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(American Geophysical Union, 2010-07-27) Laat, A.T.J. de; Van der A., R.J.; Alaart, M.A.F.; Van Wheele, M.; Benítez, G.C.; Casiccia, Claudio; Paes Leme, N.M.; Quel, E.; Salvador, J.; Wolfram, E.
This paper presents an analysis of satellite and groundbased
measurements of total O3 columns and the UV index
of a unique event during the 2009 Antarctic O3 hole season.
From 11 to 30 November 2009 the Antarctic vortex was
located just south of the southern tip of South America
rather than at its climatological position over Antarctica.
Analysis of 30 years of assimilated total O3 column and
UV index measurements shows that this 20‐day event was
unique in the history of the ozone hole for these latitudes.
During this period, small total O3 columns and large UV
index values were observed over the southern tip of South
America. Comparison of ground‐based and satellite measurements
of total O3 columns and satellite based calculations
of the UVI index – never designed nor validated for
such extreme Southern Hemisphere conditions – show excellent
agreement.