Effects of vertical hydrodynamic mixing on photomineralization of dissolved organic carbon in arctic surface waters
| العنوان: | Effects of vertical hydrodynamic mixing on photomineralization of dissolved organic carbon in arctic surface waters |
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| المؤلفون: | Angang Li, Diogo Bolster, Bethany T. Neilson, Antoine F. Aubeneau, Aaron I. Packman, Rose M. Cory, Tyler V. King |
| المصدر: | Environmental Science: Processes & Impacts. 21:748-760 |
| بيانات النشر: | Royal Society of Chemistry (RSC), 2019. |
| سنة النشر: | 2019 |
| مصطلحات موضوعية: | 010504 meteorology & atmospheric sciences, 010501 environmental sciences, Management, Monitoring, Policy and Law, Atmospheric sciences, 01 natural sciences, Rivers, Dissolved organic carbon, Environmental Chemistry, 14. Life underwater, Mixing (physics), 0105 earth and related environmental sciences, Total organic carbon, Minerals, Suspended solids, Arctic Regions, Public Health, Environmental and Occupational Health, Sediment, General Medicine, Carbon, 6. Clean water, Lakes, Solubility, Arctic, 13. Climate action, Hydrodynamics, Sunlight, Environmental science, Water quality, Surface water |
| الوصف: | Photomineralization, the transformation of dissolved organic carbon (DOC) to CO2 by sunlight, is an important source of CO2 in arctic surface waters. However, quantifying the role of photomineralization in inland waters is limited by the understanding of hydrologic controls on this process. To bridge this gap, this study evaluates mixing limitations, i.e., whether and by how much vertical mixing limits the depth-integrated photomineralization rate, in freshwater systems. We developed a conceptual model to qualitatively assess mixing limitations across the range of light attenuation and hydrologic conditions observed in freshwaters. For the common case of exponential light attenuation over depth, we developed a mathematical model to quantify mixing limitation, and used this model to assess a range of arctic freshwater systems. The results demonstrate that mixing limitations are important when there is significant light attenuation by suspended sediment (SS), which is the case in some arctic, boreal and temperate waters. Mixing limitation is pronounced when light attenuation over depth is strong and when the photomineralization rate at the water surface exceeds the vertical mixing rate. Arctic streams and rivers have strong vertical mixing relative to surface photomineralization, such that model results demonstrate no mixing limitation regardless of how much SS is present. Our analysis indicates that well-mixed assumptions used in prior work are valid in many, but not all, arctic surface waters. The effects of mixing limitations in reducing the photomineralization rate must be considered in arctic lakes with high SS concentrations. |
| تدمد: | 2050-7895 2050-7887 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d05f25878c41c54ef847347a0c6a3c7a https://doi.org/10.1039/c8em00455b |
| حقوق: | CLOSED |
| رقم الأكسشن: | edsair.doi.dedup.....d05f25878c41c54ef847347a0c6a3c7a |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 20507895 20507887 |
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