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首页> 外文期刊>Marine Chemistry >Accumulation processes of trace metals into Arctic sea ice: distribution of Fe, Mn and Cd associated with ice structure
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Accumulation processes of trace metals into Arctic sea ice: distribution of Fe, Mn and Cd associated with ice structure

机译：北极海冰中痕量金属的积累过程：与冰结构相关的铁，锰和镉的分布

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摘要

Biogeochemical cycling of trace metals in sea ice is important to the productivity of the Arctic Ocean. Unfortunately, the processes by which trace metals accumulate into sea ice are poorly understood. To gain a clearer understanding of the mechanisms behind trace metal accumulation, dissolved (D, 0.2 mu m), and labile particulate (LP = Total Dissolvable Dissolved) iron (Fe), manganese (Mn), and cadmium (Cd) concentrations were compared to the structure observed in sea ice. Samples were pre-concentrated via solid-phase extraction on NOBIAS Chelate PA-1 resin and analyzed on a Graphite Furnace Atomic Absorption Spectrometer. Using photographic analysis for the percentage of pore microstructure and delta O-18 analysis, sea ice structure was determined to be snow ice, granular ice (frazil ice), mixed ice (granular and columnar ice) and columnar ice. Salinity and nutrients were low, indicating brine drainage and multi-year ice. High trace metal concentrations in snow ice indicated meteoric snow was a source of trace metals to sea ice. High concentrations of LPFe in granular ice indicated entrainment of suspended particulate trace metals by frazil ice during the formation of the granular ice structure. Whereas the high concentrations of DFe and DMn in granular ice may have been due to reduction from LPFe and LPMn after particle entrainment, indicating chemical transformation processes. Low dissolved and labile particulate trace metal concentrations in mixed and columnar ice indicated a release due to brine drainage. Our study clearly indicates that the differences observed in trace metals among sea ice structures, showed that sea ice formation, chemical reduction and brine release were the processes driving trace metal accumulation and release in the Arctic sea ice.
机译：海冰中痕量金属的生物地球化学循环对于北冰洋的生产力至关重要。不幸的是，人们对痕量金属积累到海冰中的过程了解甚少。为了更清楚地了解痕量金属积累，溶解（D，<0.2微米）和不稳定颗粒（LP =总可溶解溶解）的机理，铁，铁，锰和镉的浓度分别为与海冰中观察到的结构相比。样品通过固相萃取在NOBIAS Chelate PA-1树脂上进行预浓缩，并在石墨炉原子吸收光谱仪上进行分析。使用照相分析法进行孔隙微结构的百分比分析和δO-18分析，确定海冰结构为雪冰，粒状冰（巴西冰），混合冰（粒状和柱状冰）和柱状冰。盐度和养分含量低，表明盐水排干和多年结冰。雪冰中痕量金属的浓度很高，表明流冰是海冰中痕量金属的来源。颗粒冰中的高浓度LPFe表示在颗粒冰结构形成过程中，巴西冰夹带了悬浮的颗粒微量金属。而颗粒状冰中高浓度的DFe和DMn可能是由于颗粒夹带后LPFe和LPMn的还原，表明了化学转化过程。混合和柱状冰中溶解的和不稳定的微粒痕量金属浓度低，表明由于盐水排泄而释放。我们的研究清楚地表明，在海冰结构之间观察到的痕量金属之间的差异表明，海冰的形成，化学还原和盐水释放是促使微量金属在北极海冰中积累和释放的过程。

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  • 来源
    《Marine Chemistry》 |2019年第20期|36-47|共12页
  • 作者

    Evans La Kenya; Nishioka Jun;

  • 作者单位

    Hokkaido Univ, Grad Sch Environm Earth Sci, Kita Ku, Kita 10,Nishi 5, Sapporo, Hokkaido 0600810, Japan|Hokkaido Univ, Inst Low Temp Sci, Kita Ku, Kita 19,Nishi 8, Sapporo, Hokkaido 0600819, Japan;

    Hokkaido Univ, Inst Low Temp Sci, Kita Ku, Kita 19,Nishi 8, Sapporo, Hokkaido 0600819, Japan;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Sea ice structure; Trace metals; Dissolved; Labile particulate;

    机译：海冰结构;痕量金属;溶解;不稳定颗粒;

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