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+Basics: Proxies |APSC| and |VPSC|
+===================================
+
+
+|APSC| specifies the area at a certain height, which is below a
+typical temperature threshold below which the chlorine-catalyzed polar
+ozone depletion takes place.  |VPSC| is the corresponding volume in a
+given height range (here: 14-22 km).  Here the average value of this
+size between mid December and the end of March is considered.  Since
+usually in cold arctic winters there is a stable polar vortex, it has
+been found empirically that this quantity can provide good
+approximations for ozone depletion [#]_.  High values of [VPSC] mean
+high ozone losses.
+
+
+.. |APSC| replace:: A\ :sub:`PSC`\ 
+.. |VPSC| replace:: V\ :sub:`PSC`\ 
+.. |H2O| replace:: H\ :sub:`2`\ O
+.. [#] see e.g. Rex, M. et al., Geophys. Res. Lett., 31, doi:10.1029/2003GL018844, 2004
+