Cadmium in corals as a tracer of historical upwelling and industrial fallout
Cadmium in corals as a tracer of historical upwelling and industrial fallout
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DOI：
10.1038/328794a0
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发表时间：
1987-08
期刊：
影响因子：
64.8
通讯作者：
G. T. Shen;E. Boyle;D. Lea
中科院分区：
文献类型：
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作者：
G. T. Shen;E. Boyle;D. Lea
石珊瑚中的晶格结合镉是海洋表层历史上自然和人为扰动的敏感化学示踪剂。镉是海水中一种生物介导的微量成分，其分布与营养盐磷酸盐和硝酸盐相似。在正常情况下，生物活动会消耗海洋表层的营养物质和镉浓度。然而，我们分析了来自加拉帕戈斯群岛和百慕大北岩的两种珊瑚，在过去的世纪中，骨骼镉表现出惊人的波动。这些变化似乎是对两种不同现象的反应：（1）加拉帕戈斯的可变上升流（厄尔尼诺-南方涛动事件）和（2）20世纪世纪的风成通量，北美工业镉到北大西洋西部。
Lattice-bound cadmium in scleractinian corals is a sensitive chemical tracer of historical natural and anthropogenic perturbations to the surface ocean. Cadmium, a biologically-mediated trace constituent of sea water, is distributed analogously to the nutrients, phosphate and nitrate. Under normal circumstances, biological activity depletes surface ocean nutrient and cadmium concentrations. Two corals we have analysed from the Galapagos Islands and North Rock, Bermuda, however, exhibit striking fluctuations in skeletal cadmium within the past century. These variations appear to have occurred in response to two separate phenomena: (1) variable upwelling at Galapagos (El Niño – Southern Oscillation events) and (2) aeolian fluxes of twentieth century, North American industrial cadmium to the western North Atlantic.