A paper by BSI senior scientist Dr. Germar Bernhard and seven co-authors titled "High levels of ultraviolet radiation observed by ground-based instruments below the 2011 Arctic ozone hole" has been published by Atmospheric Chemistry and Physics. Measurements at 13 Arctic and Scandinavian locations performed in 2011 are compared with historical data. Observations of UV spectroradiometers operated by BSI as part of NSF's Arctic Monitoring Network contributed to this study. The paper is available here.