2012年6月在祁連山老虎溝12號(hào)冰川采集雪坑和表層雪樣品,結(jié)合相關(guān)分析法、海鹽示蹤法、氣團(tuán)軌跡法等方法,對(duì)冰川積雪的主要化學(xué)離子特征、來源及環(huán)境意義進(jìn)行分析研究.結(jié)果表明,積雪中平均離子濃度Ca2+>SO42->NH4+>NO3->Cl->Na+>Mg2+>K+.雪坑中Ca2+是主要的陽(yáng)離子,SO42-是主要的陰離子;各種離子在雪坑中的平均濃度要遠(yuǎn)大于表層雪,而且雪坑中的化學(xué)離子濃度峰值與污化層有著很好的對(duì)應(yīng)性.同時(shí),與青藏高原、中亞天山、阿爾泰山以及北半球其他區(qū)域高海拔雪冰化學(xué)特征進(jìn)行比較,發(fā)現(xiàn)祁連山老虎溝12號(hào)冰川區(qū)積雪化學(xué)特征受亞洲粉塵源區(qū)陸源礦物影響較大.然而,雪坑中的離子(尤其是Na+和Cl-)除了陸源礦物粉塵之外,部分還來源于海洋源.結(jié)合NOAAHysplit模型對(duì)冰川區(qū)積雪化學(xué)離子來源進(jìn)行了后向軌跡反演驗(yàn)證.

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