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| Stott, Lowell D; Shao, Jun; Yu, Jimin; Harazin, Kathleen M. |
| The prevailing hypothesis to explain pCO2 rise at the last glacial termination calls upon enhanced ventilation of excess respired carbon that accumulated in the deep sea during the glacial. Recent studies argue lower [O2] in the glacial ocean is indicative of increased carbon respiration. The magnitude of [O2] depletion was 100–140 µ mol/kg at the glacial maximum. Because respiration is coupled to δ13C of dissolved inorganic carbon (DIC), [O2] depletion of 100–140 µ mol/kg from carbon respiration would lower deep water δ13CDIC by ∼1‰ relative to surface water. Prolonged sequestration of respired carbon would also lower the amount of 14C in the deep sea. We show that Pacific Deep Water δ13CDIC did not decrease relative to the surface ocean and Δ14C was only... |
| Tipo: Text |
Palavras-chave: Carbon isotope proxies; Carbon respiration hypothesis; Deep water ventilation; Glacial pCO2. |
| Ano: 2021 |
URL: https://archimer.ifremer.fr/doc/00682/79437/82043.pdf |
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| Stott, Lowell D. |
| There is a growing database of radiocarbon (14C) reconstructions from biogenic carbonate taken from marine sediment cores being used to investigate changing ocean circulation and carbon cycling at the end of the last great ice age. Reported here are 14C results from a marine core taken in the Makassar Straits of the western equatorial Pacific that was intended to test whether there was evidence of geologic carbon release to the ocean during the glacial termination. A thorough investigation of planktic and benthic 14C ages with stable isotopes and CT-scans revealed extensive burrowing in the upper 2 m of the core that displaced younger sediments downward by more than half a meter into the glacial section of the core. The vertical displacement is evident in... |
| Tipo: Text |
Palavras-chave: Isotope analysis; Mysterious radiocarbon anomalies. |
| Ano: 2020 |
URL: https://archimer.ifremer.fr/doc/00643/75468/76291.pdf |
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