Chemical characteristics and influencing factors of snow in eastern Qilian Mountains, China Chemical characteristics and influencing factors of snow in eastern Qilian Mountains, China

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Vol16 No.9: 2015-2027

Title】Chemical characteristics and influencing factors of snow in eastern Qilian Mountains, China

Author】HE Hong-ze1; LIU Xue-lu1*; ZHU Guo-feng2

Addresses】1 College of Resources and Environmental Sciences, Gansu Agricultural University, Lanzhou 730070, China; 2 State Key Laboratory of Cryosphere Science, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730070, China

Corresponding author】LIU Xue-lu

Citation】He HZ, Liu XL, Zhu GF (2019) Chemical characteristics and influencing factors of snow in eastern Qilian Mountains, China. Journal of Mountain Science 16(9). https://doi.org/10.1007/s11629-018-5068-1

DOI】https://doi.org/10.1007/s11629-018-5068-1

Abstract】As an important indicator of environmental and climate changes, snow chemical properties can be used to reflect microcosmic changes, large-scale environmental and climate changes. 174 groups of snow samples were collected from four different rivers, Jinta river, Sishui river, Binggou river, and Nancha river, in the eastern Qilian Mountains in west China from May 2014 to October 2017. The characteristics of inorganic ions, Ca2+, Mg2+, Na+, K+, Cl, NO3, HCO3-, and SO2, in the samples were analyzed by Dionex-600and Dionex-3000 ion chromatograph. The results show that Ca2+ is the main cation, while HCO3-is the main anion; the ion concentration of snow is higher than that of rain. After careful analysis, we draw the conclusion that due to the controlling of the westerly wind, the atmosphere of the Qilian Mountains is dry with high dust content in winter and spring, which makes the ions in the snow mainly derive from the weathering of carbonate rock and sulfate rock. The ions in snow cover mainly come from land-sourced dust, while less contribution is from marine sources and human activities.

Keywords】Qilian Mountains; Snow cover; Ion; Dust activity; Water vapor transport; Rock lithology