The Cd isotope composition of atmospheric aerosols from the Tropical Atlantic Ocean
The Cd isotope composition of atmospheric aerosols from the Tropical Atlantic Ocean
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DOI：
10.1002/2017gl072748
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发表时间：
2017-03-28
影响因子：
5.2
通讯作者：
Achterberg, Eric P.
中科院分区：
文献类型：
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作者：
Bridgestock, Luke;Rehkamper, Mark;Achterberg, Eric P.
稳定同位素组合物可以潜在地用于跟踪大气镉输入到海洋表面和人为镉排放到大气中。这两个应用程序可以提供有价值的见解的影响，人类活动对镉在环境中的循环。然而，缺乏大气气溶胶的镉同位素组成的限制，目前阻碍了这样的研究。在这里，我们提出了稳定的镉同位素数据收集在热带大西洋的气溶胶。这些样品具有不同比例的矿物粉尘衍生和人为镉，但表现出相似的同位素组成，从而否定了这些镉源的区别，在这个地区使用同位素签名。这两个大气镉源之间的同位素变异可能会在其他地区，因此值得进一步调查。无论如何，这些数据提供了重要的初始限制大气镉输入到海洋的同位素组成。
Stable isotope compositions can potentially be used to trace atmospheric Cd inputs to the surface ocean and anthropogenic Cd emissions to the atmosphere. Both of these applications may provide valuable insights into the effects of anthropogenic activities on the cycling of Cd in the environment. However, a lack of constraints for the Cd isotope compositions of atmospheric aerosols is currently hindering such studies. Here we present stable Cd isotope data for aerosols collected over the Tropical Atlantic Ocean. The samples feature variable proportions of mineral dust-derived and anthropogenic Cd, yet exhibit similar isotope compositions, thus negating the distinction of these Cd sources by using isotopic signatures in this region. Isotopic variability between these two atmospheric Cd sources may be identified in other areas, and thus warrants further investigation. Regardless, these data provide important initial constraints on the isotope composition of atmospheric Cd inputs to the ocean.