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The distinct nitrogen isotopic compositions of low and high molecular weight marine DON

机译：低分子量和高分子量海洋DON的独特氮同位素组成

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摘要

To constrain the sources and cycling of bulk and size-fractionated marine dissolved organic nitrogen (DON), samples were collected for concentration and isotopic (δ~(15)N) analysis from the western tropical North Atlantic Ocean as well as over the North Australian shelf. Bulk DON concentrations are typically between 4 and 6μM, with low molecular weight (LMW, i.e., <1000Da) DON accounting for 60 to 70% of total DON. The δ~(15)N of both bulk and high molecular weight (HMW, i.e., > 1000 Da to <0.2 μm) DON from the western tropical North Atlantic is similar to previous measurements, as well as to bulk and HMW DON collected off the North Australian Shelf, ~4‰. Here we report the first measurement of marine LMW DON δ~(15)N, and a coherent pattern emerges where LMW DON δ~(15)N
机译：为了限制散装和大小分级的海洋溶解有机氮（DON）的来源和循环，从热带北大西洋西部以及北澳大利亚收集了样品进行浓度和同位素（δ〜（15）N）分析架。大量的DON浓度通常在4至6μM之间，低分子量（LMW，即<1000Da）DON占总DON的60％至70％。来自西热带北大西洋的散装和高分子量DON（HMW，> 1000 Da至<0.2μm）的δ〜（15）N与以前的测量结果相似，也与散装和HMW DON收集到的δ〜（15）N相似。北澳大利亚大陆架，〜4‰。在这里，我们报告了海洋LMW DONδ〜（15）N的首次测量，并且在LMW DONδ〜（15）N

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  • 来源
    《Marine Chemistry》 |2012年第20期|p.24-33|共10页
  • 作者

    Angela N. Knapp; Daniel M. Sigman; Adam B. Kustka; Sergio A. Sanudo-Wilhelmy; Douglas G. Capone;

  • 作者单位

    Rosenstiel School of Marine and Atmospheric Sciences, University of Miami, 4600 Rickenbacker Cswy, Miami, FL 33149, United States;

    Princeton University, Department of Ceosciences, Guyot Hall, Princeton, NJ 08544, United States;

    Earth and Environmental Sciences, Rutgers University-Newark, 101 Warren St., Smith Hall, Newark, NJ 07102, United States;

    University of Southern California, Marine and Environmental Biology Dept., 3616 Trousdale Pkwy, Los Angeles, CA 90089-0371, United States;

    University of Southern California, Marine and Environmental Biology Dept., 3616 Trousdale Pkwy, Los Angeles, CA 90089-0371, United States;

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  • 正文语种 eng
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  • 关键词

    dissolved organic nitrogen; nitrogen isotopes; size fractionated organic matter;

    机译：溶解的有机氮氮同位素粒度分级有机物;

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