README -- Contents of dust_200203/
Bob Yantosca
bmy@io.harvard.edu
09 Jan 2004


Files:
------
dust.geos1.2x25      : Mineral dust concentrations [kg/m3] at 7 wavelength 
		        bins for the GEOS-1 2 x 2.5 grid.

dust.geos3.2x25      : Mineral dust concentrations [kg/m3] at 7 wavelength 
		        bins for the GEOS-3 2 x 2.5 grid.

dust.geos4.2x25      : Mineral dust concentrations [kg/m3] at 7 wavelength 
		        bins for the GEOS-4 2 x 2.5 grid.

dust.geoss.2x25.1996 : Mineral dust concentrations [kg/m3] at 7 wavelength 
dust.geoss.2x25.1997 :  bins for the GEOS-STRAT 2 x 2.5 grid, for specific
		        years 1996, 1997.

All files are in binary punch format.  


Source:
-------
Paul Ginoux produced mineral dust concentrations using the GSFC/GOCART model 
for the GEOS-1 2 x 2.5 grid (1990) and for the GEOS-STRAT 2 x 2.5 grid (1996,
1997).  These files are stored on tape since they are quite huge.  Please
contact Randall Martin (rvm@io.harvard.edu) for more information.  Paul 
Ginoux (ginoux@rondo.gsfc.nasa.gov) probably also has them archived on the
Unitree mass storage system at GSFC.

The GEOS-1 and GEOS-STRAT 2 x 2.5 dust fields were converted into binary 
punch file format by the IDL code:

	~bmy/IDL/regrid/regridh_dust.pro 
        (NOTE: This option is no longer valid)

The GEOS-STRAT 2 x 2.5 dust fields for 1996 were then regridded vertically
to the GEOS-3 and GEOS-4 grids 2 x 2.5 grid by the code:

	~bmy/IDL/regrid/regridv_dust.pro

The GEOS-1, GEOS-STRAT, GEOS-3 and GEOS-4 files at 2 x 2.5 vertical resolution
were then regridded to 4 x 5 resolution by the IDL code:

	~bmy/IDL/regrid/regridh_dust.pro


Notes:
------
(1) dust.geos*.2x25* are read into GEOS-CHEM by routine "rdust.f".

(2) The data contained in "dust.geos*.2x25*" is used to compute mineral
    dust optical depths for the FAST-J photolysis code.  It is also 
    used in the SMVGEAR chemistry mechanism to facilitate heterogeneous
    chemistry.