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geoschem/GCHP 13.0.0-rc.0: GEOS-Chem 13.0.0 release candidate (in GCHP mode)

The International GEOS-Chem User Community

This is the first release candidate for GCHP 13.0.0. Major updates since GCHP 12.9.0 include.

- This repository replaces the older GCHP legacy repository and contains the following changes:
   - NASA-maintained libraries are now submodules
   - GEOS-Chem and HEMCO codes have been split into separate submodules
   - ESMF is now an external dependency
   - A stretched-grid option has been introduced
- MERRA-2 is the recommended meteorology field over GEOS-FP
- CMake is the default build system; Support for GNU Make has been retired
- Carbon based units for VOC species have been removed
- CEDS GDB-MAPS is now the default anthropogenic emissions inventory
- The "tropchem" chemistry mechanism has been retired
- Several issues with the RRTMG diagnostics have been resolved

Please see the following links for more information on this version.

## Overview

- [GEOS-Chem 13.0.0 wiki page](
- [GEOS-Chem 13.0.0 milestone](
- [GCHP 13.0.0 milestone](
- [GCHP Github repo](

## Documentation

- [Getting started with GEOS-Chem](
- [GCHP User's Guide](
- [HEMCO User's Guide](

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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