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Taylor Glacier CO2 Isotope Data 74-59 kyr Data DOI: https://doi.org/10.15784/601600 Cite as Menking, J., Barker, S., Bauska, T., Brook, E. J., Buffen, A., Dyonisius, M., et al. (2022) "Taylor Glacier CO2 Isotope Data 74-59 kyr" U.S. Antarctic Program (USAP) Data Center. doi: https://doi.org/10.15784/601600. AMD - DIF Record(s) NSF-ANT12-45821_1 USAP-1245659_1 Abstract High-precision carbon isotope data (d13C-CO2) show atmospheric CO2 during Marine Isotope Stage 4 (MIS 4, ~70.5-59 ka) was controlled by a succession of millennial-scale processes. Enriched d13C-CO2 during peak glaciation suggests increased ocean carbon storage. Variations in d13C-CO2 in early MIS4 suggest multiple processes were active during CO2 drawdown, potentially including decreased land carbon and decreased Southern Ocean air-sea gas exchange superposed on increased ocean carbon storage. CO2 remained low during MIS 4 while d13C-CO2 fluctuations suggest changes in Southern Ocean and North Atlantic air-sea gas exchange. A 7 ppm increase in CO2 at the onset of Dansgaard-Oeschger event 19 (72.1 ka) and a 22 ppm increase in CO2 during late MIS 4 (Heinrich Stadial 6, ~63.5-60 ka) involved additions of isotopically light carbon to the atmosphere. The terrestrial biosphere and Southern Ocean air-sea gas exchange are possible sources, with the latter event also involving decreased ocean carbon storage. Creator(s): Menking, James; Shackleton, Sarah; Bauska, Thomas; Buffen, Aron; Brook, Edward J.; Barker, Stephen; Severinghaus, Jeffrey P.; Dyonisius, Michael; Petrenko, Vasilii Date Created: 2022-08-23 Repository: USAP-DC (current) License: Creative Commons Attribution Only v4.0 Generic [CC BY 4.0] Spatial Extent(s) West: 161, East: 162, South: -77.8, North: -77.7 Award(s) NSF 1245659 NSF 1245821 NSF 1246148 Version: 1 Related Project(s) Collaborative Research: The Taylor Glacier, Antarctica, Horizontal Ice Core: Exploring changes in the Natural Methane Budget in a Warming World and Expanding the Paleo-archive References Menking, J.A., Shackleton, S.A., Bauska, T.K., Buffen, A., Brook, E.J., Barker, S., Severinghaus, J.P., Dyonisius, M.N., Petrenko, V.V., 2022, Multiple carbon cycle mechanisms associated with the glaciation of Marine Isotope Stage 4, Nature Communications, accepted. Keywords Antarctica Taylor Glacier