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Zhang T.,Institute of Desert Meteorology | Zhang T.,Key Laboratory of Tree ring Physical and Chemical Research of China Meteorological Administration | Zhang T.,Key Laboratory of Tree ring Ecology of Uigur Autonomous Region | Zhang R.,Institute of Desert Meteorology | And 17 more authors.
Quaternary International | Year: 2015

July-June precipitation has been reconstructed to 1756AD for the western Tien Shan Mountains, Central Asia, using the Picea schrenkiana tree-ring width. The reconstruction explains 31% of the variation in the observed precipitation from 1933 to 2009. Some extremely dry signals in the historical documents are captured precisely in this new reconstruction. Wet periods occurred during the periods of 1811-1828, 1843-1880, 1893-1915, 1929-1934, and 1983-2002, while the periods 1766-1810, 1829-1842, 1881-1892, 1916-1928, and 1935-1982 were relatively dry. Power spectral and wavelet analyses demonstrated the existence of significant 32-, 17-, and 2.6-7.4-year cycles of variability. An assessment of spatial correlation analysis and the significant correlation coefficients between the reconstructed precipitation series and three precipitation reconstructions indicate that our reconstruction might contain multiple large-scale climatic signals in the low-frequency domain. A wetting trend in the eastern Central Asia since the 1970s decades was also captured by this reconstruction. © 2014 Elsevier Ltd and INQUA. Source

Chen F.,Institute of Desert and Meteorology | Chen F.,Key Laboratory of Tree ring Physical Chemic Research of China Meteorological Administration | Chen F.,Key Laboratory of Tree ring Ecology of Uigur Autonomous Region | Yuan Y.,Institute of Desert and Meteorology | And 23 more authors.
Shengtai Xuebao/ Acta Ecologica Sinica | Year: 2010

Using tree rings of Larix sibirica sampling from Hoboksar, we developped 21 tree-ring density and 63 tree-ring width series and then established maximum density (MXD) and annual ring width (TRW) chronologies. The detrending method of the regional curve standardization allowed us to be able to preserve inter-annual to multi-centennial scale variabilities. Having analyzed the characteristics of the chronologies and thier responding to climate factors, we found the MXD chronology correlates at 0.66 with the anomaly of maximum mean temperature in May August over the period of 1961 - 2007, which explained 43.5% of varivance in the reconstruction (F = 34.679, P < 0.0001). According the the reconstruction in Hoboksar region, the anomaly of maximum mean temperature over the 1795 - 2007 period was -0.08°C. It appeared during the 1795 - 1899 period at -0.15°C below to that in the 1900 - 2007 period. The temperature was increased from the 1880s to 1950s and indicated that maximum summer temperature since 1915 had been warmer than any periods since 1795. Source

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