Structure and evolution of the polar stratosphere and mesosphere and links to the troposphere during the International Polar Year, 2007-2009 (SPARC IPY)

There are six individual sets of model results in this dataset. Some details are listed below (full lists of modelled variables are provided in the accompanying README file). 1. ECMWF (European Centre for Medium-range Weather Forecasts): Native format: GRIB; Horizontal grid: 1440 longitudes x 721 latitudes (.25 x .25 degree grid); Vertical grid: 91 hybrid model levels to 0.01 hPa; 7 modelled variables; Dates available: 01 June 2007 to 31 May 2009. 2. NCEP (National Centers for Environmental Prediction): Native Format: GRIB; Horizontal grid: 1152 longitudes x 576 latitudes (~0.313 x 0.313 degrees); Vertical grid: 64 model levels to ~0.2 hPa; 10 modelled variables; Dates available: 01 April 2007 to 14 June 2009. 3. UKMO (United Kingdom Meteorological Office): Native Format: NetCDF once per day (both regular and UARS); Horizontal grid: 640 longitudes x 480 latitudes (0.5625 x 0.375 degrees)/UARS: 96 longitudes x 73 latitudes (3.75 x 2.5 degrees); Vertical grid: 30 pressure levels to 0.1 mbar/UARS: 25 levels to 0.1 mbar; 5 modelled variables; Dates available: 01 April 2007 to 31 March 2009. 4. GMAO (Global Modeling and Assimilation Office, NASA): Native Format: HDF; Horizontal grid: 540 longitudes x 361 latitudes (0.6667 x 0.5 degrees); Vertical grid: 72 model layers to 0.01 hPa; 15 modelled variables; Dates available: 01 June 2007 to 31 May 2009. 5. CMAM-FDAM (Canadian Middle Atmosphere Model - Facility for Data Assimilation and Modelling): Native Format: NetCDF/CCCma; Horizontal grid: 97 longitudes x 48 latitudes (~3.75 x 3.75 degree Gaussian grid); Vertical grid: 71 model levels to ~0.082 hPa; 27 modelled variables; Dates available: 01 November 2005 to 31 December 2009. 6. GEM-BACH (Global Environmental Multi-scale coupled with Belgium Atmospheric CHemistry): Native Format: NetCDF; Horizontal grid: 240 longitudes x 120 latitudes (1.5 x 1.5 degrees); Vertical grid: 80 model levels to ~0.125 hPa; 20 modelled variables; Dates available: 01 March 2007 to 28 February 2009.