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首页> 外文期刊>Environmental Science & Technology >Factors affecting the efficiency of carbon monoxide photoproduction in the St. Lawrence estuarine system (Canada)
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Factors affecting the efficiency of carbon monoxide photoproduction in the St. Lawrence estuarine system (Canada)

机译：在圣劳伦斯河口系统（加拿大）中影响一氧化碳光生产效率的因素

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This study examined the effects of water temperature and the origin (terrestrial vs marine) and light history of chromophoric dissolved organic matter (CDOM) on the apparent quantum yields of carbon monoxide (CO) photoproduction for water samples collected along a salinity gradient (salinity range: 0-33) in the St. Lawrence estuarine system (Canada). The solar insolation-weighted mean apparent quantum yield of CO (Phi CO) decreased as much as fourfold with increasing salinity and showed a strong positive correlation with the dissolved organic carbonspecific absorption coefficient at 254 nm. This suggests that terrestrial CDOM is more efficient at photochemically producing CO than is marine algae-derived CDOM and that aromatic moieties are likely involved in this photoprocess. CDOM photobleaching, mainly at the very early stage, dramatically decreased h CO (by up to 6.4 times) for low-salinity samples, but photobleaching had little effect on the most marine sample. For a 20 C increase in temperature, h CO increased by similar to 70% for low-salinity samples and 30-40% for saline samples. This study demonstrates that water temperature, as well as the CDOM's origin and light history, strongly affect the efficiency of CO photoproduction. These factors should be taken into account in modeling the photochemical fluxes of CO and other related CDOM photoproducts on varying spatiotemporal scales.
机译：这项研究检查了水温和盐分溶解有机物（CDOM）的起源，水生发色（CDOM）对沿盐度梯度（盐度范围）收集的水样品的一氧化碳（CO）光生产的表观量子产率的影响。 ：0-33）在圣劳伦斯河口系统（加拿大）中。日照加权平均CO的表观量子产率（Phi CO）随着盐度的增加而降低了四倍，并且与254 nm处的溶解有机碳比吸收系数显示出很强的正相关。这表明，陆地CDOM在光化学生产CO方面比海藻衍生的CDOM更有效，并且芳香族部分可能参与了该光过程。 CDOM光漂白（主要是在很早的阶段）就使低盐度样品的h CO显着降低（高达6.4倍），但光漂白对大多数海洋样品几乎没有影响。温度升高20 C时，低盐度样品的h CO升高约70％，盐溶液样品的h CO升高30-40％。这项研究表明，水温以及CDOM的起源和光历史强烈影响CO照相生产的效率。在模拟CO和其他相关CDOM光产物在不同时空尺度上的光化学通量时，应考虑这些因素。

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