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+UV increase due to ozone loss
+=============================
+
+The chemical depletion of ozone in the stratosphere causes an increase
+of ultraviolet radiation on the ground. The UV index is a measure of
+the danger of the UV radiation.  It corresponds to the
+sunburn-effective solar irradiance.
+
+This is a sample calculation [#FN1]_, how the UV index typically
+changes at a certain latitude in winter and spring.  Shown are
+noontime values of the UV index at clear sky for the range of the
+observed ozone columns of the years 2000 and 2012 (black) and
+corresponding values for a given decrease the ozone column (blue). The
+selection of the two values for geographical latitude and ozone loss
+can be altered.  The anthropogenically induced polar ozone depletion
+takes place within the polar vortex, which in winter and spring is
+well separated from the mid-latitudes.  After the breakdown of the
+polar vortex (in the Northern hemisphere typically at the latest in
+early April), ozone-rich air from mid-latitudes will be transported
+back into the polar regions.
+
+In contrast to the Southern hemisphere, there are typically no
+significant increases tO very high UV indices in polar high latitudes
+in the Northern hemisphere in the relevant period until April.
+
+These graphs show how the maximum UV index (at noontime at clear sky)
+would change due to ozone depletion in the Arctic polar vortex.
+
+
+
+
+
+
+
+.. [#FN1] The mean values and standard deviations of the ozone columns were calculated from the database of Bodeker-Scientific (http://www.bodekerscientific.com).  Calculation of the UV index for cloudless sky according to the method of Allaart et al. (Meteorological Applications, 11, 59-65, 2004)