Trace element and isotope deposition across the air-sea interface: progress and research needs.
Trace element and isotope deposition across the air-sea interface: progress and research needs.
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DOI：
10.1098/rsta.2016.0190
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发表时间：
2016-11-28
期刊：
影响因子：
--
通讯作者：
van Hulten MMP
中科院分区：
文献类型：
--
作者：
Baker AR;Landing WM;Bucciarelli E;Cheize M;Fietz S;Hayes CT;Kadko D;Morton PL;Rogan N;Sarthou G;Shelley RU;Shi Z;Shiller A;van Hulten MMP
生物必需微量元素，特别是铁的大气沉积的重要性，是广泛认识到的，因为是准确定量的微量元素的湿和干沉积率和它们的溶解度分数的困难。本文总结了这一领域的一些最新进展，特别是由GEOTRACES和其他国际研究计划推动的进展。讨论了用于估计大气沉积通量的模型的效用和局限性，例如，从海洋表面的示踪剂分布，如溶解的铝，并强调了一个相对较新的技术，用于量化使用短寿命的放射性核素铍-7大气沉积。有人建议，这一领域将更迅速地推进使用多示踪剂的方法，气溶胶沉积模型应地面实况对观测到的气溶胶浓度数据。提高我们对控制这些示踪剂溶解度的机制和速率的理解也很重要。气溶胶的来源和化学（湿度，酸度和有机配体特性）在控制示踪剂的溶解度中起着重要的作用。其中许多因素可能会受到未来大气成分变化的影响。气溶胶化学和溶解度分数的相互校准工作是GEOTRACES方案的一个重要组成部分。这篇文章是主题问题“海洋微量元素化学的生物和气候影响”的一部分。
The importance of the atmospheric deposition of biologically essential trace elements, especially iron, is widely recognized, as are the difficulties of accurately quantifying the rates of trace element wet and dry deposition and their fractional solubility. This paper summarizes some of the recent progress in this field, particularly that driven by the GEOTRACES, and other, international research programmes. The utility and limitations of models used to estimate atmospheric deposition flux, for example, from the surface ocean distribution of tracers such as dissolved aluminium, are discussed and a relatively new technique for quantifying atmospheric deposition using the short-lived radionuclide beryllium-7 is highlighted. It is proposed that this field will advance more rapidly by using a multi-tracer approach, and that aerosol deposition models should be ground-truthed against observed aerosol concentration data. It is also important to improve our understanding of the mechanisms and rates that control the fractional solubility of these tracers. Aerosol provenance and chemistry (humidity, acidity and organic ligand characteristics) play important roles in governing tracer solubility. Many of these factors are likely to be influenced by changes in atmospheric composition in the future. Intercalibration exercises for aerosol chemistry and fractional solubility are an essential component of the GEOTRACES programme. This article is part of the themed issue ‘Biological and climatic impacts of ocean trace element chemistry’.
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