Factors affecting the mixed-layer concentrations of singlet oxygen in sunlit lakes

Partanen, Sarah B.; Apell, Jennifer N.; Lin, Jianming; McNeill, Kristopher

doi:10.1039/d1em00062d

Cited by 7 publications

(1 citation statement)

References 82 publications

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“…It should also be noted that while the case study presented here focuses on triclosan, which primarily transforms via direct photolysis in the environment, the CFs developed in this work can also be applied when modeling indirect photochemical processes. For example, the rate of formation of reactive oxygen species (e.g., singlet oxygen) in the environment is highly dependent on the amount of incoming solar radiation, 38 so incorporating the CFs into these types of modeling efforts would have implications for the calculated steady-state concentration of singlet oxygen and ultimately the half-lives of pollutants reacting with singlet oxygen.…”

Section: Resultsmentioning

confidence: 99%

Global Corrections to Reference Irradiance Spectra for Non-Clear-Sky Conditions

Partanen

McNeill

2023

Environ. Sci. Technol.

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Photochemical reactions in surface waters play important roles in element cycling and in the removal of organic contaminants, among other processes. A central environmental variable affecting photochemical processes in surface waters is the incoming solar irradiance, as this initiates these processes. However, clear-sky incident irradiance spectra are often used when evaluating the fate of aquatic contaminants, leading to an overestimation of contaminant decay rates due to photochemical transformation. In this work, incident irradiance satellite data were used to develop global-scale non-clear-sky correction factors for commonly used reference irradiance spectra. Non-clear-sky conditions can decrease incident irradiance by over 90% depending on the geographic location and time of the year, with latitudes above 40°N being most heavily affected by seasons. The impact of non-clear-sky conditions on contaminant half-lives was illustrated in a case study of triclosan in lake Greifensee, which showed a 39% increase in the triclosan half-life over the course of a year under non-clear-sky conditions. A global annual average correction factor of 0.76 was determined as an approximate way to account for non-clear-sky conditions. The correction factors are developed at monthly and seasonal resolutions for every location on the globe between 70°N and 60°S at a 4 km spatial resolution and can be used by researchers, practitioners, and regulators who need improved estimates of incident irradiance.

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Section: Resultsmentioning

confidence: 99%