The last interglacial as represented in the glaciochemical record from Mount Moulton Blue Ice Area,West Antarctica |
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| Authors: | Elena V Korotkikh Paul A Mayewski Michael J Handley Sharon B Sneed Douglas S Introne Andrei V Kurbatov Nelia W Dunbar William C McIntosh |
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| Institution: | 1. Department of Earth Sciences, University of Bristol, Wills Memorial Building, Bristol, BS81RJ, UK;2. Centre for Geographical Studies, Institute of Geography and Spatial Planning, University of Lisbon, Lisbon, Portugal;3. Dept. Géographie & Centre d’études nordiques, Université Laval, Quebec, Canada;4. Institute of Earth Sciences Jaume Almera, ICTJA-CSIC, Lluis Solé i Sabaris s/n, 08028 Barcelona, Spain;5. Centro de Investigación, Seguimiento y Evaluación, Parque Nacional de la Sierra de Guadarrama, Rascafría (Madrid), Spain;6. Centre for Ecological Research and Forestry Applications (CREAF-CSIC), Cerdanyola del Vallès, Catalonia, Spain;7. Centre for Hydrographical Studies (CEDEX), Madrid, Spain |
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| Abstract: | Understanding climate during the last interglacial is critical for understanding how modern climate change differs from purely naturally forced climate change. Here we present the first high-resolution ice core record of the last interglacial and transition to the subsequent glacial period from Antarctica and the first glaciochemical record for this period from West Antarctica. Samples were collected from a horizontal ice trench in the Mt. Moulton Blue Ice Area (BIA) in West Antarctica and analyzed for their soluble major anions (Cl?, NO3?, SO42-), major and trace elements (Na, Mg, Ca, Sr, Cd, Cs, Ba, La, Ce, Pr, Pb, Bi, U, As, Al, S, Ti, V, Cr, Mn, Fe, Co, Cu, Zn) and water hydrogen isotopes (δD). The last interglacial is characterized by warmer temperatures (δD), weakened atmospheric circulation (dust elements, seasalts aerosols), decreased sea ice extent (Na, nssSO42-) and decreased oceanic productivity (nssSO42-). A combined examination of Mt. Moulton seasalts, dust, nssSO42- and δD records indicates that the last interglacial was extremely stable compared to glacial age climate events and it ended through a long period of gradual cooling unlike that projected for future Holocene climate. |
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