README -- describes the contents of soil_NOx_201208/
28 Aug 2012
GEOS-Chem Support Team
geos-chem-support@g.harvard.edu


The data was prepared by Bram Maasakkers and converted to netCDF file 
format by the GEOS-Chem Support Team.


Files:
------

(1) soilNOx.landtype.generic.025x025.nc

       Contains array LANDFRAC(1440,720,24), which is placed on the GENERIC 
       GRID at 0.25 x 0.25 degree resolution.  The array contains the land 
       fractions for the 24 different MODIS/KOPPEN biome types.  

       Because the original data is on 0.25 x 0.25 as well, all the fractions 
       in this file will be either 0 or 1.  When this file is regridded, the 
       values should simply be averaged, giving the fraction of a certain 
       biome type within the (for example 2x2.5) gridbox.

       The data is not pegged to any specific year, so we have timestamped
       it with a "generic" date of 2000/01/01 @ 0h GMT.

          -- Bram Maasakkers (maasakkers@seas.harvard.edu)


(2) soilNOx.climate.generic.05x05.nc

       Contains the following arrays which are placed on the GENERIC GRID
       at 0.5 x 0.5 degree resolution:

          NON_ARID(720,360): Fraction of non-arid soil (excluding water).
                             (The data consists of 1's & 0's at the native
                              resolution of 0.5 x 0.5 degrees.)
   
          ARID(720,360):   : Fraction of arid soil
       
       The soil at grid box (I,J) can be considered ARID if:

          ARID(I,J) > NON_ARID(I,J)
       
       The data is not pegged to any specific year, so we have timestamped
       it with a "generic" date of 2000/01/01 @ 0h GMT.

          -- Bram Maasakkers (maasakkers@seas.harvard.edu)


(3) soilNOx.fert_res.generic.05x05.nc

      Contains the array fert_res(720,360,366), which is placed on the 
      GENERIC GRID at 0.5 x 0.5 degree resolution.  The array contains the 
      reservoir of N associated with manure & chemical fertilizer.  
      Units are ng N/m2.

      The data is available per day (1-366).  The data is not pegged to
      any specific year, so we have timestamped as days from 2000/01/01
      at 0 GMT (2000 being a leap year).

          -- Bram Maasakkers (maasakkers@seas.harvard.edu)