README -- Describes contents of HEMCO/CO2/v2015-04/CHEM
27 Feb 2017
GEOS-Chem Support Team
geos-chem-support@g.harvard.edu


Overview:
===============================================================================

These files are for CO2 chemical production and the associated surface 
correction for the GEOS-Chem CO2 simulation.  Chemical source files have been 
archived from GEOS-Chem carbon monoxide (CO) loss rates. CH4 sources (for the 
surface correction are from Kevin Wecht. Isoprene and Monoterpene (for surface 
correction) are from the MEGAN inventory. Justification and implementation are
described in Suntharalingam et al. 2005 and Nassar et al. 2010.

The original data files were supplied by Ray Nassar.
Bob Yantosca edited the files for better COARDS compliance.


Files:
===============================================================================

###############################################################################
#####   NOTE: The netCDF file attribute 'lev:positive = "up"' was added   #####
#####   to all files in CO2/v2015-04/CHEM having a vertical dimension.    #####
#####   This was done to facilitate reading these files with GCHP.        #####
#####      -- Bob Yantosca (27 Feb 2017)                                  #####
###############################################################################

CO2_prod_rates.geos4.2x25.30L.nc

 -- Chemical source of CO2

    Resolution  : GEOS-CHEM 2 x 2.5 grid (144 x 91 boxes x 30 levels, GEOS-4)
    Units       : kg m-2 s-1
    Timestamps  : Monthly, 2004/01 thru 2006/12
    Compression : Level 1 (e.g. nccopy -d1)


CO2_prod_rates.geos5.2x25.47L.nc

 -- Chemical source of CO2

    Resolution  : GEOS-Chem 2 x 2.5 grid (144 x 91 boxes x 47 levels, GEOS-5)
    Units       : kg m-2 s-1
    Timestamps  : Monthly, 2004/01 thru 2010/12
    Compression : Level 1 (e.g. nccopy -d1)


CH4_source.geos.2x25.nc
 
 -- Chemical source of CH4

    Resolution  : GEOS-Chem 2 x 2.5 grid (144 x 91 boxes)
    Units       : kg m-2 s-1
    Timestamps  : Monthly, 2004/01 thru 2004/12
    Compression : Level 1 (e.g. nccopy -d1)


Isoprene-2004.geos.2x25.nc
Monoterpene-2004.geos.2x25.nc

 -- Biogenic isoprene and monoterpene emissions

    Resolution  : GEOS-Chem 2 x 2.5 grid (144 x 91 boxes)
    Units       : kg carbon m-2 s-1 
    Timestamps  : Monthly, 2004/01 thru 2004/12
    Compression : Level 1 (e.g. nccopy -d1)



References:
===============================================================================

Chemical Source and suface correction:

Nassar, R., D.B.A. Jones, P. Suntharalingam, J.M. Chen, R.J. Andres, K.J. 
  Wecht, R.M. Yantosca, S.S. Kulawik, K.W. Bowman, J.R. Worden, T. Machida and
  H. Matsueda (2010), Modeling global atmospheric CO2 with improved emission 
  inventories and CO2 production from the oxidation of other carbon species, 
  Geoscientific Model Development, 3, 689-716.

Suntharalingam, P., J. T. Randerson, N. Krakauer, J. A. Logan, and D. J. Jacob 
  (2005), Influence of reduced carbon emissions and oxidation on the 
  distribution of atmospheric CO2: Implications for inversion analyses, 
  Global Biogeochem. Cycles, 19, GB4003.

Isoprene and Monoterpene:

Guenther, A. (2007) Corrigendum to "Estimates of global terrestrial isoprene 
  emissions using MEGAN (Model of Emissions of Gases and Aerosols from Nature)"
  published in Atmos. Chem. Phys., 6, 3181?3210, 2006, Atmos. Chem. Phys., 7, 
  4327-4327.

Guenther, A., Karl, T., Harley, P., Wiedinmyer, C., Palmer, P. I., and Geron, 
  C. (2006), Estimates of global terrestrial isoprene emissions using MEGAN 
  (Model of Emissions of Gases and Aerosols from Nature), Atmos. Chem. Phys., 6, 
  3181-3210.


Also see our wiki page: http://wiki.geos-chem.org/CO2_simulation