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首页> 外文期刊>Marine Chemistry >Iron in land-fast sea ice of McMurdo Sound derived from sediment resuspension and wind-blown dust attributes to primary productivity in the Ross Sea, Antarctica
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Iron in land-fast sea ice of McMurdo Sound derived from sediment resuspension and wind-blown dust attributes to primary productivity in the Ross Sea, Antarctica

机译：沉积物的悬浮和风吹尘埃产生的麦克默多峡湾海陆冰中的铁归因于南极罗斯海的初级生产力

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摘要

We present high-accuracy isotope dilution mass spectrometry data on dissolved Fe (DFe), total dissolvable Fe (TD-Fe) and refractory paniculate Fe (REF-Fe) concentrations in snow, land-fast ice and under-ice seawater, sampled at six sites from 14 to 22 January 2003 in Erebus Bay, McMurdo Sound. We also report refractory paniculate Fe/Al ratios to help identify Fe sources. Iron concentrations in land-fast ice and snow were two to three orders of magnitude higher than the underlying seawater. Seawater Fe increased in all fractions over the sampling period (8 days), likely caused by sediment resuspension induced by spring tides, which occur twice a month. We propose that entrainment of wind-blown material and sediment-derived Fe is the most important pathway for high Fe concentrations in land-fast ice in McMurdo Sound. Iron fluxes from the sediment were estimated and could fully account for the Fe inventory of the land-fast ice. Wind-blown lithogenic material in the snow on the land-fast ice makes up for 14-68% of the total Fe inventory of the sea ice. It does not appear to penetrate into the sea ice proper as snow-ice forming conditions were not present. The sources of these wind-blown particles are, in decreasing order of strength, the McMurdo Ice Shelf, the Dry Valleys, Ross Island and Erebus volcanic emissions. The data suggest that the usual spring breakup of sediment-laden land-fast ice to the Ross Sea may have a significant potential fertilizing effect on the waters of the Ross Sea Polynya.This is illustrated by the strong diminution of primary production in the Ross Sea Polynya due to the blockade of the annual sea ice breakout by the giant icebergs B-15 and C-19 during the austral summer of 2003.
机译：我们提供了关于雪，陆地速冻冰和冰底海水中溶解的Fe（DFe），总可溶性Fe（TD-Fe）和难熔颗粒Fe（REF-Fe）浓度的高精度同位素稀释质谱数据， 2003年1月14日至22日在麦克默多湾Erebus湾的六个地点。我们还报告了难熔的颗粒状铁/铝比，以帮助识别铁源。陆地抗冰和降雪中的铁含量比底层海水高出两到三个数量级。在采样期间（8天），所有部分的海水铁含量均增加，这可能是由于春季潮汐引起的沉积物再悬浮所致，每月两次。我们认为夹带风吹物质和沉积物衍生的铁是麦克默多海峡中陆固冰中高铁含量的最重要途径。估算了来自沉积物的铁通量，这些铁通量可充分说明陆冰中铁的存量。陆冰上雪中的风吹成岩物质占海冰总铁储量的14-68％。由于没有形成冰雪的条件，因此它似乎没有适当地渗透到海冰中。这些风吹颗粒的来源按强度从高到低的顺序依次是麦克默多冰架，干旱谷，罗斯岛和埃里布斯火山排放物。数据表明，通常情况下春季充满泥沙的陆地固结冰向罗斯海的分解可能对罗斯海波利尼亚的水域具有显着的潜在施肥作用，这可以通过罗斯海一次生产的强烈减少来说明。波利尼亚（Polynya）是由于2003年南方夏季，巨大的冰山B-15和C-19阻止了每年的海冰爆发。

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  • 来源
    《Marine Chemistry》 |2013年第20期|24-40|共17页
  • 作者

    Jeroen de Jong; Veronique Schoemann; Nathalie Maricq; Nadine Mattielli; Patricia Langhorne; Timothy Haskell; Jean-Louis Tison;

  • 作者单位

    Laboratoire G-TIME, Ceochimie-Tracage Isotopique, Mineral et Elementaire CP 160/02, Departement des Sciences de la Terre et de I'Environnement, Universite Libre de Bruxelles, Avenue F.D. Roosevelt 50, B-1050 Brussels, Belgium;

    Laboratoire de Glaciologie CP 160/03, Departement des Sciences de la Terre et de I'Environnement, Universite Libre de Bruxelles. Avenue FD. Roosevelt 50, B-1050 Brussels, Belgium;

    Laboratoire G-TIME, Ceochimie-Tracage Isotopique, Mineral et Elementaire CP 160/02, Departement des Sciences de la Terre et de I'Environnement, Universite Libre de Bruxelles, Avenue F.D. Roosevelt 50, B-1050 Brussels, Belgium;

    Laboratoire G-TIME, Ceochimie-Tracage Isotopique, Mineral et Elementaire CP 160/02, Departement des Sciences de la Terre et de I'Environnement, Universite Libre de Bruxelles, Avenue F.D. Roosevelt 50, B-1050 Brussels, Belgium;

    Sea Ice Croup, Department of Physics, University of Otago, P.O. Box 56, Dunedin 9054, New Zealand;

    Industrial Research Ltd, 69 Cracefield Road, P.O. Box 31310, Lower Hutt 5040, New Zealand;

    Laboratoire de Glaciologie CP 160/03, Departement des Sciences de la Terre et de I'Environnement, Universite Libre de Bruxelles. Avenue FD. Roosevelt 50, B-1050 Brussels, Belgium;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Iron; Sea ice; Sediments; Resuspension; Suspended paniculate matter; Atmospheric particulates; Primary production;

    机译：铁;海冰;沉积物;重悬;悬浮颗粒物;大气颗粒物;初级生产;

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