GEOS-Chem Classic 13.0.0

Release date: 18 Mar 2021

This is the official release for GEOS-Chem 13.0.0. Please see the following links for more information on this version.

Overview

• GEOS-Chem 13.0.0 wiki page
• 13.0.0 milestone

Documentation

• Getting started with GEOS-Chem
• GCHP User's Guide
• HEMCO User's Guide

GEOS-Chem Classic 13.0.0-rc.2

Release date: 17 Mar 2021

This release candidate fixes the following issue identified since 13.0.0-rc.1:

• Restore offline aerosol simulation
• Remove scale factors from DustDead extension and set in HEMCO_Config.rc instead
• Remove setting negative concentrations to zero in mixing_mod.F90 and use error trap instead
• Save OH in ND51 and ND51b binary punch timeseries diagnostics
• Add several fixes for TOMAS simulations
• Fix several issues in specialty simulations identified by integration tests
• Use output from 10-year full-chemistry benchmark for specialty simulations and full-chemistry restart files
• Add stale bot and no-response bots

GEOS-Chem Classic 13.0.0-rc.1

Release date: 13 Jan 2021

This release candidate fixes the following issue identified since 13.0.0-rc.0:

• Changed minimum required CMake version to 3.13

GEOS-Chem Classic 13.0.0-rc.0

Release date: 08 Jan 2021

This is the first release candidate for GEOS-Chem 13.0.0. Major updates since GEOS-Chem 12.9.0 include.

• The GEOS-Chem source code has been split into several repositories:
  • GCClassic: Wrapper for GEOS-Chem Classic
  • GCHP: Wrapper for GCHP (GEOS-Chem in high performance mode)
  • GEOS-Chem: GEOS-Chem science code plus scripts to create GEOS-Chem run directories and integration tests
  • HEMCO: Harmonized Emissions Component code for reading, regridding, and processing data
• 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
• 13.0.0 milestone

Documentation

• Getting started with GEOS-Chem
• GCHP User's Guide
• HEMCO User's Guide

GEOS-Chem Classic 13.0.0-beta.2

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

Structural updates:

• Update GEOS-Chem and HEMCO documentation
• Use all species in tagO3 simulations by default

Bug fixes:

• Add fixes to restore HEMCO standalone simulations
• Do not compress scalar variables in netCDF files

GEOS-Chem Classic 13.0.0-beta.1

This version includes the following updates since GEOS-Chem 13.0.0-beta.0. One-year full-chemistry and transport tracer benchmarks were performed with this version. See the GEOS-Chem 13.0.0 wiki page for more details.

Structural updates:

• Add integration testing for GEOS-Chem Classic and GCHP

Science updates:

• Add CLOCK tracer for diagnosing age of air

Bug fixes:

• Add several bug fixes that were identified by GEOS-Chem integration tests

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