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Zhang T.-W.,Institute of Desert Meteorology | Zhang T.-W.,Key Laboratory of Tree ring Physical and Chemical Research of China Meteorological Administration | Zhang T.-W.,Key Laboratory of Tree ring Ecology of Uighur Autonomous Region | Yuan Y.-J.,Institute of Desert Meteorology | And 25 more authors.
Quaternary International | Year: 2015

June-July mean temperature was reconstructed back to 1698 for the southern Altai Mountains in eastern Central Asia using four temperature series based on tree-ring widths. The reconstruction explains 48% of the variation in the observed temperature from 1962 to 2003. Warm periods occurred during 1714-1732, 1753-1776, 1800-1840, 1866-1886, 1893-1911, and 1943-1969, while the periods of 1708-1713, 1733-1752, 1777-1799, 1841-1865, 1887-1892, 1912-1942, and 1970-1993 were relatively cold. Power spectral and wavelet analyses demonstrated the existence of significant 50-, 14-, 2.8-, and 2.5-year cycles of variability. The results of a spatial correlation analysis suggested that this temperature reconstruction contains climatic signals for a large area of Central Asia. After employing a 21-year low-pass filter, the coherence of the newly reconstructed series with a regional temperature reconstruction for Central Asia and also with a local temperature reconstruction for the Zajsan Lake area of East Kazakhstan indicates that our temperature reconstruction captures broad-scale regional climatic variations in the low-frequency domain. © 2014 Elsevier Ltd and INQUA. Source


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 Some droughts noted in historical documents are precisely captured in our reconstruction.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. Source

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