README -- Describes contents of the HEMCO/SfcFix/v2019-09 directory
5 Nov 2019

Overview:
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This directory contains NetCDF files of spatially-resolved species concentrations.
These are used by GEOS-Chem/HEMCO to fix concentrations of certain long-lived species
in the planetary boundary layer.

The files for OCS and H2 (surface_vmr_?.nc) contain a spatial field with a single
value for all locations. Values of 500 pptv and 500 ppbv are present for OCS and H2 respectively. Please contact Tomas Sherwen (tomas.sherwen@york.ac.uk) with
any questions or to report any issues about H2/OCS files.

The GMI and UCX subfolders each contain a single NetCDF with spatially and temporally resolved fields for multiple long-lived species. These files were processed from the
existing HEMCO data used by GEOS-Chem (HEMCO/GMI/v2015-02). Please contact Sebastian Eastham (seastham@mit.edu) with any questions or to report any issues about UCX/GMI
files.


File List:
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surface_VMR_H2.nc
surface_VMR_OCS.nc
GMI/surface_VMRs.nc
UCX/surface_VMRs.nc

References:
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Eastham, S. D., Weisenstein, D. K., and Barrett, S. R. H.: Development and evaluation of the unified tropospheric– stratospheric chemistry extension (UCX) for the global chemistry-transport model GEOS-Chem, Atmos. Environ., 89, 52–63, doi:10.1016/j.atmosenv.2014.02.001, 2014.