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geoschem/geos-chem: GEOS-Chem 12.3.0

The International GEOS-Chem User Community

GEOS-Chem 12.3.0
Released 01 Apr 2019

Contains the following updates:
(1) Update ISORROPIA from v2.0 to v2.2, in order to remove persistent noise in output
(2) Updated PFT file for MEGAN
(3) Bug fix for eruptive volcanic emissions
(4) Read in and regrid existing MODIS LAI and OLSON data via HEMCO
(5) Update from HEMCO version 2.1.011 to 2.1.012
(5a) Bug fixes for the HEMCO interpolation algorithm
(5b) Updates from the NASA GEOS development branch
(5c) Add option to always use simulation year for specified fields
(5d) Prevent zero emissions for MEGAN_Mono extension species
(5e) Updates to the HEMCO volcanic emissions extension
(6) Update to Yuan processed MODIS LAI product (covering years 2005-2016) - Off while we investigate an issue in the HEMCO interpolation
(7) OMI-based Volcanic emissions 2005-2012 (off by default)
(8) Further bug fix for netCDF diagnostics spanning leap years
(9) Fix GFAS_SOAP entry in HEMCO_Config.rc
(10) Tagged CO bug fixes: Fix CO units and write secondary production into a netcdf file
(11) Enable running time backwards in GCHP

For more information about this release. please see:

Also please see the GEOS-Chem online manual at:

This release is compatible with GCHP. See the GCHP online manual for more information:

Learn how you can run GEOS-Chem on the Amazon Web Services cloud computing platform:

Please see the LICENSE.txt and AUTHORS.txt files in the root folder for the GEOS-Chem license description (based on the MIT license) and a complete list of authors. For more information about GEOS-Chem in general, please see and
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