023-03-02
dc.date.available2023-07-17T15:32:53Z
dc.date.issued2023
dc.identifier.citationEarth and Planetary Science Letters, vol.607; 2023; Article no: 118067
dc.identifier.issn0012-821X
dc.identifier.otherhttps://www.sciencedirect.com/science/article/pii/S0012821X23000808
dc.identifier.urihttps://doi.org/10.1016/J.EPSL.2023.118067
dc.identifier.urihttp://drs.nio.res.in/drs/handle/2264/9053
dc.description5.785
dc.description.abstractEnhanced outgassing of sequestered carbon to the atmosphere by upwelling of deep water in the Southern Ocean during the last deglaciation is assumed to be the main factor that modulated changes in atmospheric CO2 and atmospheric radiocarbon activity; however, the exact mechanism behind this deglacial CO2 release still remains unclear. In this study, we have investigated ventilation changes in the deep waters of the northern Indian Ocean over the past 25 kyr BP using paired benthic and planktic foraminiferal radiocarbon, along with stable carbon and oxygen isotopes of benthic foraminifera, sedimentary CaCO3 content, and coarse fraction from the gravity core SSD-044/GC-01 (3160 m water depth) collected from Central Equatorial Indian Ocean. The results indicate a greater proportion of southern sourced CO2-rich, poorly-ventilated Antarctic Bottom Water (AABW) during the Last Glacial Maximum (LGM) and Heinrich Stadial (HS1), in the northern Indian Ocean. The observed poor ventilation during the last glaciation shows that the northern Indian Ocean was a part of the glacial ocean aged carbon pool. Improved ventilation during the B�lling-Aller�d (B-A) is consistent with the rapid resumption of Atlantic overturning circulation and inflow of North Atlantic Deep Water (NADW) into the northern Indian Ocean at the onset of the B-A, which caused flushing of the deep-carbon pool with evidence of degassing from the northern Indian Ocean. This study thus supports the role of Southern Ocean in modulating atmospheric CO2 variations during the last deglaciation.
dc.languageen
dc.publisherElsevier
dc.relation.isreferencedbySCI
dc.rightsOnly the author version of the copright reserved papers uploaded. Contact drs@nio.org for any complaints regarding copyright violations
dc.titleRadiocarbon evidence for reduced deep water ventilation of the northern Indian Ocean during the last glacial maxima and early deglaciation
dc.typeJournal Article
dc.affiliation.authorCSIR-National Institute of Oceanography, Dona Paula, Goa, India


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