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Implications of ozone depletion for surface-water photochemistry: Sensitivity of clear lakes |
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| Authors: | Norman M Scully Warwick F Vincent David R S Lean William J Cooper |
| Institution: | (1) Département de biologie & Centre d'études nordiques, Université Laval, Sainte-Foy, Québec, G1K 7P4, Canada, CA;(2) Department of Biology, University of Ottawa, P.O. Box 450, Station A, Ottawa, Ontario, K1N 6N5 Canada, CA;(3) Department of Chemistry, University of North Carolina at Wilmington, Wilmington, North Carolina, 28403-3297, USA, US |
| Abstract: | Increased ultraviolet-B radiation (UV-B) in aquatic ecosystems brought about by stratospheric ozone depletion may result in increased formation rates of photochemical reaction products in the surface waters of aquatic ecosystems. In this study, the potential impact of increases in lower wave-length radiation on the formation of hydrogen peroxide (H2O2) and singlet oxygen (1O2) was modelled for lakes over a range of dissolved organic carbon (DOC) concentrations. The impact of increased UV-B radiation on the production of carbon monoxide (CO) was also calculated for two humic stained systems. The relative increases of H2O2 and1O2 production were greater in the clear lakes (70% increase in photochemical reaction rates near the surface) than the coloured systems (25%). Production of CO in the study sites also increased under depleted ozone conditions implying increased DOC losses to the overlying atmosphere. |
| Keywords: | : Hydrogen peroxide dissolved organic carbon ultraviolet radiation ozone depletion climate change lakes |
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