Interrogating trees for isotopic archives of atmospheric sulphur deposition and comparison to speleothem records.
Interrogating trees for isotopic archives of atmospheric sulphur deposition and comparison to speleothem records.
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DOI：
10.1016/j.envpol.2013.12.017
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发表时间：
2014-04
影响因子：
8.9
通讯作者：
P. M. Wynn;N. Loader;I. J. Fairchild
中科院分区：
文献类型：
--
作者：
P. M. Wynn;N. Loader;I. J. Fairchild
描述硫动态变化的古记录是记录大气污染的宝贵资源。树木年轮构成了一个随处可见且绝对可以确定日期的档案，为探索局部到区域范围内硫的可用性趋势提供了潜力。开发了一种使用元素分析仪同位素比质谱 (EA-IRMS) 的新型“在线”方法进行快速同位素分析，使用 40 毫克木粉的样品量可实现 <0.4‰ 的样品精度。意大利东北部的树芯显示出污染趋势，这一点可以通过硫浓度向最年轻的生长方向增加来证明，以及硫同位素的反向趋势，将轻硫同位素的现代生长（+0.7‰）与受基岩成分影响的工业化前生长（+7.5‰）区分开来。与同一地点的洞穴记录进行比较表明了重复性，尽管同位素值因地下水储存而有所抵消。使用 EA-IRMS，树木年轮档案成为了解当地到区域范围硫污染动态的宝贵资源。
Palaeorecords which depict changes in sulphur dynamics form an invaluable resource for recording atmospheric pollution. Tree rings constitute an archive that are ubiquitously available and can be absolutely dated, providing the potential to explore local- to regional-scale trends in sulphur availability. Rapid isotopic analysis by a novel “on-line” method using elemental analyser isotope ratio mass spectrometry (EA-IRMS) is developed, achieving sample precision of <0.4‰ using sample sizes of 40 mg wood powder. Tree cores from NE Italy show trends in pollution, evidenced through increasing concentrations of sulphur towards the youngest growth, and inverse trends in sulphur isotopes differentiating modern growth with light sulphur isotopes (+0.7‰) from pre-industrial growth (+7.5‰) influenced by bedrock composition. Comparison with speleothem records from the same location demonstrate replication, albeit offset in isotopic value due to groundwater storage. Using EA-IRMS, tree ring archives form a valuable resource for understanding local- to regional-scale sulphur pollution dynamics.