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Title: A tree-ring cellulose d18O-based July–October precipitation reconstruction since AD 1828, northwest Thailand
Authors: Chenxi Xu
Nathsuda Pumijumnong
Takeshi Nakatsuka
Masaki Sano
Zhen Li
นาฎสุดา ภูมิจำนงค์
Mahidol University. Faculty of Environment and Resource Studies.
Research Institute for Humanity and Nature
Nagoya University. Graduate School of Environment Studies.
Keywords: Tree-ring cellulose oxygen isotope;Pinus merkusii;Precipitation reconstruction;ENSO
Issue Date: Oct-2015
Citation: Journal of Hydrology. Vol.259, No.P2 (2015), 433-441.
Abstract: A tree-ring d18O 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 d18O correlations were high during the entire period (r = 0.57–0.79). The tree-ring d18O 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 d18O chronology from living Pinus kesiya in northwest Thailand. The spatial correlation analysis between tree-ring d18O and regional July–October precipitation also support that the tree-ring d18O of P. merkusii is a promising proxy to reconstruct precipitation in northwest Thailand. The tree-ring d18O-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: 0022-1694
Appears in Collections:EN-Article

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