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UNEP-report on the effects of stratospheric ozone depletion published

6 Mar 2019

The latest UNEP-report on the effects of stratospheric ozone depletion has now been published.

The 鈥淢ontreal Protocol on Substances that Deplete the Ozone Layer鈥� is a global agreement to protect the Earth鈥檚 ozone layer by phasing out the production and consumption of ozone-depleting substances, such as CFC鈥檚. The global agreement was signed in 1987 and is an example of a highly successful international effort to protect the biosphere. In fact, the Montreal Protocol has helped to avoid large, and potentially catastrophic, increases of solar UV鈥態 radiation in the biosphere. As part of the Montreal Protocol, the Environmental Effects Assessment Panel assesses impacts of ozone layer depletion and changes in UV-radiation. The panel is made up of scientists from throughout the world, and especially experts in photobiology and photochemistry. Prof. Marcel Jansen is the Irish co-author of the report.

The 2018 report, 鈥淓nvironmental Effects and Interactions of Stratospheric Ozone Depletion, UV Radiation, and Climate Change: 2018 Assessment Report鈥�, also known as the 鈥渘inth Quadrennial Assessment鈥�, has now been published. The full report can be downloaded directly from the UNEP website (). The 381-pages report captures the latest scientific understanding on impacts of ozone layer depletion. The ninth Quadrennial Assessment places strong emphasis on the novel challenge of interactive effects of ozone depletion and climate change on human health and the environment. 

Chapter 3, entitled 鈥淟inkages between stratospheric ozone, UV radiation and climate change:  Implications for terrestrial ecosystems鈥�, assesses the effects of stratospheric ozone depletion and associated changes in ultraviolet-B radiation (UV鈥態, 280-315 nm) on terrestrial biota, and especially the role of climate change in mediating effects of UV鈥態 radiation on organisms and ecosystems. The report states that 鈥渋n some regions ozone depletion is itself contributing to climate change such that ecosystems are being affected by the consequent ozone-driven changes in temperature, precipitation and UV鈥態 radiation鈥�. In other cases interactive effects of ozone depletion, UV鈥態 radiation and climate change impact directly on terrestrial organisms and ecosystems, including agricultural systems. Thus, co-exposure to UV鈥態 and drought, heat or elevated CO₂ levels result in new challenges for living organisms, and for the scientists studying these interactive effects.