2004~2007年在天山奎屯河哈希勒根51号冰川采集3个雪坑样品。运用相关分析、海盐示踪法等方法,对化学要素的季节变化特征及主要阴阳离子来源进行分析研究。结果表明,雪坑中不溶粉尘和主要化学离子具有明显的季节变化特征;春季期间降雪中粉尘浓度明显高于其他季节。主要离子的浓度在沙尘季节也明显高于非沙尘季节。雪坑中Ca2+是主要阳离子,SO42-是主要阴离子。除NO3-外,雪坑中其他离子浓度之间均存在较好正相关。表明冰川区主要受中亚地区沙尘活动影响;同时雪坑中的离子(尤其是Na+)除陆源矿物粉尘之外,一定程度源于海洋源。
Snow chemistry on the glaciers of high mountains is good indicator for atmospheric environment change research. During the summer of the years from 2004 to 2007, we measured the characteristics of snow chemistry in three snowpits of different altitudes on the Haxilegen glacier No.51 of Kuytun, the eastern Tianshan Mountains of China. Correlation analysis and sea-salt tracing methods were used in this study to find out the source of major ions and dust particles. Results showed that the insoluble dust micro-particles and major ions in the snow had obvious seasonal variation. During Asian dust period, the concentration was significantly high, but the concentration was relatively low during non-dust period, which may be caused by dust activities of central Asia. The major ionic concentration was Ca2+>SO42->NH4+>NO3-> Cl-> Na+>Mg2+>K+, Ca2+ was the dominate cation, and SO42- was the dominate anion. The ionic correlation coefficient analysis shows that all the ions have very good correlation coefficient except the NO3-. The glacier regions was mainly affected by dust activities. Moreover, the major ions, especially Na+, was significantly affected by the Ocean in the west, as the precipitation was mainly from the west, besides those partly originated from the dust sources of central Asian region.
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