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首页> 外文期刊>Environmental Science & Technology >Carbon Monoxide Photoproduction from Particles and Solutes in the Delaware Estuary under Contrasting Hydrological Conditions
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Carbon Monoxide Photoproduction from Particles and Solutes in the Delaware Estuary under Contrasting Hydrological Conditions

机译：在相反的水文条件下，特拉华河口的颗粒和溶质产生的一氧化碳

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摘要

Full-spectrum, ultraviolet (UV), and visible broadband apparent quantum yields (AQYs) for carbon monoxide (CO) photoproduction from chromophoric dissolved organic matter (CDOM) and particulate organic matter (POM) were determined in the Delaware Estuary in two hydrologically contrasting seasons in 2012: an unusually low flow in August and a storm-driven high flow in November. Average AQYs for CDOM and POM in November were 10 and 16 times the corresponding AQYs in August. Maximum AQYs in November occurred in a midestuary particle absorption maximum zone. Although POM AQYs were generally smaller than CDOM AQYs, the ratio of the former to the latter increased substantially from the UV to the visible. In both seasons, UV solar radiation was the primary driver for CO photoproduction from CDOM whereas visible light was the principal contributor to POM-based CO photoproduction. CDOM dominated CO photoproduction in the uppermost water layer while POM prevailed at deeper depths. On a depth-integrated basis, the Delaware Estuary shifted from a CDOM-dominated system in August to a POM-dominated system in November with respect to CO photoproduction. This study reveals that flood events may enhance photochemical cycling of terrigenous organic matter and switch the primary photochemical driver from CDOM to POM.
机译：在特拉华州河口通过两次水文对比确定了从发色溶解有机物（CDOM）和颗粒有机物（POM）产生的一氧化碳（CO）光生产的一氧化碳（CO）光产生的全光谱，紫外（UV）和可见宽带表观量子产率（AQYs）。 2012年的旺季：8月异常低的流量，11月受到风暴驱动的高流量。 11月份CDOM和POM的平均AQY分别是8月份相应AQY的10和16倍。 11月的最大AQY发生在河口中部最大颗粒吸收区。尽管POM AQY通常小于CDOM AQY，但前者与后者的比率从UV到可见光显着增加。在这两个季节中，紫外线太阳辐射都是CDOM产生CO相片的主要驱动力，而可见光是基于POM的CO相片的主要贡献者。 CDOM在最上层水层中主导着CO的光生产，而POM在更深的深度占主导。在深度整合的基础上，就CO照相生产而言，特拉华河口从8月的CDOM为主系统转变为11月的POM为主的系统。这项研究表明，洪水事件可能会增强陆生有机质的光化学循环，并将主要的光化学驱动力从CDOM转变为POM。

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  • 来源
    《Environmental Science & Technology》 |2015年第24期|14048-14056|共9页
  • 作者

    Guisheng Song; John D. Richardson; James P. Werner; Huixiang Xie; David J. Kieber;

  • 作者单位

    Institut des Sciences de la Mer de Rimouski, Universite du Quebec a Rimouski, 310 Allee des Ursulines, Rimouski, Quebec G5L 3A1, Canada,College of Marine and Environmental Sciences, Tianjin University of Science and Technology, 29 13th Avenue, TEDA, Tianjin 300457, P.R. China;

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

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

    Institut des Sciences de la Mer de Rimouski, Universite du Quebec a Rimouski, 310 Allee des Ursulines, Rimouski, Quebec G5L 3A1, Canada;

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