Sampling strategy and climatic implications of tree-ring stable isotopes on the southeast Tibetan Plateau |
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| Authors: | Chunming Shi Valérie Masson-Delmotte Camille Risi Thomas Eglin Michel Stievenard Monique Pierre Xiaochun Wang Jing Gao François-Marie Bréon Qi-Bin Zhang Valérie Daux |
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| Institution: | 1. State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi''an 710061, China;2. Joint Center for Global Change Studies (JCGCS), Beijing 100875, China;3. School of Human Settlements and Civil Engineering, Xi''an Jiaotong University, Xi''an 710049, China;4. Research Institute of Humanity and Nature, 457-4 Motoyama, Kamigamo, Kita-ku, Kyoto 603-8047, Japan;5. Department of Geography, University of Wales Swansea, Swansea, SA2 8PP, UK;6. Environmental Science and Engineering Collage, Chang''an University, Xi''an 710054, China;7. Nature Reserve Administration of Xinglong Mountain, Lanzhou 730100, China;1. National Climate Centre, China Meteorological Administration, Beijing 100081, China;2. Gothenburg University Laboratory for Dendrochronology, Department of Earth Sciences, University of Gothenburg, Gothenburg SE-405 30, Sweden;3. Key Laboratory of Land Surface Pattern and Simulation, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China;1. Key Laboratory of Land Surface Pattern and Simulation, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China;2. University of Chinese Academy of Sciences, Beijing 100049, China;3. Key Laboratory of Tropical Forest Ecology, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Kunming 650223, China |
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| Abstract: | We explore the potential of tree-ring cellulose δ18O and δ13C records for reconstructing climate variability in the southeast Tibetan Plateau. Our sampling strategy was designed to investigate intra and inter-tree variability, and the effects of the age of tree on δ18O variation. We show that intra-tree δ13C and δ18O variability is negligible, and inter-tree coherence is sufficient to build robust tree-ring δ18O or δ13C chronologies based on only four trees. There is no evidence of an age effect regarding δ18O, in contrast with tree-ring width. In our warm and moist sampling site, young tree δ13C is not clearly correlated with monthly mean meteorological data. Tree-ring δ18O appears significantly anti-correlated with summer precipitation amount, regional cloud cover, and relative humidity. Simulations conducted with the ORCHIDEE land surface model confirm the observed contribution of relative humidity to tree cellulose δ18O, and explain the weak correlation of δ13C with climate by the non-linear integration linked with photosynthesis. Altogether, the tree-ring cellulose δ18O is shown to be a promising proxy to reconstruct regional summer moisture variability prior to the instrumental period. |
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