Synchronous volcanic eruptions and abrupt climate change ~17.7k years ago plausibly linked by stratospheric ozone depletion
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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.
McConnell , J R , Burke , A , Dunbar , N W , Köhler , P , Thomas , J L , Arienzo , M M , Chellman , N J , Maselli , O J , Sigl , M , Adkins , J F , Baggenstos , D , Burkhart , J F , Brook , E J , Buizert , C , Cole-Dai , J , Fudge , T J , Knorr , G , Graf , H-F , Grieman , M M , Iverson , N , McGwire , K C , Mulvaney , R , Paris , G , Rhodes , R H , Saltzman , E S , Severinghaus , J P , Steffensen , J P , Taylor , K C & Winckler , G 2017 , ' Synchronous volcanic eruptions and abrupt climate change ~17.7k years ago plausibly linked by stratospheric ozone depletion ' Proceedings of the National Academy of Sciences of the United States of America , vol Early Edition . DOI: 10.1073/pnas.1705595114
Proceedings of the National Academy of Sciences of the United States of America
© 2017, the Author(s). This work has been made available online in accordance with the publisher’s policies. This is the author created accepted version manuscript following peer review and as such may differ slightly from the final published version. The final published version of this work is available at https://doi.org/10.1073/pnas.1705595114© 2017, the Author(s). This work has been made available online in accordance with the publisher’s policies. This is the author created accepted version manuscript following peer review and as such may differ slightly from the final published version. The final published version of this work is available at https://doi.org/10.1073/pnas.1705595114
The US National Science Foundation supported this work [Grants 0538427, 0839093, and 1142166 (to J.R.M.); 1043518 (to E.J.B.); 0538657 and 1043421 (to J.P. Severinghaus); 0538553 and 0839066 (to J.C.-D.); and 0944348, 0944191, 0440817, 0440819, and 0230396 (to K.C.T.)]. We thank the WAIS Divide Science Coordination Office and other support organizations. P.K. and G.K. were funded by Polar Regions and Coasts in a Changing Earth System-II, with additional support from the Helmholtz Climate Initiative. The data reported in this work have been deposited with the U.S. Antarctic Program Data Center, www.usap-dc.org/view/dataset/601008.
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