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

TitleSynchronous volcanic eruptions and abrupt climate change similar to 17.7 ka plausibly linked by stratospheric ozone depletion
Publication TypeJournal Article
Year of Publication2017
AuthorsMcConnell J.R, Burke A., Dunbar N.W, Kohler 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 JP, Steffensen J.P, Taylor K.C, Winckler G.
JournalProceedings of the National Academy of Sciences of the United States of America
Volume114
Pagination10035-10040
Date Published2017/09
Type of ArticleArticle
ISBN Number0027-8424
Accession NumberWOS:000411157100044
Keywordsaerosol; carbon-dioxide; circulation; climate; deglaciation; dust; ice core; impact; last glacial maximum; new-zealand; ozone; sea-ice; southern-ocean; volcanism; west antarctica
Abstract

Glacial-state greenhouse gas concentrations and Southern Hemisphere climate conditions persisted until similar to 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, similar to 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 similar to 17.7 ka.

DOI10.1073/pnas.1705595114
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