Precipitation variations and possible forcing factors on the Northeastern Tibetan Plateau during the last millennium |
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| Institution: | 1. MOE Key Laboratory of Western China''s Environmental Systems, Collaborative Innovation Centre for Arid Environments and Climate Change, Lanzhou University, Lanzhou 73000, China;2. State Key Laboratory of Cryospheric Sciences, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China;3. Department of Earth Science, University of Bergen, N-5007 Bergen, Norway;4. Bjerknes Centre for Climate Research, N-5007 Bergen, Norway;1. Department of Vegetation Ecology, Institute of Botany, Academy of Sciences of the Czech Republic, Lidická 25/27, CZ-602 00 Brno, Czech Republic;2. Department of Botany and Zoology, Faculty of Science, Masaryk University, Kotlá?ská 2, CZ-61137 Brno, Czech Republic;1. The Fredy and Nadine Herrmann Institute of Earth Sciences, The Hebrew University of Jerusalem, Edmond J. Safra Campus Givat Ram, Jerusalem 91904, Israel;2. CEREGE, UMR 6635 CNRS-Aix-Marseille University, BP 80, 13 545 Aix en Provence Cedex 4, France;3. Geological Survey of Israel, 30 Malkhe Israel St., Jerusalem 95501, Israel;4. Department of Geography, The Hebrew University of Jerusalem, Mt. Scopus, Jerusalem 91905, Israel;5. Center for Accelerator Mass Spectrometry, Lawrence Livermore National Laboratory, Livermore, CA 94511, USA;1. Soil Geography and Landscape Group, Wageningen University, P.O. Box 47, NL-6700 AA, Wageningen, The Netherlands;2. Instituto Universitario de Geologia, Edificio de Servicios Centrales de Investigacion, Campus de Elviña, University of A Coruña, 15071 A Coruña, Spain;3. Facultad de Humanidades, University of Santiago de Compostela, Spain;4. ITC Faculty of Geo-Information Science and Earth Observation, University of Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands;1. Florida Museum of Natural History, University of Florida, Gainesville, FL 32611, USA;2. School of Earth Sciences & Environmental Sustainability, Northern Arizona University, Flagstaff, AZ 86011, USA;3. Geosciences Institute, Johannes Gutenberg University, Johann-Joachim-Becher-Weg 21, Mainz 55128, Germany;4. Rubicon Geological Consultants, 1690 Sharkey Rd., Morehead, KY 40351, USA;5. Instituto de Biociências, Universidade Estadual Paulista, Distrito de Rubião Junior, CP. 510, 18618-970 Botucatu, Brazil;6. Department of Geological Sciences, University of Missouri, Columbia, MO 65211, USA;7. Department of Geology, University of Cincinnati, Cincinnati, OH 45221, USA;8. Department of Earth and Environmental Sciences, University of Kentucky, Lexington, KY 40506, USA;1. Instituto Andaluz de Ciencias de la Tierra (CSIC-UGR), Avenida de las Palmeras 4, 18100 Armilla, Granada, Spain;2. Departamento de Mineralogia y Petrologia (UGR), Facultad de Ciencias, Campus Fuentenueva, 18002 Granada, Spain;3. NIOZ Royal Netherlands Institute for Sea Research, Department of Marine Organic Biogeochemistry, PO Box 59, AB Den Burg, 1790 Texel, The Netherlands;4. MARUM—Center for Marine Environmental Sciences, University of Bremen, P.O. Box 330440, 28334 Bremen, Germany;1. Laboratoire Chrono-Environnement, UMR 6249 CNRS, Université de Franche-Comté, 16 route de Gray, 25030 Besançon Cedex, France;2. Institut National de la Recherche Scientifique, Centre Eau Terre et Environnement, 490 rue de la Couronne, Quebec, QC G1K 9A9, Canada |
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| Abstract: | Understanding precipitation variation, drought and flood history, and their associated forcing mechanisms are important to human society. In this study, five moisture-sensitive tree-ring width chronologies are used to represent variations in precipitation over the past millennium on the Northeastern Tibetan Plateau (NETP). We find a strong coherency between chronologies in the NETP, indicating a common response to regional climate during the last millennium. The first principal component of the five chronologies (PC1) correlates significantly with regional precipitation and can thus be used as an indicator of regional precipitation variations. Dry spells, even more severe than the 1920s drought, occurred during AD 1139–1152, 1294–1309, 1446–1503 and 1708–1726. Previous studies in this area using other proxies also identified these droughts. Multi-Taper spectral analysis demonstrates significant periodicities at 205 yr and 73 yr, plus a range of ~ 2 yr cycles, suggesting possible linkage with solar variation and the Pacific Decadal Oscillation (PDO). PC1 also shows coherent patterns with solar irradiance variation: the precipitation tends to reach low values during the well-known solar minimum. |
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