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• W3008897423 abstract "Abstract It is widely assumed that the ventilation of the Southern Ocean played a crucial role in driving glacial‐interglacial atmospheric CO 2 levels. So far, however, ventilation records from the Indian sector of the Southern Ocean are widely missing. Here we present reconstructions of water residence times (depicted as ΔΔ 14 C and Δδ 13 C) for the last 32,000 years on sediment records from the Kerguelen Plateau and the Conrad Rise (~570‐ to 2,500‐m water depth), along with simulated changes in ocean stratification from a transient climate model experiment. Our data indicate that Circumpolar Deep Waters in the Indian Ocean were part of the glacial carbon pool. At our sites, close to or bathed by upwelling deep waters, we find two pulses of decreasing ΔΔ 14 C and δ 13 C values (~21–17 ka; ~15–12 ka). Both transient pulses precede a similar pattern in downstream intermediate waters in the tropical Indian Ocean as well as rising atmospheric CO 2 values. These findings suggest that 14 C‐depleted, CO 2 ‐rich Circumpolar Deep Water from the Indian Ocean contributed to the rise in atmospheric CO 2 during Heinrich Stadial 1 and also the Younger Dryas and that the southern Indian Ocean acted as a gateway for sequestered carbon to the atmosphere and tropical intermediate waters." @default.
• W3008897423 created "2020-03-06" @default.
• W3008897423 creator A5044639311 @default.
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• W3008897423 date "2020-03-01" @default.
• W3008897423 modified "2023-10-09" @default.
• W3008897423 title "Radiocarbon Evidence for the Contribution of the Southern Indian Ocean to the Evolution of Atmospheric CO₂ Over the Last 32,000 Years" @default.
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• W3008897423 doi "https://doi.org/10.1029/2019pa003733" @default.
• W3008897423 hasPublicationYear "2020" @default.
• W3008897423 type Work @default.
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