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Global modeling of lake-water indirect photochemistry based on the equivalent monochromatic wavelength approximation: The case of the triplet states of chromophoric dissolved organic matter
Water Research ( IF 12.8 ) Pub Date : 2023-05-31 , DOI: 10.1016/j.watres.2023.120153
Luca Carena 1 , Ángela García-Gil 2 , Javier Marugán 2 , Davide Vione 1
Affiliation  

Chromophoric dissolved organic matter (CDOM) plays key role as photosensitizer in sunlit surface-water environments, and it is deeply involved in the photodegradation of contaminants. It has recently been shown that sunlight absorption by CDOM can be conveniently approximated based on its monochromatic absorption at 560 nm. Here we show that such an approximation allows for the assessment of CDOM photoreactions on a wide global scale and, particularly, in the latitude belt between 60°S and 60°N. Global lake databases are currently incomplete as far as water chemistry is concerned, but estimates of the content of organic matter are available. With such data it is possible to assess global steady-state concentrations of CDOM triplet states (3CDOM*), which are predicted to reach particularly high values at Nordic latitudes during summer, due to a combination of high sunlight irradiance and elevated content of organic matter. For the first time to our knowledge, we are able to model an indirect photochemistry process in inland waters around the globe. Implications are discussed for the phototransformation of a contaminant that is mainly degraded by reaction with 3CDOM* (clofibric acid, lipid regulator metabolite), and for the formation of known products on a wide geographic scale.



中文翻译:

基于等效单色波长近似的湖水间接光化学全局建模:发色溶解有机物的三重态情况

发色溶解有机物(CDOM)在阳光照射的地表水环境中作为光敏剂发挥着关键作用,并且深入参与污染物的光降解。最近的研究表明,CDOM 的太阳光吸收可以根据其在 560 nm 处的单色吸收来方便地近似。在这里,我们表明,这种近似可以在全球范围内评估 CDOM 光反应,特别是在南纬 60° 和北纬 60° 之间的纬度带。就水化学而言,全球湖泊数据库目前还不完整,但可以估计有机物的含量。利用这些数据,可以评估 CDOM 三重态的全局稳态浓度(3CDOM*),由于高阳光辐照度和有机物含量升高,预计在夏季北欧纬度地区该值将达到特别高的值。据我们所知,我们第一次能够模拟全球内陆水域的间接光化学过程。讨论了主要通过与3 CDOM*(氯贝酸,脂质调节代谢物)反应降解的污染物的光转化以及在广泛地理范围内形成已知产物的影响。

更新日期:2023-05-31
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