GEOS-Chem Classic 13.0.0-beta.0

This version includes the following updates since GEOS-Chem 12.9.0. A 1-month full-chemistry benchmark was performed with this version. See the GEOS-Chem 13.0.0 wiki page for more details.

Structural updates:

• Create new GCClassic wrapper repository
• Separate HEMCO from GEOS-Chem to use as a git submodule in GCClassic in GCHPctm
• Retire the GEOS-Chem Unit Tester repository and move GEOS-Chem run directory creation to the GEOS-Chem repository
• Retire the GNU Make build system in both GEOS-Chem Classic and GCHP and replace with CMake
• Updates to GEOS-Chem and HEMCO interface for compatibility with CESM
• Removal of HEMCO code from within the non-local PBL mixing modules
• Dynamically allocate diagnostic arrays based on HISTORY.rc content to minimize memory footprint
• Add global mean OH and CH4 lifetime diagnostics

Science updates:

• CEDS_GBD-MAPS emission inventory (1970 - 2017)
• Retire carbon-based units for VOCs
• Retire tropchem chemistry mechanism
• Implement a new tropchem simulation using Standard mechanism below the tropopause and archived P/L rates above
• Update QFED emissions through July 2020
• ODIAC fossil fuel emissions for CO2 simulations
• Global Hg emissions from Streets et al. (2019) (as option)
• Global Hg emissions from EDGARv4.tox2 (as option)
• Global Inventory of Methane Emissions from Fuel Exploitation

Bug fixes:

• Heterogeneous chem fixes, performance improvements, and clarification
• Fix handling of NOx coefficients in ucx_mod.F90
• Prevent divide-by-zero errors in UCX routine UCX_NOX
• RRTMG fixes and updates