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Trace metal biogeochemistry in the western North Pacific.

机译：北太平洋西部的痕量金属生物地球化学。

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摘要

Dissolved and suspended particulate samples collected during the Intergovernmental Oceanographic Commission 2002 Contaminant Baseline Survey were analyzed to determine the surface and vertical distributions of Cd, Co, Cu, Mn, Ni Zn and Pb across the western and central North Pacific.;Dissolved trace metal concentrations were measured using a novel isotope dilution-ICP-MS method after extraction over an 8-hydroxyquinoline resin column and validated through the use of the SAFe consensus reference materials. Filtered suspended particulate matter was digested using an HCl/HNO3/HF mixture and analyzed by HR-ICP-MS to obtain total particulate concentrations for the trace metals and other tracer elements such as Al, Ti and P.;Particulate Mn, Fe and Al distributions reveal the importance of margin-derived material to the North Pacific. Redox-mobilization and resuspension processes were identified through particulate distributions and elemental ratios (i.e., Mn/Fe and Mn/Al). Further comparison with the hydrography of the western North Pacific revealed an extensive intermediate water mass transport system capable of advecting material beyond the immediate continental shelf. Elevated particulate Mn and Fe concentrations originating from the Kuril-Kamchatka margin are found in the central North Pacific as well as across the Kuroshio-Oyashio front.;Dissolved trace metal concentrations in the surface waters of the Western Subarctic Gyre (WSAG) are as much as 100 times higher than in typical open-ocean surface waters. Upwelling of trace-metal enriched deep waters is a significant source for some metals (Ni, Cu, Cd and Zn) while inputs from the nearby shelf sediments supply additional Mn and Co to the WSAG. Comparisons of particulate trace metal distributions with lithogenic (Al, Ti) and biogenic (P) tracers reveal the close association of Cd and P, while particulate Co is associated with both biogenic and authigenic (Mn-oxide) particles.;Dissolved and particulate Pb distributions are distinct from the other trace metals. Higher dissolved concentrations in surface and mode waters are well-correlated with the Kuroshio Current/Extension. Furthermore, vertical profiles of particulate Pb near Japan suggest subsurface inputs in addition to atmospheric inputs. A possible source for this Pb is the East China Sea, a marginal sea heavily influenced by anthropogenic inputs.
机译：分析了政府间海洋学委员会2002年污染物基准调查期间收集的溶解和悬浮颗粒物样品，以确定了北太平洋西部和中部Cd，Co，Cu，Mn，Ni，Zn和Pb的表面和垂直分布;溶解的痕量金属浓度在8-羟基喹啉树脂柱上萃取后，使用新型同位素稀释-ICP-MS方法测定了这些化合物的含量，并通过使用SAFe共有参考物质进行了验证。过滤后的悬浮颗粒物使用HCl / HNO3 / HF混合物进行消解，并通过HR-ICP-MS分析，以获得痕量金属和其他示踪元素（如Al，Ti和P）的总颗粒浓度;颗粒Mn，Fe和Al分布揭示了源自边缘的物质对北太平洋的重要性。通过颗粒分布和元素比（即Mn / Fe和Mn / Al）确定了氧化还原的迁移和重悬浮过程。与北太平洋西部的水文学的进一步比较揭示了一个广泛的中间水质输送系统，能够对邻近大陆架以外的物质进行平流。在北太平洋中部以及黑潮-大矢潮前缘发现了来自千岛-堪察加半岛边缘的较高的颗粒状Mn和Fe浓度;西部亚极回旋带（WSAG）地表水中溶解的痕量金属浓度与之相当是典型的海洋开放水域的100倍富含痕量金属的深水上升流是某些金属（Ni，Cu，Cd和Zn）的重要来源，而附近架子沉积物的输入又为WSAG提供了额外的Mn和Co。用成岩（Al，Ti）和生物成因（P）示踪剂比较微粒痕量金属分布，发现Cd和P密切相关，而微粒Co与生物成因和自生（Mn-氧化物）微粒都有关系。分布不同于其他痕量金属。地表水和模式水中的较高溶解浓度与黑潮水流/扩展区密切相关。此外，日本附近的铅颗粒垂直剖面表明，除了大气输入外，还有地下输入。铅的可能来源是东中国海，这是受人为因素严重影响的边缘海。

著录项

  • 作者

    Morton, Peter Lynn.;

  • 作者单位

    Old Dominion University.;

  • 授予单位 Old Dominion University.;
  • 学科 Chemical Oceanography.;Biogeochemistry.;Geochemistry.
  • 学位 Ph.D.
  • 年度 2010
  • 页码 181 p.
  • 总页数 181
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 古生物学;
  • 关键词

  • 入库时间 2022-08-17 11:37:01

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