Coastal ocean and shelf-sea biogeochemical cycling of trace elements and isotopes: lessons learned from GEOTRACES.
Coastal ocean and shelf-sea biogeochemical cycling of trace elements and isotopes: lessons learned from GEOTRACES.
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DOI：
10.1098/rsta.2016.0076
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发表时间：
2016-11-28
期刊：
影响因子：
--
通讯作者：
Garcia-Orellana J
中科院分区：
文献类型：
--
作者：
Charette MA;Lam PJ;Lohan MC;Kwon EY;Hatje V;Jeandel C;Shiller AM;Cutter GA;Thomas A;Boyd PW;Homoky WB;Milne A;Thomas H;Andersson PS;Porcelli D;Tanaka T;Geibert W;Dehairs F;Garcia-Orellana J
大陆架和大陆架海在全球碳循环中发挥着核心作用。然而，它们在海洋盆地的痕量元素和同位素(TEI)输入方面的重要性不太为人所知。在这里，我们介绍了来自GEOTRACES计划的关于大陆架TEI生物地球化学的主要发现，以及一种估计大陆架TEI通量的新方法的概念证明。案例研究的重点是我们对北极TEI循环、一个主要河流河口(亚马逊)内的转化、陆架沉积物微量营养素通量和海底地下水排放的盆地尺度估计的理解方面的进展。建议的陆架通量示踪剂为228Re(T1/2 = 5.75 Yr)，从沿海含水层、沉积物孔隙水交换和河流持续供应到陆架。模型推导的大陆架228Ra通量与TEI/228Ra比值相结合，量化了来自北大西洋西部边缘的海洋TEI通量。这一新方法的结果与以前对陆架钴、铁、锰和锌输入的估计很好地吻合，并超过了已公布的大气沉积估计的大约3-23倍。最后，建议进行更多的GEOTRACES过程研究和以沿海边缘为重点的区段巡航，这将有助于完善模型，并更好地了解驱动陆架来源的TEI通量到海洋的机制。这篇文章是“海洋微量元素化学的生物和气候影响”专题的一部分。
Continental shelves and shelf seas play a central role in the global carbon cycle. However, their importance with respect to trace element and isotope (TEI) inputs to ocean basins is less well understood. Here, we present major findings on shelf TEI biogeochemistry from the GEOTRACES programme as well as a proof of concept for a new method to estimate shelf TEI fluxes. The case studies focus on advances in our understanding of TEI cycling in the Arctic, transformations within a major river estuary (Amazon), shelf sediment micronutrient fluxes and basin-scale estimates of submarine groundwater discharge. The proposed shelf flux tracer is 228-radium (T1/2 = 5.75 yr), which is continuously supplied to the shelf from coastal aquifers, sediment porewater exchange and rivers. Model-derived shelf 228Ra fluxes are combined with TEI/ 228Ra ratios to quantify ocean TEI fluxes from the western North Atlantic margin. The results from this new approach agree well with previous estimates for shelf Co, Fe, Mn and Zn inputs and exceed published estimates of atmospheric deposition by factors of approximately 3–23. Lastly, recommendations are made for additional GEOTRACES process studies and coastal margin-focused section cruises that will help refine the model and provide better insight on the mechanisms driving shelf-derived TEI fluxes to the ocean. This article is part of the themed issue ‘Biological and climatic impacts of ocean trace element chemistry’.
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