北极楚科奇海、白令海上空大气气溶胶铅浓度及同位素研究

A study on lead isotope geochemistry of atmospheric aerosol of Chukchi and Bering sea in Arctic

北极楚科奇海大气气溶胶中铅浓度为 0 1 7～ 0 96ng·m-3,平均值为 0 4 6± 0 2 7ng·m-3.气溶胶铅同位素地球化学示踪和铅的富集因子计算 ,揭示北极楚科奇海和白令海上空大气中的铅可能主要由两个端元组分混合而成 ,这两个端元一是来自北美如美国和加拿大具高同位素比值的工业释放铅 ,另一个是源于俄罗斯及其远东如立陶宛、乌克兰、阿塞拜疆、哈萨克斯坦、蒙古和亚洲如日本、韩国、中国和越南 .铅的总沉降通量计算表明 ,北极楚科奇海和白令海铅的入海通量平均值为 0 0 2mg·m-2 ·a-1 ,与南太平洋相当 ,略低于北印度洋和南大西洋 ,大大低于波罗的海、北海。

The Pb concentrations of atmospheric aerosol in the Chukchi and Berling Sea of the Arctic vary within the range of 0.17～0.96?ng·m^(-3),with an average of (0.46±0.27)?ng·m^(-3). Lead isotope and calculation of the Pb enrichment factor of aerosol indicates that the industrial sources of lead pollution include mainly the North America, East Europe and the former Soviet Union and Asia. The calculation of the total average fallout flux of Pb indicates that the mean value of input flux into the Chukpechi and Berling Sea is 0.02?mg·m^(-2)·a^(-1),equivalent to that of southern Pacific but slightly lower than that of northern Indian Sea and southern Atlantic. It is evidenced that the Pb input flux into the Chukchi and Berling Sea are far lower than that off the Baltic Sea, the North Sea and the Mediterranean Sea.