Temperature variations at Lake Qinghai on decadal scales and the possible relation to solar activities |
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| Institution: | 1. Stefan cel Mare University, Department of Geography, 13 Universit??ii Street, 720229 Suceava, Romania;2. School of Environment and Life Sciences, University of Salford, Salford, Greater Manchester M5 4WT, UK;3. Institute for Geological and Geochemical Research, Research Centre for Astronomy and Earth Sciences MTA, Budaörsi street 45, H-1112 Budapest, Hungary;4. Institute of Nuclear Physics, Polish Academy of Sciences, Radzikowskiego 152, 31-342 Krakow, Poland;5. Babe?-Bolyai University, Department of Geology, 1 M. Kogalniceanu str., Cluj-Napoca 40084, Romania;6. Biodiversity and Climate Research Centre BiK-F, 25 Senckenberganlage, D-60325 Frankfurt am Main, Germany |
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| Abstract: | Temperature variations at Lake Qinghai, northeastern Qinghai–Tibet plateau, were reconstructed based on four high-resolution temperature indicators of the δ18O and the δ13C of the bulk carbonate, total carbonate content, and the detrended δ15N of the organic matter. There are four obvious cold intervals during the past 600 years at Lake Qinghai, namely 1430–1470, 1650–1715, 1770–1820, and 1920–1940, synchronous with those recorded in tree rings at the northeast Qinghai–Tibet plateau. The intervals of 1430–1470, 1650–1715, and 1770–1820 are consistent with the three coldest intervals of the Little Ice Age. These obvious cold intervals are also synchronous with the minimums of the sunspot numbers during the past 600 years, suggesting that solar activities may dominate temperature variations on decadal scales at the northeastern Qinghai–Tibet plateau. |
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