README -- Describes contents of CHEM_INPUTS/CLOUD_J/v2024-09
1 September 2024
GEOS-Chem Support Team
geos-chem-support@g.harvard.edu

Overview:
===============================================================================

This directory contains information for input into the Cloud-J photolysis 
mechanism. It cannot be used with Cloud-J versions prior to v8.0 and
GEOS-Chem versions prior to 14.5.0. All files are a copy of files in
CLOUD_J/2023-05/ with the following changes:

1) Addition to PPN entries in FJX_spec.dat and FJX_j2j.dat for PPN chemistry
   introduced in GEOS-Chem 14.5.0.

2) Removal of CJ77_inp.dat. Fields in this input file are now passed as arguments
   to Cloud-J and can be set in GEOS-Chem configuration file geoschem_config.yml
   starting in v14.5.0.

2) Removal of atmos_* files, as well as FJX-scat-geos.dat, FJX_scat-ssa.dat, and
   FJX_scat-UMa.dat. These files are not used for GEOS-Chem photolysis. They can
   still be found in the example tables provided within the Cloud-J repository
   at github.com/geoschem/cloud-j/

3) Addition of H2O UV absorption cross-sections in FJX_spec.dat which is a new
   feature in Cloud-J v8.0.

Files used in GEOS-Chem:
===============================================================================

NOTE: all files are in ASCII format

FJX_scat-cld.dat : Cloud scattering data

FJX_scat-aer.dat : Aerosol scattering data

FJX_scat-aer.dat : Strat sulfate aerosol cloud scattering data

FJX_spec.dat     : Spectral data

FJX_j2j.dat      : Photolysis reactions