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| Titel |
A tree-ring cellulose δ18O-based July–October precipitation reconstruction since AD 1828, northwest Thailand |
| VerfasserIn |
Chenxi Xu, Nathsuda Pumijumnong, Takeshi Nakatsuka, Masaki Sano |
| Konferenz |
EGU General Assembly 2015
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 17 (2015) |
| Datensatznummer |
250104388
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| Publikation (Nr.) |
 EGU/EGU2015-3809.pdf |
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| Zusammenfassung |
| 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 Pinus 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. |
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