Acta Geographica Sinica ›› 2014, Vol. 69 ›› Issue (5): 681-689.doi: 10.11821/dlxb201405011

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Variations of the alpine precipitation during 1960-2006 recorded in Laohugou ice core in western Qilian Mountains, China

QIN Xiang1, CUI Xiaoqing1, DU Wentao1, REN Jiawen1, CHEN Jizu1,2   

  1. 1. State Key Laboratory of Cryospheric Sciences/Qilian Mountain Glacier and Ecological Environment Research Station, CAS, Lanzhou 730000, China;
    2. College of Earth and Environmental Sciences, Lanzhou University, Lanzhou 730000, China
  • Received:2013-06-18 Revised:2014-01-15 Online:2014-05-20 Published:2014-05-20
  • Supported by:
    National Basic Research Program of China(973 Program), No.2013CBA01801;National Natural Science Foundation of China, No.41371091;No.41201067;No.41301064;The State Key Laboratory of Cryospheric Sciences, No.SKLCS-ZZ-2012-01-05

Abstract: 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 in 2006 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 50 years, 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.

Key words: Laohugou Glacier No.12, Qilian Mountains, alpine precipitation, ice core