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Sampling strategy and climatic implications of tree-ring stable isotopes on the southeast Tibetan Plateau

作 者:Shi, CM, Masson-Delmotte, V, Risi, C, Eglin, T, Stievenard, M, Pierre, M, Wang, XC, Gao, J, Breon, FM, Zhang, QB, Daux, V
影响因子: 4.062
刊物名称: Earth and Planetary Science Letters
出版年份: 2011
卷: 301  期: 1-2   页码: 307-316

文章摘要 : 

 We explore the potential of tree-ring cellulose delta O-18 and delta C-13 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 delta O-18 variation. We show that intra-tree delta C-13 and delta O-18 variability is negligible, and inter-tree coherence is sufficient to build robust tree-ring delta O-18 or delta C-13 chronologies based on only four trees. There is no evidence of an age effect regarding delta O-18, in contrast with tree-ring width. In our warm and moist sampling site, young tree delta C-13 is not clearly correlated with monthly mean meteorological data. Tree-ring delta O-18 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 delta O-18, and explain the weak correlation of delta C-13 with climate by the non-linear integration linked with photosynthesis. Altogether, the tree-ring cellulose delta O-18 is shown to be a promising proxy to reconstruct regional summer moisture variability prior to the instrumental period. (C) 2010 Elsevier B.V. All rights reserved.

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