README -- Contents of /pub/geos-chem/data/GEOS_2x2.5/aircraft_NOx_200202/
03 Mar 2010
Bob Yantosca and Claire Carouge
geos-chem-support@g.harvard.edu


Data Download:
===============================================================================

The files in this directory may be accessed by FTP download:

   ftp ftp.as.harvard.edu
   cd pub/geos-chem/data/GEOS_2x2.5/aircraft_NOx_200202/

You may also use "wget" download:

   wget -r -nH "ftp://ftp.as.harvard.edu/pub/geos-chem/data/GEOS_2x2.5/aircraft_NOx_200202/"


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

airapr.2x25 : April     aircraft NOx emissions [kg NOx/4h]
airaug.2x25 : August    aircraft NOx emissions [kg NOx/4h]
airdec.2x25 : December  aircraft NOx emissions [kg NOx/4h]
airfeb.2x25 : February  aircraft NOx emissions [kg NOx/4h]
airjan.2x25 : January   aircraft NOx emissions [kg NOx/4h]
airjul.2x25 : July      aircraft NOx emissions [kg NOx/4h]
airjun.2x25 : June      aircraft NOx emissions [kg NOx/4h]
airmar.2x25 : March     aircraft NOx emissions [kg NOx/4h]
airmay.2x25 : May       aircraft NOx emissions [kg NOx/4h]
airnov.2x25 : November  aircraft NOx emissions [kg NOx/4h]
airoct.2x25 : October   aircraft NOx emissions [kg NOx/4h]
airsep.2x25 : September aircraft NOx emissions [kg NOx/4h]

Files are ASCII format.


Source:
===============================================================================

air*.2x25 files were created with the FORTRAN program

	~bmy/archive/data/aircraft_NOx_200203/2x25_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*2x25 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.