UV radiation below an Arctic vortex with severe ozone depletion

• Published in: Atmospheric Chemistry and Physics
• Main Authors: Knudsen, B. M., Jønch-Sørensen, H., Eriksen, P., Johnsen, B. J., Bodeker, G. E.
• Format: Article in Journal/Newspaper
• Language: English
• Published: Copernicus Publications 2005
• Subjects: article; Verlagsveröffentlichung; Arctic
• Online Access: https://doi.org/10.5194/acp-5-2981-2005; https://noa.gwlb.de/receive/cop_mods_00048997; https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00048617/acp-5-2981-2005.pdf; https://acp.copernicus.org/articles/5/2981/2005/acp-5-2981-2005.pdf

The erythemally weighted (UV) irradiance below the severely depleted Arctic vortices in spring 1996 and 1997 were substantially elevated. On average the UV increased 36 and 33% relative to the 1979-1981 mean assuming clear skies from day 80-100 in 1996 and 1997, respectively. On clear sky days large regions of the Arctic experienced maximum UV increases exceeding 70 and 50% on single days in 1996 and 1997, respectively. A minor fraction of these increases are not anthropogenic and have a dynamical origin as seen by comparison to 1982, when hardly any ozone depletion is expected.