README -- Contents of pco_lco_200203/
Bob Yantosca
bmy@io.harvard.edu
18 Dec 2003


Files:
------
COloss.geos1.2x25 : Files containing monthly mean 2-D stratospheric loss rates
COloss.geos3.2x25 :  of CO [s^-1] for the GEOS-1, GEOS-3, and GEOS-STRAT
COloss.geos4.2x25 :  2 x 2.5 grids.  This data is needed for the simple 
COloss.geoss.2x25    stratospheric chemistry, the tagged CO chemistry, and 
                     the CO-OH chemistry. 

COprod.geos1.2x25 : Files containing monthly mean 2-D stratospheric production 
COprod.geos3.2x25 :  rates of CO [v/v/s] for the GEOS-1, GEOS-3, and 
COprod.geos4.2x25 :  GEOS-STRAT 2 x 2.5 grids.  This data is needed for the 
COprod.geoss.2x25    simple stratospheric chemistry, the tagged CO chemistry, 
		     and the CO-OH chemistry. 

All files are in binary punch format.


Source:
-------
The data was taken from the 2-D (lat, alt) stratospheric model of Hans 
Schnieder and Dylan Jones.  The original data, which comes in bins of
5 degrees latitude and on 36 pressure levels is stored in the file:

	~bmy/archive/data/pco_lco_200203/raw/CO.P_L.data

and was regridded to GEOS-CHEM 2 x 2.5 and 4 x 5 grids by the IDL code:

	~bmy/IDL/regrid/regridvh_pco_lco.pro


Notes:
------
(1) COloss.geos*.2x25 and COprod.geos*.2x25 are read into GEOS-CHEM by 
    various routines, including "CO_strat_pl.f", "schem.f", "tagged_co_mod.f",
    and "read_COPminusL.f".

(2) The P(CO) and L(CO) rates are applied in the stratosphere to prevent
    concentrations of CO from building up there to unrealistic values.