Concentrations, deposition rates and source variations of n-alkanes in Sofiyskiy Glacier, Russian Altai Mountains
Concentrations, deposition rates and source variations of n-alkanes in Sofiyskiy Glacier, Russian Altai Mountains
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发表时间：
2005-03
影响因子：
1
通讯作者：
T. Miyake;F. Nakazawa;M. Kohno;J. Uetake;Keisuke Suzuki;T. Kameda;Y. Fujii;M. Nakawo;K. Ohta;亀田 貴雄
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作者：
T. Miyake;F. Nakazawa;M. Kohno;J. Uetake;Keisuke Suzuki;T. Kameda;Y. Fujii;M. Nakawo;K. Ohta;亀田 貴雄
采用气相色谱法分析了俄罗斯阿尔泰山Sofiyskiy冰川雪坑和底层冰层中的雪和冰样品中的正构烷烃。样品中正构烷烃（T-HC）的总浓度范围为0.67至9.86ng g - 1。正构烷烃的年沉积通量呈季节性变化，春季高于秋季。正构烷烃的碳偏好指数（CPI）的值范围为0.95至3.35，这是相似的喜马拉雅山雪样品和城市气溶胶的报告。其中偏高的正构烷烃含量与黄土颗粒中的正构烷烃含量接近，为植物蜡的来源。3.00-7.57m和12.14-16.80m两层的非WaxCn浓度和年沉积通量均较高，表明近年来化石燃料燃烧产物等人为正构烷烃对Sofiyskiy冰川的相对贡献将有所增加。代表T-HCs中来自植物蜡的正构烷烃的一部分的WaxCn在这些样品中广泛地从7.3%到65.5%变化。很明显，在该冰川的大多数样品中，植物蜡的正构烷烃对T-HCs的贡献小于50%。
Snow and ice samples collected from a snow pit and underlying ice layers in Sofiyskiy Glacier, Russian Altai Mountains, were analyzed for n-alkanes by gas chromatography. The total concentrations of n-alkanes (T-HCs) widely ranged from 0.67 to 9.86ng g - 1 in the samples. Annual deposition fluxes of n-alkanes showed a seasonal variation with higher levels during spring than autumn. The values of carbon preference index (CPI) of n-alkanes ranged from 0.95 to 3.35, which were similar to those reported for snow samples in Himalaya and urban aerosols. The higher values among them were close to those reported of n-alkanes in loess particles, which were of plant wax origin. Both the 3.00-7.57m and the 12.14-16.80m layers had higher concentrations and annual deposition fluxes of non-WaxC n , suggesting that the relative contribution of anthropogenic n-alkanes, for example, fossil-fuel combustion products, to Sofiyskiy Glacier would increase in recent years. The WaxC n representing a portion of n-alkanes derived from plant waxes in T-HCs widely ranged from 7.3 to 65.5% in these samples. It is evident that n-alkanes of plant waxes could contribute less than 50% to T-HCs in most samples at this glacier.