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首页> 外文期刊>Environmental Science & Technology >CDOM Sources and Photobleaching Control Quantum Yields for Oceanic DMS Photolysis
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CDOM Sources and Photobleaching Control Quantum Yields for Oceanic DMS Photolysis

机译：海洋DMS光解的CDOM来源和光漂白控制量子产率

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摘要

Photolysis is a major removal pathway for the biogenic gas dimethylsulfide (DMS) in the surface ocean. Here we tested the hypothesis that apparent quantum yields (AQY) for DMS photolysis varied according to the quantity and quality of its photosensitizers, chiefly chromophoric dissolved organic matter (CDOM) and nitrate. AQY compiled from the literature and unpublished studies ranged across 3 orders of magnitude at the 330 nm reference wavelength. The smallest AQY(330) were observed in coastal waters receiving major riverine inputs of terrestrial CDOM (0.06—0.5 m~3 (mol quanta)~(-1)). In open-ocean waters, AQY(330) generally ranged between 1 and 10 m~3 (mol quanta)~(-1). The largest AQY(330), up to 34 m~3 (mol quanta)~(-1)), were seen in the Southern Ocean potentially associated with upwelling. Despite the large AQY variability, daily photolysis rate constants at the sea surface spanned a smaller range (0.04—3.7 d~(-1)), mainly because of the inverse relationship between CDOM absorption and AQY. Comparison of AQY(330) with CDOM spectral signatures suggests there is an interplay between CDOM origin (terrestrial versus marine) and photobleaching that controls variations in AQYs, with a secondary role for nitrate. Our results can be used for regional or large-scale assessment of DMS photolysis rates in future studies.
机译：光解是表层海洋中生物气二甲基硫（DMS）的主要去除途径。在这里，我们测试了以下假设：DMS光解的表观量子产率（AQY）取决于其光敏剂（主要是发色溶解有机物（CDOM）和硝酸盐）的数量和质量。根据文献和未发表的研究汇编的AQY在330 nm参考波长处跨越3个数量级。在接受陆地CDOM主要河流输入的沿海水域，观测到最小的AQY（330）（0.06-0.5 m〜3（mol定量）〜（-1））。在开阔海洋水域中，AQY（330）的范围通常在1至10 m〜3（mol定量）〜（-1）之间。在南大洋发现最大的AQY（330），高达34 m〜3（mol Quanta）〜（-1））。尽管AQY的变化很大，但海面的每日光解速率常数却在较小的范围内（0.04-3.7 d〜（-1）），这主要是由于CDOM吸收与AQY之间存在反比关系。将AQY（330）与CDOM光谱特征进行比较表明，CDOM起源（陆地与海洋）与控制AQYs变化的光致漂白之间存在相互作用，而硝酸盐则具有辅助作用。我们的结果可用于未来研究中的DMS光解速率的区域或大规模评估。

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  • 来源
    《Environmental Science & Technology》 |2016年第24期|13361-13370|共10页
  • 作者

    Martí Galí; David J. Kieber; Cristina Romera-Castillo; Joanna D. Kinsey; Emmanuel Devred; Gonzalo L. Pérez; George R. Westby; Cèlia Marrasé; Marcel Babin; Maurice Levasseur; Carlos M. Duarte; Susana Agusti; Rafel Simó;

  • 作者单位

    Takuvik Joint International Laboratory (Université Laval — CNRS), Biology Department, Université Laval, 1045 Avenue de la Médecine, G1 V 0A6 Quebec, Quebec, Canada;

    Department of Chemistry, College of Environmental Science and Forestry, State University of New York, 1 Forestry Drive, Syracuse, New York 13210, United States;

    Rosenstiel School of Marine and Atmospheric Science, RSMAS/OCE, University of Miami, Miami, Florida 33149, United States,Department of Limnology and Bio-Oceanography, Center of Ecology, University of Vienna, 1090 Vienna, Austria;

    Department of Chemistry, College of Environmental Science and Forestry, State University of New York, 1 Forestry Drive, Syracuse, New York 13210, United States,Department of Marine, Earth and Atmospheric Sciences, North Carolina State University, 2800 Faucette Drive, Raleigh, North Carolina 27695, United States;

    Takuvik Joint International Laboratory (Université Laval — CNRS), Biology Department, Université Laval, 1045 Avenue de la Médecine, G1 V 0A6 Quebec, Quebec, Canada,Fisheries and Oceans Canada, Bedford Institute of Oceanography, Dartmouth, NS B2Y 4A2, Canada;

    Instituto INIBIOMA (CRUB Comahue, CONICET), Quintral 1250, 8400 S.C. de Bariloche, Rio Negro, Argentina;

    Department of Chemistry, College of Environmental Science and Forestry, State University of New York, 1 Forestry Drive, Syracuse, New York 13210, United States;

    Department of Marine Biology and Oceanography, Institut de Ciències del Mar (CSIC), Passeig Marítim de la Barceloneta 37-49, 08003 Barcelona, Catalonia Spain;

    Takuvik Joint International Laboratory (Université Laval — CNRS), Biology Department, Université Laval, 1045 Avenue de la Médecine, G1 V 0A6 Quebec, Quebec, Canada;

    Takuvik Joint International Laboratory (Université Laval — CNRS), Biology Department, Université Laval, 1045 Avenue de la Médecine, G1 V 0A6 Quebec, Quebec, Canada;

    King Abdullah University of Science and Technology (KAUST), Red Sea Research Center (RSRC), Thuwal, 23955-6900, Saudi Arabia;

    King Abdullah University of Science and Technology (KAUST), Red Sea Research Center (RSRC), Thuwal, 23955-6900, Saudi Arabia;

    Department of Marine Biology and Oceanography, Institut de Ciències del Mar (CSIC), Passeig Marítim de la Barceloneta 37-49, 08003 Barcelona, Catalonia Spain;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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