A tree-ring cellulose delta O-18-based July-October precipitation reconstruction since AD 1828, northwest Thailand

作者：Xu Chenxi^*; Pumijumnong Nathsuda; Nakatsuka Takeshi; Sano Masaki; Li Zhen

来源：Journal of Hydrology, 2015, 529: 433-441.

DOI：10.1016/j.jhydrol.2015.02.037

• Tree-ring cellulose oxygen isotope
• Pinus merkusii
• Precipitation reconstruction
• ENSO

A tree-ring delta O-18 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 delta O-18 correlations were high during the entire period (r = 0.57-0.79). The tree-ring delta O-18 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 delta O-18 chronology from living Pinus kesiya in northwest Thailand. The spatial correlation analysis between tree-ring delta O-18 and regional July-October precipitation also support that the tree-ring delta O-18 of P. merkusii is a promising proxy to reconstruct precipitation in northwest Thailand. The tree-ring delta O-18-based July-October reconstruction, which accounts for 37.6% of the precipitation variance, shows a close relationship with El Nino-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.

• 出版日期2015-10