Institute of Polar Environment, School of Earth and Space Sciences, University of Science and Technology of China, Hefei, Anhui 230026, PR China.
Environ Pollut. 2012 Jan;160(1):161-8. doi: 10.1016/j.envpol.2011.09.019. Epub 2011 Oct 18.
Historical changes of anthropogenic Pb pollution were reconstructed based on Pb concentrations and isotope ratios in lake and peat sediment profiles from Ny-Ålesund of Arctic. The calculated excess Pb isotope ratios showed that Pb pollution largely came from west Europe and Russia. The peat profile clearly reflected the historical changes of atmospheric deposition of anthropogenic Pb into Ny-Ålesund, and the result showed that anthropogenic Pb peaked at 1960s-1970s, and thereafter a significant recovery was observed by a rapid increase of (206)Pb/(207)Pb ratios and a remarkable decrease in anthropogenic Pb contents. In contrast to the peat record, the longer lake record showed relatively high anthropogenic Pb contents and a persistent decrease of (206)Pb/(207)Pb ratios within the uppermost samples, suggesting that climate-sensitive processes such as catchment erosion and meltwater runoff might have influenced the recent change of Pb pollution record in the High Arctic lake sediments.
基于来自北极的 Ny-Ålesund 的湖泊和泥炭沉积物剖面中的 Pb 浓度和同位素比值，重建了人为 Pb 污染的历史变化。计算出的过剩 Pb 同位素比值表明，Pb 污染主要来自西欧和俄罗斯。泥炭剖面清楚地反映了人为 Pb 通过大气沉降进入 Ny-Ålesund 的历史变化，结果表明人为 Pb 在 20 世纪 60 年代至 70 年代达到峰值，此后通过 (206)Pb/(207)Pb 比值的快速增加和人为 Pb 含量的显著减少，观察到了显著的恢复。与泥炭记录相反，较长的湖泊记录显示，在最上面的样品中，人为 Pb 含量相对较高，(206)Pb/(207)Pb 比值持续下降，这表明诸如流域侵蚀和融雪径流等受气候影响的过程可能影响了北极高地上湖泊沉积物中 Pb 污染记录的最近变化。
