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2. Data 

The dataset is based on 1994 July NCEP four-daily reanalyses of standard meteorological variables given in constant pressure levels ranging from surface to 10-hPa and also over isentropic surfaces in the upper troposphere and lower stratosphere. From 100 to 10-hPa, the vertical velocity field was estimated using the thermodynamic equation under adiabatic conditions. Total ozone data from Meteor 3/Toms (version 7) was also used for the period of study, along with ozone mixing ratio profiles from SBUV/2 NOAA-11 (version 6; for reference see ftp://toms.gsfc.nasa.gov/pub/sbuv/sbuv2/readme.v612 ).

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