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首页> 外文期刊>Atmospheric environment >Short term temporal variability in the photochemically mediated alteration of chromophoric dissolved organic matter (CDOM) in rainwater
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Short term temporal variability in the photochemically mediated alteration of chromophoric dissolved organic matter (CDOM) in rainwater

机译：雨水中发色溶解有机物（CDOM）的光化学介导变化的短期时间变化

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摘要

The goal of the research presented here was to determine the impact of photochemistry on the abundance and spectral qualities of chromophoric dissolved organic matter (CDOM) in precipitation. The relationship between sunlight and CDOM in rainwater was complex with both production and photo-bleaching of optical properties occurring simultaneously in different regions of the fluorescence excitation emission spectra (EEMs) over relatively short time scales. Spectral slope was inversely correlated with the observed changes in total integrated fluorescence suggesting that photo-induced modifications in the molecular weight of CDOM were occurring along with fluctuations in its optical properties. Atmospheric condensate collected near a high traffic roadway had a response to sunlight similar to authentic rainwater suggesting some fraction of the CDOM in atmospheric waters is derived from local anthropogenic gas phase sources. There was a dramatic increase in fluorescence in two samples photolyzed with photosynthetically active radiation only (PAR; 400-700 nm) compared to analogous samples exposed to full spectrum sunlight indicating that this less energetic light is capable of producing photochemically labile compounds in rainwater. The observed temporal variability in the molecular level response of CDOM to sunlight is important because it may alter the spectral attenuation and the amount of solar radiation reaching the earth's surface.
机译：此处提出的研究目的是确定光化学对降水中发色溶解有机物（CDOM）的丰度和光谱质量的影响。雨水中阳光和CDOM之间的关系非常复杂，因为在相对较短的时间范围内，荧光特性的产生和光漂白同时发生在荧光激发发射光谱（EEM）的不同区域。光谱斜率与观察到的总积分荧光的变化呈负相关，这表明CDOM分子量发生光诱导的修饰以及其光学性质的波动。在高人行车道附近收集的大气冷凝水对日光的响应类似于真实的雨水，这表明大气水中CDOM的一部分来自本地人为气相。与暴露于全光谱阳光下的类似样品相比，仅用光合活性辐射（PAR； 400-700 nm）光解的两个样品中的荧光显着增加，表明这种能量较低的光能够在雨水中产生光化学不稳定的化合物。 CDOM对太阳光的分子水平响应中观察到的时间变异性很重要，因为它可能会改变光谱衰减和到达地球表面的太阳辐射量。

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  • 来源
    《Atmospheric environment》 |2012年第4期|p.112-119|共8页
  • 作者

    Robert J. Kieber; Mary Beth Adams; Joan D. Willey; Robert F. Whitehead; G. Brooks Avery Jr; Katherine M. Mullaugh; Ralph N. Mead;

  • 作者单位

    Department of Chemistry and Biochemistry, University of North Carolina Wilmington, 601 South College Road, Wilmington, NC 28403-5932, United States;

    Department of Chemistry and Biochemistry, University of North Carolina Wilmington, 601 South College Road, Wilmington, NC 28403-5932, United States;

    Department of Chemistry and Biochemistry, University of North Carolina Wilmington, 601 South College Road, Wilmington, NC 28403-5932, United States;

    Department of Chemistry and Biochemistry, University of North Carolina Wilmington, 601 South College Road, Wilmington, NC 28403-5932, United States;

    Department of Chemistry and Biochemistry, University of North Carolina Wilmington, 601 South College Road, Wilmington, NC 28403-5932, United States;

    Department of Chemistry and Biochemistry, University of North Carolina Wilmington, 601 South College Road, Wilmington, NC 28403-5932, United States;

    Department of Chemistry and Biochemistry, University of North Carolina Wilmington, 601 South College Road, Wilmington, NC 28403-5932, United States;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    chromophoric dissolved organic matter; CDOM; photochemistry; rain;

    机译：发色溶解的有机物CDOM;光化学雨;

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