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Title: A tree-ring cellulose δ<sup>18</sup>O-based July-October precipitation reconstruction since AD 1828, northwest Thailand
Authors: Chenxi Xu
Nathsuda Pumijumnong
Takeshi Nakatsuka
Masaki Sano
Zhen Li
National Institutes for the Humanities, Research Institute for Humanity and Nature
Faculty of Environment and Resource Studies, Mahidol University
Nagoya University
Keywords: Environmental Science
Issue Date: 1-Oct-2015
Citation: Journal of Hydrology. Vol.529, No.P2 (2015), 433-441
Abstract: © 2015 Elsevier B.V. A tree-ring δ18O chronology for the period 1828-2000 was developed from four Pinus merkusii trees, to find a reliable proxy for reconstructing precipitation in northwest Thailand. Inter-tree δ18O correlations were high during the entire period (r=0.57-0.79). The tree-ring δ18O chronology shows significant negative correlations with regional July-October precipitation during the period 1901-2000 (r=-0.62) and with July-October river flow (r=-0.54), and is in good agreement with a shorter tree-ring δ18O chronology from living Pinus kesiya in northwest Thailand. The spatial correlation analysis between tree-ring δ18O and regional July-October precipitation also support that the tree-ring δ18O of P. merkusii is a promising proxy to reconstruct precipitation in northwest Thailand. The tree-ring δ18O-based July-October reconstruction, which accounts for 37.6% of the precipitation variance, shows a close relationship with El Niño-Southern Oscillation (ENSO) during the period 1871-2000, with the exception of during the past two decades; the exception may be related to the southeastward shift of the descending limb of Walker circulation and increased frequency of central Pacific ENSO.
ISSN: 00221694
Appears in Collections:Scopus 2011-2015

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