【摘 要】
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In this study,we focus on δ18O and selected chemical constituents snow pits collected from eight glaciers in the Tibetan Plateau and adjacent areas and dis
【机 构】
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State Key Laboratory of Cryospheric Sciences,Cold and Arid Regions Environmental and Engineering Res
论文部分内容阅读
In this study,we focus on δ18O and selected chemical constituents snow pits collected from eight glaciers in the Tibetan Plateau and adjacent areas and discuss the impact of air mass transport on seasonal chemical records.Drawing on previously published data,our study summarizes the seasonal and spatial characteristics of snow chemistry and the influence of long-range transport air masses on the measured chemical concentrations in the different sites.Mean δ18O values increase generally from south to north,indicating that the influence of the Indian monsoon weakened from south to north.The overall increasing concentrations of microparticles and crustal ions from south to north indicate the strength of dust deposition on glaciers from semi-arid and arid regions..Principal component analysis and air mass trajectories suggest that chemical constituents are mainly attributable to crustal sources as demonstrated by the high concentrations of ions occurring during the non-monsoon seasons.Nevertheless,other sources,such as anthropogenic pollution,played an important role in the chemical variations in glaciers near human populations.This study concludes that air mass transportation pathways from different sources play important roles in the spatial changes and seasonality of glaciochemistry.
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