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首页> 外文期刊>Environmental Science & Technology >Origin and Sources of Dissolved Organic Matter in Snow on the East Antarctic Ice Sheet
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Origin and Sources of Dissolved Organic Matter in Snow on the East Antarctic Ice Sheet

机译：南极东部冰原上雪中溶解有机物的起源和来源

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摘要

Polar ice sheets hold a significant pool of the world's carbon reserve and are an integral component of the global carbon cycle. Yet, organic carbon composition and cycling in these systems is least understood. Here, we use ultrahigh resolution mass spectrometry to elucidate, at an unprecedented level, molecular details of dissolved organic matter (DOM) in Antarctic snow.Tens of thousands of distinct molecular species are identified, providing clues to the nature and sources of organic carbon in Antarctica. We show that many of the identified supraglacial organic matter formulas are consistent with material from microbial sources, and terrestrial inputs of vascular plant-derived materials are likely more important sources of organic carbon to Antarctica than previously thought. Mack carbon-like material apparently originating from biomass burning in South America is also present, while a smaller fraction originated from soil humics and appears to be photochemically or microbially modified. In addition to remote continental sources, we document signals of oceanic emissions of primary aerosols and secondary organic aerosol precursors. The new insights on the diversity of organic species in Antarctic snowpack reinforce the importance of studying organic carbon associated with the Earth's polar regions in the face of changing climate.
机译：极地冰盖蕴藏着世界上大量的碳储量，并且是全球碳循环的组成部分。然而，对这些系统中有机碳的组成和循环的了解却最少。在这里，我们使用超高分辨率质谱在前所未有的水平上阐明了南极雪中溶解有机物（DOM）的分子细节，并鉴定了成千上万种不同的分子种类，从而为了解南极雪中有机碳的性质和来源提供了线索南极洲。我们表明，许多已确定的超界面有机物配方与微生物来源的物质一致，维管植物来源的物质的地面输入可能比以前认为的更重要的南极有机碳来源。还存在明显源自南美生物质燃烧的类似麦克的碳材料，而一小部分源自土壤腐殖质，似乎已被光化学或微生物修饰。除了偏远的大陆来源外，我们还记录了主要气溶胶和次要有机气溶胶前体海洋排放的信号。关于南极积雪中有机物种多样性的新见解进一步强调了面对气候变化，研究与地球极地地区有关的有机碳的重要性。

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  • 来源
    《Environmental Science & Technology》 |2014年第11期|6151-6159|共9页
  • 作者

    Runa Antony; Amanda M. Grannas; Amanda S. Willoughby; Rachel L. Sleighter; Meloth Thamban; Patrick G. Hatcher;

  • 作者单位

    National Centre for Antarctic and Ocean Research, Headland Sada, Vasco-Da-Gama, Goa 403 804, India;

    Villanova University, Department of Chemistry, Villanova, Pennsylvania 19085, United States;

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

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

    National Centre for Antarctic and Ocean Research, Headland Sada, Vasco-Da-Gama, Goa 403 804, India;

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

  • 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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  • 正文语种 eng
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