The 1452 or 1453 A.D. Kuwae Eruption Signal Derived from Multiple Ice Core Records: Greatest Volcanic Sulfate Event of the Past 700 Years Chaochao Gao1, Alan Robock1, Stephen Self2, Jeffrey B.Witter3, J. P. Steffenson4, Henrik Brink Clausen4, Marie-Louise Siggaard-Andersen4, Sigfus Johnsen4, Paul A. Mayewski5, and Caspar Ammann6 1Department of Environmental Sciences, Rutgers University, New Brunswick, New Jersey, USA 2Department of Earth Sciences, The Open University, Milton Keynes, United Kingdom 3Hawaii Institute of Geophysics and Planetology, University of Hawaii at Manoa, USA 4Niels Bohr Institute, University of Copenhagen, Denmark 5Climate Change Institute, University of Maine, Orono, USA 6National Center for Atmospheric Research, Boulder, Colorado, USA Submitted to Journal of Geophysical Research September, 2005 Revised January, 2006 Corresponding Author: Chaochao Gao Department of Environmental Sciences Rutgers University 14 College Farm Road New Brunswick, NJ 08901 Phone: 732-932-3891 Fax: 732-932-8644 E-mail:
[email protected] - 1 - Abstract We combined 33 ice core records, 13 from the Northern Hemisphere and 20 from the Southern Hemisphere to determine the timing and magnitude of the Great Kuwae Eruption in the mid-15th century. We extracted volcanic deposition signals by applying a high pass loess filter to the time series and examining peaks that exceed twice the 31-yr running median absolute deviation. By accounting for the dating uncertainties associated with each record, these ice core records together reveal a large volcanogenic acid deposition event during 1453-1457 A.D. The results suggest only one major stratospheric injection from the Kuwae eruption and confirm previous findings that the Kuwae eruption took place in late 1452 or early 1453, which may serve as a reference to evaluate and improve the dating of ice core records.