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Selective incorporation of dissolved organic matter (DOM) during sea ice formation

机译：在海冰形成过程中选择性掺入溶解有机物（DOM）

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摘要

This study investigated the incorporation of DOM from seawater into ＜2 day-old sea ice in tanks filled with seawater alone or amended with DOM extracted from the microalga, Chlorella vulgaris. Optical properties, including chromophoric DOM (CDOM) absorption and fluorescence, as well as concentrations of dissolved organic carbon (DOC), dissolved organic nitrogen (DON), dissolved carbohydrates (dCHOs) and dissolved uronic acids (dUAs) were measured. Enrichment factors (EFs), calculated from salinity-normalized concentrations of DOM in bulk ice, brine and frost flowers relative to under-ice water, were generally ＞1. The enrichment factors varied for different DOM fractions: EFs were the lowest for humic-like DOM (1.0-1.39) and highest for amino acid-like DOM (1.10-3.94). Enrichment was generally highest in frost flowers with there being less enrichment in bulk ice and brine. Size exclusion chromatography indicated that there was a shift towards smaller molecules in the molecular size distribution of DOM in the samples collected from newly formed ice compared to seawater. Spectral slope coefficients did not reveal any consistent differences between seawater and ice samples. We conclude that DOM is incorporated to sea ice relatively more than inorganic solutes during initial formation of sea ice and the degree of the enrichment depends on the chemical composition of DOM.
机译：本研究调查了将海水中的DOM掺入单独装满海水或用微藻小球藻提取的DOM修正的小于2天的海冰中的方法。测量了光学性质，包括发色DOM（CDOM）的吸收和荧光以及溶解的有机碳（DOC），溶解的有机氮（DON），溶解的碳水化合物（dCHOs）和溶解的糖醛酸（dUAs）的浓度。由相对于冰下水的大块冰，盐水和霜花中的盐度归一化DOM浓度计算得出的富集因子（EFs）通常＞ 1。富集因子随不同DOM分数的变化而变化：EF对于腐殖质类DOM最低（1.0-1.39），而氨基酸类DOM最高（1.10-3.94）。霜花的富集通常最高，散装冰和盐水中的富集较少。尺寸排阻色谱法表明，与海水相比，从新形成的冰中收集的样品中DOM的分子大小分布向较小的分子转移。光谱斜率系数没有揭示出海水和冰样之间的任何一致差异。我们得出结论，在海冰的初始形成过程中，DOM相对于无机溶质的掺入相对要多于无机溶质，并且富集程度取决于DOM的化学成分。

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  • 来源
    《Marine Chemistry》 |2013年第20期|148-157|共10页
  • 作者

    Susann Mueller; Anssi V. Vaehaetalo; Colin A. Stedmon; Mats A. Granskog; Louiza Norman; Shazia N. Aslam; Graham J.C. Underwood; Gerhard S. Dieckmann; David N. Thomas;

  • 作者单位

    University of Helsinki, P.O. Box 65, Viikinkaari 1, FI-00014 Helsinki, Finland;

    University of Jyvaeskylae, Department of Biological and Environmental Science, 40500 Jyvaeskylae, Finland;

    Technical University of Denmark, National Institute of Aquatic Resources, Kavalergarden 6,2920 Charlottenlund, Denmark;

    Norwegian Polar Institute, Fram Centre, NO-9296 Tromse, Norway;

    University of Technology Sydney, Broadway, Sydney, New South Wales 2001, Australia,School of Ocean Sciences, Bangor University, Menai Bridge, Anglesey 1159 5AB, UK;

    School of Biological Sciences, University of Essex, CO4 3SQ Colchester, UK;

    School of Biological Sciences, University of Essex, CO4 3SQ Colchester, UK;

    Alfred Wegener Institute for Polar and Marine Research, Am Handelshafen 12, D-27570 Bremerhaven, Germany;

    School of Ocean Sciences, Bangor University, Menai Bridge, Anglesey 1159 5AB, UK,Finnish Environment Institute (SYKE), Marine Research Centre, P.O. Box 140, 00251 Helsinki, Finland,Arctic Centre, Aarhus University, DK-8000 Aarhus C, Denmark;

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  • 正文语种 eng
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  • 关键词

    Sea ice; Selective rejection; Chromophoric dissolved organic matter; (CDOM); Excitation emission fluorescence; spectroscopy; Frost flowers;

    机译：海冰;选择性排斥发色溶解的有机物;（CDOM）;激发发射荧光;光谱学霜花;

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