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- W2043358023 abstract "Abstract Paleonutrient proxies are widely used to reconstruct the geometry of deep-water masses during the Last Glacial Maximum (LGM). Epibenthic δ 13 C provides best spatial coverage, and artifacts are well investigated. Discrepancies between reconstructed LGM-circulation patterns derived from models or different benthic nutrient proxies can partly be resolved by varying air–sea signatures of δ 13 C, i.e. δ 13 C as . However, there are very few data available to calculate a δ 13 C as of modern bottom water dissolved inorganic carbon (DIC) δ 13 C, and to document how this signal is recorded in benthic foraminiferal δ 13 C. Here I show that today bottom water in the Atlantic sector of the Southern Ocean is 13 C enriched with δ 13 C DIC values between 0.4 and 1.0‰ and δ 13 C as values > 0.4‰, and that this signal is recorded in live and dead epibenthic δ 13 C. This is in contrast to a uniform modern Antarctic circumpolar δ 13 C DIC of rather 0.4‰, which hitherto is used as modern framework to compare to low LGM δ 13 C DIC of southern sourced bottom-water and glacial inter basin differences. I conclude that a potential reduction of the strong Recent thermodynamic imprint during bottom-water generation in glacial times could explain depleted circum Antarctic 13 C DIC without associated CO 2 enrichment and anoxia in Antarctic bottom waters. The present synoptic compilation of δ 13 C DIC and live benthic foraminifera δ 13 C is in support of hypotheses that explain low LGM δ 13 C by a depletion of southern end-member 13 C DIC due to extensive sea-ice formation with low δ 13 C as -brine rejection and diminished air–sea gas exchange." @default.
- W2043358023 created "2016-06-24" @default.
- W2043358023 creator A5033425589 @default.
- W2043358023 date "2012-02-01" @default.
- W2043358023 modified "2023-10-16" @default.
- W2043358023 title "Strong thermodynamic imprint on Recent bottom-water and epibenthic δ13C in the Weddell Sea revealed: Implications for glacial Southern Ocean ventilation" @default.
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- W2043358023 doi "https://doi.org/10.1016/j.epsl.2011.11.030" @default.
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