High-Precision 10Be Chronology of Moraines in the Southern Alps Indicates Synchronous Cooling in Antarctica and New Zealand 42,000 Years Ago ∗ Samuel E
Earth and Planetary Science Letters 405 (2014) 194–206 Contents lists available at ScienceDirect Earth and Planetary Science Letters www.elsevier.com/locate/epsl High-precision 10Be chronology of moraines in the Southern Alps indicates synchronous cooling in Antarctica and New Zealand 42,000 years ago ∗ Samuel E. Kelley a, ,1, Michael R. Kaplan b, Joerg M. Schaefer b, Bjørn G. Andersen c,2, David J.A. Barrell d, Aaron E. Putnam b, George H. Denton a, Roseanne Schwartz b, Robert C. Finkel e, Alice M. Doughty f a Department of Earth Sciences and Climate Change Institute, University of Maine, Orono, ME 04469, USA b Lamont–Doherty Earth Observatory, Palisades, NY 10964, USA c Department of Geosciences, University of Oslo, Oslo, Norway d GNS Science, Dunedin, New Zealand e Lawrence Livermore National Laboratory, Livermore, CA 94550, USA f Department of Earth Sciences, Dartmouth College, Hanover, NH 03750, USA a r t i c l e i n f o a b s t r a c t Article history: Millennial-scale temperature variations in Antarctica during the period 80,000 to 18,000 years ago are Received 13 July 2013 known to anti-correlate broadly with winter-centric cold–warm episodes revealed in Greenland ice Received in revised form 22 July 2014 cores. However, the extent to which climate fluctuations in the Southern Hemisphere beat in time with Accepted 25 July 2014 Antarctica, rather than with the Northern Hemisphere, has proved a controversial question. In this study Available online 16 September 2014 we determine the ages of a prominent sequence of glacial moraines in New Zealand and use the results Editor: G.M.
[Show full text]