The edge of the Antarctic ozone hole shifted and then stalled over the southern tip of South America for nearly three weeks in November 2009, exposing people in Tierra del Fuego to double the normal levels of ultraviolet radiation for the area. The anomaly provided an opportunity to test monitoring systems for ozone and ultraviolet radiation during extreme conditions.
Jos de Laat of the Royal Netherlands Meteorological Institute in de Bilt and his colleagues found that ozone and ultraviolet radiation measurements from three ground stations lined up well with ozone data from a sensor aboard the European Space Agency's Envisat satellite. Algorithms for calculating the 'ultraviolet radiation index' from satellite data were also able to produce correct values for the period.
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Atmospheric chemistry: A wandering ozone hole. Nature 467, 135 (2010). https://doi.org/10.1038/467135a
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DOI: https://doi.org/10.1038/467135a
