Integration of Tibetan Plateau ice-core temperature records and the influence of atmospheric circulation on isotopic signals in the past century |
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| Institution: | 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. 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, Kotlářská 2, CZ-61137 Brno, Czech Republic;1. Paleoecological Environmental Assessment and Research Laboratory (PEARL), Department of Biology, Queen''s University, Kingston, Ontario K7L3N6, Canada;2. Department of Biology, University of Regina, Laboratory Building, Saskatchewan S4S0A2, Canada;1. MOE Key Laboratory of West China''s Environmental System, Research School of Arid Environment and Climate Change, Lanzhou University, Lanzhou 730000, China;2. Key Laboratory of Desert and Desertification, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China;1. State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi''an 710075, China;2. Resources & Chemical Laboratory, Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Lanzhou 730000, China |
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| Abstract: | Temperature signals in ice-core δ18O on the Tibetan Plateau (TP), particularly in the central and southern parts, continue to be debated because of the large scale of atmospheric circulation. This study presents ten ice-core δ18O records at an annual resolution, with four (Malan, Muztagata, Guliya, and Dunde) in the northern, three (Puruogangri, Geladaindong, Tanggula) in the central and three (Noijin Kangsang, Dasuopu, East Rongbuk) in the southern TP. Integration shows commonly increasing trends in δ18O in the past century, featuring the largest one in the northern, a moderate one in the central and the smallest one in the southern TP, which are all consistent with ground-based measurements of temperature. The influence of atmospheric circulation on isotopic signals in the past century was discussed through the analysis of El Niño/Southern Oscillation (ENSO), and of possible connections between sea surface temperature (SST) and the different increasing trends in both ice-core δ18O and temperature. Particularly, El Niño and the corresponding warm Bay of Bengal (BOB) SST enhance the TP ice-core isotopic enrichment, while La Niña, or corresponding cold BOB SST, causes depletion. This thus suggests a potential for reconstructing the ENSO history from the TP ice-core δ18O. |
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