README -- Contents of aircraft_NOx_200202/
Bob Yantosca
bmy@io.harvard.edu
12 Mar 2002


Files:
------
airapr.4x5 : April     aircraft NOx emissions [kg NOx/4h]
airaug.4x5 : August    aircraft NOx emissions [kg NOx/4h]
airdec.4x5 : December  aircraft NOx emissions [kg NOx/4h]
airfeb.4x5 : February  aircraft NOx emissions [kg NOx/4h]
airjan.4x5 : January   aircraft NOx emissions [kg NOx/4h]
airjul.4x5 : July      aircraft NOx emissions [kg NOx/4h]
airjun.4x5 : June      aircraft NOx emissions [kg NOx/4h]
airmar.4x5 : March     aircraft NOx emissions [kg NOx/4h]
airmay.4x5 : May       aircraft NOx emissions [kg NOx/4h]
airnov.4x5 : November  aircraft NOx emissions [kg NOx/4h]
airoct.4x5 : October   aircraft NOx emissions [kg NOx/4h]
airsep.4x5 : September aircraft NOx emissions [kg NOx/4h]

Files are ASCII format.


Source:
-------
air*.4x5 files were created with the FORTRAN program

	~bmy/archive/data/aircraft_NOx_200203/4x5_geos

using raw data obtained by Yuhang Wang for the baseline year 1992.  Raw data 
files are stored on tape since they are somewhat large.  Contact Bob Yantosca 
(bmy@io.harvard.edu) if you need to access these files.


Notes:
------
(1) air*4x5 files are read into GEOS-CHEM by routine "readair" of
    the F90 module "aircraft_nox_mod.f".  

(2) The data are in a kind of weird unit: [kg NOx/4 hours].  This was
    the way that Yuhang Wang implemented the original code in the GISS-II
    model.  The GISS-II model had a 4-hour timestep so Yuhang adapted the
    emissions from kg/day to kg/4h by dividing by 6.  Since the same routines
    were ported as-is into the GEOS-CHEM, the unit of [kg NOx/4h] stuck.  This
    is later converted to [molec NOx/s] in the GEOS-CHEM code correctly.