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Multiproxy probing of rainwater dissolved organic matter (DOM) composition in coastal storms as a function of trajectory

机译：多轨迹探测沿海风暴中雨水溶解有机物（DOM）的组成与轨迹的关系

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摘要

Rainwater dissolved organic matter (DOM) was characterized in two sequential coastal rainstorms of different geographic origins: an Atlantic hurricane (Hurricane Irene 12011]) and a terrestrial squall. Using a multiproxy approach incorporating electrospray ionization Fourier transform ion cyclotron resonance mass spectrometry (FT1CR), stable carbon isotope analysis, and excitation-emission fluorescence spectroscopy, we demonstrate the unique composition of marine-derived organic matter in Atlantic hurricane rainwater. Hurricane Irene rainwater DOM (DOM_(lrene)) was molecularly distinct from that of the terrestrial squall (DOM_(squall)). For example, δ~(13)C_(doc) of Irene rainwater was -19.2 ± 0.13‰ while that of the squall was - 26.3 ± 0.01‰. Peaks assigned using FTICR which were unique to DOM_(lrene) contained a greater relative number of molecular formulas containing nitrogen (representing any of several isomeric CHON, CHONS, CHONP compounds) relative to those unique to the DOM_(squall). Although there was insufficient rainwater available to test DOM_(squall) for its bioavailability, a simple room-temperature incubation of Irene rainwater over 30 days in the dark resulted in its dissolved organic carbon decreasing from 2.3 to 1.5 mg L~(-1). When coupled with the abundant precipitation generally-associated with hurricanes, these results suggest that marine DOM in rainwater may exert unique but substantial impacts to organic matter in coastal aquatic ecosystems.
机译：雨水溶解的有机物（DOM）的特征是两次连续的不同地理来源的沿海暴雨：大西洋飓风（飓风艾琳12011）和陆地鼠。使用结合电喷雾电离傅立叶变换离子回旋共振质谱（FT1CR），稳定碳同位素分析和激发发射荧光光谱的多代理方法，我们证明了大西洋飓风雨水中海洋衍生的有机物的独特组成。艾琳飓风雨水DOM（DOM_（lrene））在分子上不同于陆地（DOM_（squall））。例如，艾琳雨水的δ〜（13）C_（doc）为-19.2±0.13‰，而s流的δ〜（13）C_（doc）为-26.3±0.01‰。使用DOM_（lrene）独有的FTICR分配的峰，相对于DOM_（squall）独有的峰，包含更多相对数量的含氮分子式（代表几种异构的CHON，CHONS，CHONP化合物）。尽管没有足够的雨水来测试DOM_（squall）的生物利用度，但是在黑暗中经过30天的简单艾琳雨水室温温育后，其溶解有机碳从2.3 mg L〜（-1）减少至1.5 mg L〜（-1）。这些结果与通常与飓风有关的大量降水结合在一起，说明在雨水中的海洋DOM可能会对沿海水生生态系统的有机物产生独特但重要的影响。

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  • 来源
    《Marine Chemistry》 |2013年第20期|67-76|共10页
  • 作者

    Siddhartha Mitra; Andrew S. Wozniak; Richard Miller; Patrick G. Hatcher; Christopher Buonassissi; Matthew Brown;

  • 作者单位

    Department of Geological Sciences, East Carolina University, Greenville, NC 27858, United States;

    Department of Chemistry and Biochemistry, Old Dominion University, Norfolk VA 23529, United States;

    Department of Geological Sciences, East Carolina University, Greenville, NC 27858, United States,Institute for Coastal Sciences and Policy, East Carolina University, Greenville, NC 27858, United States;

    Department of Chemistry and Biochemistry, Old Dominion University, Norfolk VA 23529, United States;

    Institute for Coastal Sciences and Policy, East Carolina University, Greenville, NC 27858, United States;

    Department of Geological Sciences, East Carolina University, Greenville, NC 27858, United States;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Hurricane Irene; FTICR; Dissolved organic matter; Coastal carbon;

    机译：艾琳飓风;FTICR;溶解的有机物;沿海碳;

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