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     Multi-Sensor AAI data record / Absorbing Aerosol Index and residues
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     The following datasets are available:

../daily/data/YYYY/ESACCI-AEROSOL-L3-AAI-MSAAI-1D-YYYYMMDD-fv1.7.nc

     NetCDF file with gridded daily Multi-Sensor residues from year YYYY, 
     month MM, and day DD. The data in this NetCDF file are contained in 
     a 2-dimensional grid (with cells of 1 x 1 degrees).

     Longitude: 360 bins centered on 179.5 W to 179.5 E (1 degree steps)
     Latitude : 180 bins centered on  89.5 S to  89.5 N (1 degree steps)

     The average residue is provided, along with the number of 
     measurements for each of the grid cells. The average AAI is also 
     provided. This is an average of the *positive* residues only.

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../monthly/data/YYYY/ESACCI-AEROSOL-L3-AAI-MSAAI-1M-YYYYMM-fv1.7.nc

     NetCDF file with gridded monthly Multi-Sensor residues from year YYYY
     and month MM. The format is the same as for the daily gridded data.

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     The following image files are available:

../monthly/images/YYYY/Multi-Sensor_AAI_map_YYYYMM.png

     Image files of the gridded monthly averaged AAI are available in
     PNG format. These files present the monthly averaged AAI of year
     YYYY and month MM projected onto the world map.

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     References (follow the links on the webpage to download):

[01] L.G. Tilstra, M. de Graaf, O.N.E. Tuinder, R.J. van der A, and P.
     Stammes, Studying trends in aerosol presence using the Absorbing
     Aerosol Index derived from GOME-1, SCIAMACHY, and GOME-2,
     EUMETSAT P.59, 2011.

[02] L.G. Tilstra, M. de Graaf, O.N.E. Tuinder, R.J. van der A, and P.
     Stammes, Monitoring aerosol presence over a 15-year period using the
     Absorbing Aerosol Index measured by GOME-1, SCIAMACHY, and GOME-2,  
     ESA SP-722, 2014.

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