Holocene variability of the Southern Hemisphere westerlies in Argentinean Patagonia (52°S) |
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| Institution: | 1. Dr. Moses Strauss Department of Marine Geosciences, Charney School of Marine Sciences, University of Haifa, Mount Carmel, 31905 Haifa, Israel;2. INGEOSUR, CONICET, Departamento de Geología, Universidad Nacional del Sur, B8000ICN Bahía Blanca, Argentina;3. Section of Earth & Environmental Sciences, University of Geneva, 1205 Geneva, Switzerland;4. Lamont-Doherty Earth Observatory, Columbia University, Palisades, New York 10964, NY, USA;5. Departamento de Biodiversidad y Biología Experimental, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, C1428EHA Buenos Aires, Argentina;6. Institute for Geophysics, John A. and Katherine G. Jackson School of Geosciences, University of Texas at Austin, TX 78758, USA;7. Institute of Geological Sciences and Oeschger Centre for Climate Change Research, University of Bern, 3012 Bern, Switzerland;8. Geology Department, University of Otago, 9054 Otago, New Zealand |
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| Abstract: | High-resolution analyses of allochthonous pollen input into crater lake sediments of Laguna Potrok Aike in the semi-arid Patagonian steppe reflect the variability of zonal wind intensities during the Holocene at 52° southern latitude. These indicators for Southern Hemisphere westerlies (SHW) strength vary on centennial timescales in concert with carbon/nitrogen (C/N) ratios and titanium (Ti) contents, interpreted as differential organic matter sources and minerogenic input to the sediment, respectively. The correlations underline a linkage between hydrological variability and west wind variability in Extra-Andean Patagonia. A shift to generally more intense SHW suggests intensification towards modern wind conditions at that latitude since 9.2 ka cal BP. |
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