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Yu S.,Institute of Desert Meteorology | Yu S.,Key Laboratory of Tree ring Ecology of Uyghur Autonomous Region | Yu S.,Chemical Research of China Meteorological Administration | Yuan Y.,Institute of Desert Meteorology | And 20 more authors.
Quaternary Research (United States) | Year: 2013

Three robust tree-ring density chronologies were developed for the western Tianshan Mountains of northwestern China. The chronologies were significantly correlated and form a regional chronology (GLD). The GLD had significant and positive correlations with temperature of warm seasons. Based on this relationship, the mean minimum temperatures of May to August were reconstructed using the GLD chronology for the period AD 1657 to 2008. The temperature reconstruction exhibited temperature patterns on interannual to centennial timescales, and showed that the end of the 20th century is the warmest period in the past 352. years. The reconstructed temperature variation has a teleconnection with large-scale atmospheric-oceanic variability and captures long- and broad-scale regional climatic variations. © 2013 University of Washington.

Zhang T.,Institute of Desert Meteorology | Zhang T.,Chemical Research of China Meteorological Administration | Zhang T.,Key Laboratory of Tree ring Ecology of Uighur Autonomous Region | Yuan Y.,Institute of Desert Meteorology | And 20 more authors.
Quaternary Research (United States) | Year: 2014

August-July precipitation has been reconstructed back to AD 1724 for the Mohe region in the northern Greater Higgnan Mountains, China, using Pinus sylvestris var. mongolica tree-ring width. The reconstruction explains 39% of the variance in the precipitation observed from AD 1960-2008. Some droughts noted in historical documents are precisely captured in our reconstruction. Wet periods occurred during the periods of AD 1734-1785, AD 1805-1830, AD 1863-1880, AD 1922-1961, and AD 1983-1998; while the periods of AD 1786-1804, AD 1831-1862, AD 1881-1921, and AD 1962-1982 were relatively dry. Power spectral and wavelet analyses demonstrated the existence of significant 24-yr, 12-yr, and 2-yr. cycles of variability. The results of the spatial correlations suggest that our reconstruction contains climatic signals for the southern Stanovoy Range and the northern Greater Higgnan Mountains. The positive correlations between the new reconstructed precipitation series and two precipitation reconstructions indicate that our precipitation reconstruction captures broad-scale regional climatic variations. A comparison between the weakening tendency of summer monsoon and the dry period of our reconstruction reveals that the annual precipitation in the Mohe region is partly influenced by the East Asian Summer Monsoon. © 2014.

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