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Fractional iron solubility of atmospheric iron inputs to the Southern Ocean

机译：进入南部海洋的大气铁的分数铁溶解度

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摘要

Deposition of iron (Fe) bearing aerosols to Fe deficient waters of the Southern Ocean may drive rapid changes in primary productivity, trophic structure and the biological uptake of carbon dioxide. The fractional solubility (i.e., the ratio of water leachable Fe to total Fe) of aerosol Fe is an important variable determining its availability for biological uptake, and is a function of both particle type and the experimental conditions used to leach the particles. There have been few studies of fractional Fe solubility over the Southern Ocean where the aerosol loading is the lowest in the world. To investigate Southern Ocean aerosol Fe solubility, the fractional solubility of Fe was determined in cryogenically archived Southern Ocean aerosols. Samples were collected at the Cape Grim Baseline Air Pollution Station (CGBAPS), Tasmania, Australia from February 1999 to April 2000. Fractions determined included water soluble Fe (<0.45 mu m), labile Fe (>0.45 mu m; acetic acid and hydroxylamine hydrochloride leachable Fe) and refractory Fe (>0.45 mu m; total digestion using nitric and hydrofluoric adds). Extremely low Fe mass concentrations were observed for baseline Southern Ocean air during the study period. An inverse hyperbolic relationship was observed between fractional Fe solubility (0.5 to 56%) and total Fe mass concentration (0.04 to 5.8 ng m(3); excluding an anomalously high sample). A peak of 4.6 ng m(3) of labile Fe occurred during May/June 1999 and was linked to atmospheric transport from South Western Australia over the Southern Ocean. Bioavailable Fe was estimated by summing the water soluble and labile Fe fractions, and this likely represents the upper bound of long range transport aerosol over the Southern Ocean. The results confirm previous reports of a range of fractional Fe solubility within all atmospheric particles measured and also suggest that a large fraction of the Fe from Australian mineral aerosols is labile and potentially bioavailable. (C) 2015 Elsevier B.V. All rights reserved,
机译：在南大洋缺铁的水域沉积含铁（Fe）的气溶胶可能会导致初级生产力，营养结构和二氧化碳的生物吸收迅速变化。气溶胶Fe的分数溶解度（即水可溶Fe与总Fe的比例）是决定其可被生物吸收的重要变量，并且是颗粒类型和用于浸出颗粒的实验条件的函数。很少有关于南极洲的铁溶解度的研究，那里的气溶胶负载量是世界上最低的。为了研究南大洋气溶胶中铁的溶解度，确定了在低温归档的南大洋气溶胶中Fe的分数溶解度。从1999年2月至2000年4月在澳大利亚塔斯马尼亚州的Cape Grim基线空气污染站（CGBAPS）收集了样品。确定的馏分包括水溶性Fe（<0.45μm），不稳定的Fe（> 0.45μm；乙酸和羟胺）盐酸可浸出的铁）和难熔的铁（> 0.45微米；使用硝酸和氢氟酸完全消化）。在研究期间，基线南洋空气中的铁质量浓度极低。在部分Fe溶解度（0.5至56％）与总Fe质量浓度（0.04至5.8 ng m（3）；不包括异常高的样品）之间观察到反双曲线关系。 1999年5月/ 6月出现了4.6 ng m（3）的不稳定铁峰，该峰与澳大利亚西南部通过南大洋的大气传输有关。可生物利用的铁是通过将水溶性和不稳定的铁部分相加而得出的，这很可能代表了南大洋上远程运输气溶胶的上限。该结果证实了先前关于所有测得的大气颗粒中部分Fe溶解度范围的报道，也表明来自澳大利亚矿物气溶胶的大部分Fe不稳定且具有生物利用潜力。 （C）2015 Elsevier B.V.保留所有权利，

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  • 来源
    《Marine Chemistry》 |2015年第1期|20-32|共13页
  • 作者

    Winton V. H. L.; Bowie A. R.; Edwards R.; Keywood M.; Townsend A. T.; van der Merwe P.; Bollhoefer A.;

  • 作者单位

    Curtin Univ, Phys & Astron, Perth, WA 6845, Australia;

    Univ Tasmania, Antarctic Climate & Ecosyst CRC, Hobart, Tas, Australia|Univ Tasmania, Inst Marine & Antarctic Studies, Hobart, Tas, Australia;

    Curtin Univ, Phys & Astron, Perth, WA 6845, Australia;

    CSIRO Oceans & Atmosphere Flagship, Aspendale, Vic, Australia;

    Univ Tasmania, Cent Sci Lab, Hobart, Tas, Australia;

    Univ Tasmania, Antarctic Climate & Ecosyst CRC, Hobart, Tas, Australia;

    Environm Res Inst Supervising Scientist, Dept Environm, Darwin, NT, Australia;

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  • 正文语种 eng
  • 中图分类
  • 关键词

    Aerosol; Iron; Trace metals; Labile; Bioavailable iron; Cape Grim; Southern Ocean;

    机译：气雾剂;铁;微量金属;不稳定;可生物利用的铁;格里姆角;南大洋;

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