Synchronous volcanic eruptions and abrupt climate change ~17.7 ka plausibly linked by stratospheric ozone depletion
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Synchronous volcanic eruptions and abrupt climate change ~17.7 ka plausibly linked by stratospheric ozone depletion. / McConnell, Joseph R.; Burke, Andrea; Dunbar, Nelia W.; Köhler, Peter; Thomas, Jennie L.; Arienzo, Monica M.; Chellman, Nathan J.; Maselli, Olivia J.; Sigl, Michael; Adkins, Jess F.; Baggenstos, Daniel; Burkhart, John F.; Brook, Edward J.; Buizert, Christo; Cole-Dai, Jihong; Fudge, T. J.; Knorr, Gregor; Graf, Hans F.; Grieman, Mackenzie M.; Iverson, Nels; McGwire, Kenneth C.; Mulvaney, Robert; Paris, Guillaume; Rhodes, Rachael H.; Saltzman, Eric S.; Severinghaus, Jeffrey P.; Steffensen, Jørgen Peder; Taylor, Kendrick C.; Winckler, Gisela.
I: Proceedings of the National Academy of Sciences of the United States of America, Bind 114, Nr. 38, 2017, s. 10035-10040.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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TY - JOUR
T1 - Synchronous volcanic eruptions and abrupt climate change ~17.7 ka plausibly linked by stratospheric ozone depletion
AU - McConnell, Joseph R.
AU - Burke, Andrea
AU - Dunbar, Nelia W.
AU - Köhler, Peter
AU - Thomas, Jennie L.
AU - Arienzo, Monica M.
AU - Chellman, Nathan J.
AU - Maselli, Olivia J.
AU - Sigl, Michael
AU - Adkins, Jess F.
AU - Baggenstos, Daniel
AU - Burkhart, John F.
AU - Brook, Edward J.
AU - Buizert, Christo
AU - Cole-Dai, Jihong
AU - Fudge, T. J.
AU - Knorr, Gregor
AU - Graf, Hans F.
AU - Grieman, Mackenzie M.
AU - Iverson, Nels
AU - McGwire, Kenneth C.
AU - Mulvaney, Robert
AU - Paris, Guillaume
AU - Rhodes, Rachael H.
AU - Saltzman, Eric S.
AU - Severinghaus, Jeffrey P.
AU - Steffensen, Jørgen Peder
AU - Taylor, Kendrick C.
AU - Winckler, Gisela
PY - 2017
Y1 - 2017
N2 - 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.
AB - 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.
KW - Aerosol
KW - Climate
KW - Deglaciation
KW - Ozone
KW - Volcanism
U2 - 10.1073/pnas.1705595114
DO - 10.1073/pnas.1705595114
M3 - Journal article
C2 - 28874529
AN - SCOPUS:85029570851
VL - 114
SP - 10035
EP - 10040
JO - Proceedings of the National Academy of Sciences of the United States of America
JF - Proceedings of the National Academy of Sciences of the United States of America
SN - 0027-8424
IS - 38
ER -
ID: 196345124