Synchronous volcanic eruptions and abrupt climate change ∼17.7 ka plausibly linked by stratospheric ozone depletion

Joseph R. Mcconnell 1 Andrea Burke 2 Nelia W. Dunbar 3 Peter Köhler 4 Jennie L. Thomas 5 Monica M. Arienzo 1 Nathan J. Chellman 1 Olivia J. Maselli 1 Michael Sigl 1 Jess F. Adkins 6 Daniel Baggenstos 7 John F. Burkhart 8 Edward J. Brook 9 Christo Buizert 9 Jihong Cole-Dai 10 T. J. Fudge 11 Gregor Knorr 4 Hans-F. Graf 12 Mackenzie M. Grieman 13 Nels Iverson 3 Kenneth C. Mcgwire 14 Robert Mulvaney 15 Guillaume Paris 6 Rachael H. Rhodes 16, 9 Eric S. Saltzman 13 Jeffrey P. Severinghaus 7 Jørgen Peder Steffensen 17 Kendrick C. Taylor 1 Gisela Winckler 18
Abstract : Glacial-state greenhouse gas concentrations and Southern Hemisphere climate conditions persisted until ∼17.7 ka, when a nearly synchronous acceleration in deglaciation was recorded in paleoclimate proxies in large parts of the Southern Hemisphere, with many changes ascribed to a sudden poleward shift in the Southern Hemisphere westerlies and subsequent climate impacts. We used high-resolution chemical measurements in the West Antarctic Ice Sheet Divide, Byrd, and other ice cores to document a unique, ∼192-y series of halogen-rich volcanic eruptions exactly at the start of accelerated deglaciation, with tephra identifying the nearby Mount Takahe volcano as the source. Extensive fallout from these massive eruptions has been found >2,800 km from Mount Takahe. Sulfur isotope anomalies and marked decreases in ice core bromine consistent with increased surface UV radiation indicate that the eruptions led to stratospheric ozone depletion. Rather than a highly improbable coincidence, circulation and climate changes extending from the Antarctic Peninsula to the subtropics—similar to those associated with modern stratospheric ozone depletion over Antarctica—plausibly link the Mount Takahe eruptions to the onset of accelerated Southern Hemisphere deglaciation ∼17.7 ka.
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Joseph R. Mcconnell, Andrea Burke, Nelia W. Dunbar, Peter Köhler, Jennie L. Thomas, et al.. Synchronous volcanic eruptions and abrupt climate change ∼17.7 ka plausibly linked by stratospheric ozone depletion. Proceedings of the National Academy of Sciences of the United States of America , National Academy of Sciences, 2017, 114 (38), pp.10035-10040. ⟨10.1073/pnas.1705595114⟩. ⟨insu-01585759⟩



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