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《Acta Geographica Sinica》 2014-05
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Variations of the alpine precipitation during 1960-2006 recorded in Laohugou ice core in western Qilian Mountains, China

QIN Xiang;CUI Xiaoqing;DU Wentao;REN Jiawen;CHEN Jizu;State Key Laboratory of Cryospheric Sciences/Qilian Mountain Glacier and Ecological Environment Research Station,CAS;College of Earth and Environmental Sciences, Lanzhou University;  
The accumulation record of ice core is one of the most reliable indicators for reconstructing precipitation changes in high mountains. A 20.12 m ice core was drilled in2006 from the accumulation zone of Laohugou Glacier No.12 in northeast Tibetan Plateau,China. We obtained the precipitation from the ice core net accumulation during the past 50years, and found out the relationship between ice core record and other data from surrounding sites. Results showed that during 1960- 2006, the precipitation in the high mountains firstly increased and then decreased. In 1960- 2006, precipitation showed a significant increasing trend, while, from 1980 to 2006 it showed a decreasing trend. Reconstruction of the precipitation changes in the glacier was consistent with the measured data from the weather station in low mountain of Subei, and the correlation coefficient was 0.619(P 0.001);however, the magnitude in the high mountains was three times higher than that of the low mountain. The precipitation of Laohugou Glacier No.12 corresponded well to the amount of accumulation of the Dunde ice cores in the same period, tree- ring reconstruction of precipitation, the measured data of multiple meteorological stations in the northeastern Tibetan Plateau, and the changes of adjacent PDSI drought index. Precipitation changes of Laohugou Glacier and the northeastern Tibetan Plateau had significantly positive correlation with ENSO, which reflected the regional alpine precipitation change was likely to be influenced by ENSO.
【Fund】: 国家重大科学研究计划(2013CBA01801);; 国家自然科学基金(41371091 41201067 41301064);; 冰冻圈科学国家重点实验室自主课题(SKLCS-ZZ-2012-01-05)~~
【CateGory Index】: P426.6
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