Soluble trace metals in aerosols over the tropical south-east Pacific offshore of Peru
Soluble trace metals in aerosols over the tropical south-east Pacific offshore of Peru
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DOI：
10.5194/bg-13-817-2016
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发表时间：
2016-01-01
期刊：
影响因子：
4.9
通讯作者：
Plasencia Sanchez, E.
中科院分区：
文献类型：
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作者：
Baker, A. R.;Thomas, M.;Plasencia Sanchez, E.
对2012年12月FS Meteor号在秘鲁沿海M91巡航期间收集的散装气溶胶样品进行了可溶性微量金属（Fe、Al、Mn、Ti、Zn、V、Ni、Cu、Co、Cd、Pb、Th）和主要离子（包括NO3-和NH 4+）含量分析。这些数据是在全球海洋大气中这一研究相对较少的区域首次记录的痕量金属数据之一。在南纬13度以北，几种元素（Fe、Ti、Zn、V、Ni、Pb）的浓度似乎与距海岸的距离有关。在南部的样带（类似于15-16度S），Fe，Cu，Co和Ni的浓度升高，我们计算的干沉积通量的可溶性铜约一个数量级高于最近的模型为基础的估计总铜沉积到该地区。该模型没有考虑到排放量的大型冶炼设施在南部的秘鲁和北方智利，我们的研究结果可能表明，这些设施构成了一个重要的来源，该地区的微量金属。计算的干沉降通量（无机氮和可溶性铁分别为3370-17800和16-107 nmol m（-2）d（-1））表明，大气输入到秘鲁上升流系统的沃茨中，相对于浮游植物的需求，Fe超过N。这可能是重要的，因为据报道，这些沃茨的初级生产受到铁可用性的限制，但大气沉积不太可能是该系统铁的主要来源。
Bulk aerosol samples collected during cruise M91 of FS Meteor off the coast of Peru in December 2012 were analysed for their soluble trace metal (Fe, Al, Mn, Ti, Zn, V, Ni, Cu, Co, Cd, Pb, Th) and major ion (including NO3- and NH4+) content. These data are among the first recorded for trace metals in this relatively poorly studied region of the global marine atmosphere. To the north of similar to 13 degrees S, the concentrations of several elements (Fe, Ti, Zn, V, Ni, Pb) appear to be related to distance from the coast. At the south of the transect (similar to 15-16 degrees S), elevated concentrations of Fe, Cu, Co, and Ni were observed, and we calculated dry deposition fluxes of soluble Cu approximately an order of magnitude higher than a recent model-based estimate of total Cu deposition to the region. The model did not take account of emissions from the large smelting facilities in the south of Peru and northern Chile, and our results may indicate that these facilities constitute an important source of trace metals to the region. Calculated dry deposition fluxes (3370-17800 and 16-107 nmol m(-2) d(-1) for inorganic nitrogen and soluble Fe respectively) indicated that atmospheric input to the waters of the Peru upwelling system contains an excess of Fe over N, with respect to phytoplankton requirements. This may be significant as primary production in these waters has been reported to be limited by Fe availability, but atmospheric deposition is unlikely to be the dominant source of Fe to the system.