README -- Contents of soil_NOx_200203/
Bob Yantosca
bmy@io.harvard.edu
12 Mar 2002


Files:
------
climatprep4x5.dat : Monthly soil precipitation [mm/day]

fert_scale.dat    : NOx from fertilized soil, aseasonal [ng N/m2/s]

soiltype.dat      : Lookup table that translates between Olson landtype
		     and soil landtype (as defined by soil emissions code)

All files are ASCII format.


Source:
-------
(1) climatprep4x5.dat was produced by IDL programs

	~bmy/IDL/regrid/regrid_soilprec.pro
	~bmy/IDL/regrid/merge_fert_soilprec.pro

    which uses 1 x 1 soil precipitation data from

	~bmy/archive/data/soil_NOx_200203/1x1_gen/lcprc.asc
	

(2) fert_scale.dat was produced by IDL program
	
	~bmy/IDL/regrid/regrid_fert.pro
	~bmy/IDL/regrid/merge_fert_soilprec.pro

    which uses 1 x 1 soil precipitation data from
	
	~bmy/archive/data/soil_NOx_200203/1x1_gen/newfert.1x1
	
	
(3) Due to the way in which the soil emissions code works, you must
    use IDL program

	~bmy/IDL/regrid/merge_fert_soilprec.pro

    to write out data to only those grid boxes where soil precip 
    and fertilizer data are nonzero.  For the GEOS-CHEM 4 x 5 grid, 
    window region, this comes out to NLAND = 1118 boxes.  You need
    to define NLAND accordingly in GEOS-CHEM header file "commsoil.h".


Notes:
------
(1) climatprep4x5.dat is read into GEOS-CHEM by routine "rdsoil.f"
    fert_scale.dat    is read into GEOS-CHEM by routine "rdsoil.f" 
    soiltype.dat      is read into GEOS-CHEM by routine "rdsoil.f"
 
(2) For more information, see the reference:

    Wang, Y., D.J. Jacob, and J.A. Logan, Global simulation of 
      tropospheric O3-NOx-hydrocarbon chemistry, 1. Model formulation, 
      J. Geophys. Res., 103/D9, 10,713-10,726, 1998.