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