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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. M., 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, 13(1). (doi:10.1038/s41467-022-33166-3) Keywords Antarctica Taylor Glacier