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Dry/wet variations in the eastern Tien Shan (China) since AD 1725 based on Schrenk spruce (Picea schrenkiana Fisch. et Mey) tree rings |
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| Affiliation: | 1. The State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi''an 710061, China;2. The University of the Chinese Academy of Science, Beijing 100049, China;3. Department of Environmental Science and Technology, School of Human Settlements and Civil Engineering, Xi''an Jiaotong University, Xi''an 710049, China;4. Joint Center for Global Change Studies (JCGCS), Beijing Normal University, Beijing 100875, China |
| Abstract: | Cores of Schrenk spruce from seven sites of eastern Tien Shan were used to develop a regional tree-ring chronology to extend the climate record. We developed an August–July Standardized Precipitation Evapotranspiration Index (SPEI) reconstruction that spans AD 1725–2013 based on the regional tree-ring chronology. The reconstruction model accounts for 45.3% of the SPEI variance from 1959 to 2013. The SPEI reconstruction agrees reasonably well with the dry and wet periods previously estimated from tree rings in northern Xinjiang. The correlation analysis revealed that temperature plays an important role in regional drought variability, and some extreme wet years also coincide with the volcanic eruptions. |
| Keywords: | Dendroclimatology Northern Xinjiang SPEI reconstruction Drought events Natural forcings |
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