Climate change over southern Qinghai Plateau in the past 500 years recorded in <Emphasis Type="Italic">Sabina tibetica</Emphasis> tree rings |
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Authors: | Ningsheng Qin Xuemei Shao Liya Jin Qingchun Wang Xide Zhu Zhenyu Wang Jinbao Li |
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Institution: | (1) Climate Date Center of Qinghai, 810001 Xining, China;(2) Institute of Geographic Sciences and Nature Resources Research, Chinese Academy of Sciences, 100101 Beijing, China;(3) Resource Environment Department of Lanzhou University, 730000 Lanzhou, China |
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Abstract: | Two tree ring-width chronologies of Sabina tibetica were developed based on cores sampled in Qumalai and Zhiduo, southern Qinghai Plateau. The response function analysis showed
that the chronologies were sensitive to temperature and precipitation from April to June in the plateau. Moisture index (MI)
was defined, reconstructed and extended back to AD 1550. The cross-validation method was used to check the stability of the
calibration equation, and the result indicated that the equation was stable. Six severe dry periods were found in this region
in the past 453-year reconstruction, which were 1592 to 1610, 1649 to 1665, 1687 to 1697, 1740 to 1750, 1818 to 1829 and 1918
to 1933. Five severe wetting periods were 1669 to 1682, 1700 to 1709, 1800 to 1814, 1898 to 1909 and 1935 to 1950. Spectrum
analysis indicated that there existed long-term cycles of 60.4 and 53.4 a, solar cycle of 11 a and short-term cycles of 8,
6 and 4 a in the reconstructed series. |
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Keywords: | southern Qinghai Plateau tree-ring chronology reconstruction moisture index |
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