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Summary UV Bulletin
UV bulletins are short reports on current UV levels at NSF network locations. They are posted bi-weekly between September and December when the "ozone hole" affects UV levels at our austral sites.
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Summary of the 2005 ozone hole season, issued 12/16/07
UV levels measured by the NSF UV Monitoring Network during the 2005 ozone hole period generally fell within the range of historic observations. At McMurdo Station, comparatively high UV values were measured between 10/21/05 and 10/25/05 when total ozone fell below 150 DU. At Palmer Station, UV levels peaked between 11/2/05 and 11/7/05, when the center of the ozone hole was displaced toward the Antarctic peninsula. At the South Pole, maximum UV levels were observed on 12/12/05 when total ozone dropped below 200 DU and the Sun's elevation above the horizon was close to its annual maximum. Ushuaia experienced a marked increase in UV on 10/8/05 when a large portion of the ozone hole passed over South America. For example, the noon-time UV Index at Ushuaia increased from 3.6 on 10/6/05 to 8.2 on 10/8/05. Similar spikes in UV radiation were observed also on 11/1/05 and 11/8/05. UV Indices as high as 11 have been measured at Ushuaia historically during similar episodes of low total ozone.
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