Drought reconstruction in the Qilian Mountains over the last two centuries and its implications for large-scale moisture patterns |
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| Authors: | Wenhuo Liu Xiaohua Gou Meixue Yang Yong Zhang Keyan Fang Tao Yang Liya Jin |
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| Institution: | Key Laboratory of Western China's Environmental Systems, Ministry of Education, Lanzhou University, Lanzhou 730000,Key Laboratory of Western China's Environmental Systems, Ministry of Education, Lanzhou University, Lanzhou 730000,Key Laboratory of Cyrosphere and Environmment, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000,Key Laboratory of Western China's Environmental Systems, Ministry of Education, Lanzhou University, Lanzhou 730000},Key Laboratory of Western China's Environmental Systems, Ministry of Education, Lanzhou University, Lanzhou 730000,Key Laboratory of Western China's Environmental Systems, Ministry of Education, Lanzhou University, Lanzhou 730000,Key Laboratory of Western China's Environmental Systems, Ministry of Education, Lanzhou University, Lanzhou 730000 |
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| Abstract: | We present a composite tree-ring chronology from two sites of Qilian Juniper (Sabina przewalskii)
in the northwestern Qilian Mountains (QM), Northwestern China. Precipitation in June was found to be the main
limiting factor for tree-growth. The tree rings are also significantly and positively correlated with June
precipitation over large areas of the northern Tibetan Plateau (TP). The authors thus consider that the tree-ring
based drought reconstruction from 1803--2006 is representative of a large area drought history. During the
reconstruction period, persistent and severe dry epochs occurred in the 1820s--1830s, 1870s--1880s, 1920s,
and 1950s--1960s, and persistent wet periods were found from 1803--1810s, 1890s--1920s, and 1970s--1980s. The
severe dry and wet periods are similar to those found over the northeastern TP, indicating the potential linkages
of the drought regimes between them. Comparison with global SST indicates that the drought variability is closely
related to the tropical Pacific and Arctic Ocean SSTs, suggesting the connection of regional moisture variations
to the Asian monsoon and westerly belt circulations, respectively. |
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| Keywords: | drought variability tree rings SST Qilian Mountains |
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