Effect of recent climate change on Arctic Pb pollution: a comparative study of historical records in lake and peat sediments.
Effect of recent climate change on Arctic Pb pollution: a comparative study of historical records in lake and peat sediments.
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DOI：
10.1016/j.envpol.2011.09.019
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发表时间：
2012
影响因子：
8.9
通讯作者：
Xiao-dong Liu;Shan Jiang;Pengfei Zhang;Liqiang Xu
中科院分区：
文献类型：
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作者：
Xiao-dong Liu;Shan Jiang;Pengfei Zhang;Liqiang Xu
根据北极新奥尔松湖泊和泥炭沉积剖面中的铅浓度和同位素比值，重建了人为铅污染的历史变化。计算的过量铅同位素比值表明，铅污染主要来自西欧和俄罗斯。泥炭剖面清楚地反映了大气中人为铅沉积的历史变化，结果表明，人为铅在20世纪60-70年代达到峰值，此后显著恢复，206Pb/207Pb比值迅速增加，人为铅含量显著下降。与泥炭记录相比，较长的湖泊记录显示出相对较高的人为铅含量和最上层样品中206Pb/207Pb比值的持续下降，这表明气候敏感过程，如集水区侵蚀和融水径流，可能影响了高北极湖泊沉积物中铅污染记录的近期变化。
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 of206Pb/207Pb 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 of206Pb/207Pb 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.