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The response of aquatic ecosystems to the interactive effects of stratospheric ozone depletion, UV radiation, and climate change
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This assessment reviews how changes in UV radiation and climate interact to affect aquatic ecosystems, including impacts on water chemistry and organisms. The breakdown of plastics by UV light is highlighted as a growing concern, since sunlight accelerates the creation of microplastics and nanoplastics in water. These smaller plastic fragments are more easily taken up by aquatic life, increasing the potential for microplastics to enter the human food chain.
Variations in stratospheric ozone and changes in the aquatic environment by climate change and human activity are modifying the exposure of aquatic ecosystems to UV radiation. These shifts in exposure have consequences for the distributions of species, biogeochemical cycles, and services provided by aquatic ecosystems. This Quadrennial Assessment presents the latest knowledge on the multi-faceted interactions between the effects of UV irradiation and climate change, and other anthropogenic activities, and how these conditions are changing aquatic ecosystems. Climate change results in variations in the depth of mixing, the thickness of ice cover, the duration of ice-free conditions and inputs of dissolved organic matter, all of which can either increase or decrease exposure to UV radiation. Anthropogenic activities release oil, UV filters in sunscreens, and microplastics into the aquatic environment that are then modified by UV radiation, frequently amplifying adverse effects on aquatic organisms and their environments. The impacts of these changes in combination with factors such as warming and ocean acidification are considered for aquatic micro-organisms, macroalgae, plants, and animals (floating, swimming, and attached). Minimising the disruptive consequences of these effects on critical services provided by the world's rivers, lakes and oceans (freshwater supply, recreation, transport, and food security) will not only require continued adherence to the Montreal Protocol but also a wider inclusion of solar UV radiation and its effects in studies and/or models of aquatic ecosystems under conditions of the future global climate.
More Papers Like This
The interactive effects of stratospheric ozone depletion, UV radiation, and climate change on aquatic ecosystems
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This assessment reviews how stratospheric ozone depletion and climate change interact to affect UV radiation exposure in aquatic ecosystems. Researchers found that climate change is now the primary driver of UV exposure variations in water, through mechanisms like changing ice cover, water clarity, and mixing depths. The study notes that increased UV exposure can accelerate the breakdown of microplastics and other contaminants in surface waters, highlighting complex interactions between atmospheric changes and aquatic pollution.
Environmental plastics in the context of UV radiation, climate change, and the Montreal Protocol
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This review examines how UV radiation and climate change interact with environmental plastics to alter their degradation rates and toxic profiles, with particular focus on how ozone depletion affects UV-induced plastic fragmentation. The authors argue that changing UV environments under climate change will accelerate plastic breakdown and increase nanoplastic production in surface waters.
Progress on the photo aging mechanism of microplastics and related impact factors in water environment
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This review examined the photo-aging mechanisms of microplastics in aquatic environments, finding that solar UV radiation drives oxidation reactions that alter surface chemistry, fragment particles further, and enhance their capacity to adsorb and release co-occurring pollutants.
Non-Negligible Effects of UV Irradiation on Transformation and Environmental Risks of Microplastics in the Water Environment
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This review examines how UV irradiation drives photoaging of microplastics in aquatic environments, altering their surface chemistry, mechanical properties, and adsorption capacity for co-pollutants, and thereby amplifying their ecotoxicological risks beyond those of virgin plastic particles.
UV-driven fragmentation of plastics in an aquatic environment: laboratory studies
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This laboratory study examined how UV light causes plastic debris in water to fragment into smaller and smaller pieces over time. Understanding the rates and pathways of UV-driven fragmentation is important for predicting how quickly large plastic items break down into the microplastics that eventually enter the food chain.
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