View source for GEOS-Chem 13.4.0

'''''[[GEOS-Chem_versions|GEOS-Chem Versions Page]]'''''

This page includes information about GEOS-Chem 13.4.0 (currently under development)

=== Version overview ===

The following items have been added to GEOS-Chem 13.4.0 since the last GEOS-Chem version [[GEOS-Chem 13.3.1]].  Also see the following Github pages:
*[https://github.com/geoschem/geos-chem/milestone/27 13.4.0 milestone for geoschem/geos-chem]
*[https://github.com/geoschem/GCHP/milestone/10 13.4.0 milestone for geoschem/GCHP]

{| border=1 cellspacing=0 cellpadding=5 
|-bgcolor="#CCCCCC"
!width="500px"|Feature
!width="200px"|Contributor(s)
!width="100px"|Model scope
!width="300px"|Notes and references

|-valign="top"
!colspan="4" bgcolor="#CCFFFF"|Updates that will affect full-chemistry benchmark simulations

|-valign="top"
|[https://github.com/geoschem/geos-chem/issues/1001 Fix bug in Henry law CALC_HEFF routine in hetchem computations]
|Viral Shah (Harvard)
|Chemistry
|
* [https://github.com/geoschem/geos-chem/pull/961 geoschem/geos-chem PR #1042]
* [https://github.com/geoschem/geos-chem/pull/961 geoschem/geos-chem #1001]

|-valign="top"
|[https://github.com/geoschem/geos-chem/issues/1034 Bug fix: Remove double-counting of HCl uptake on acidic sea salt]
|Viral Shah (Harvard)
|Chemistry
|
* [https://github.com/geoschem/geos-chem/pull/1041 geoschem/geos-chem PR #1041]
* [https://github.com/geoschem/geos-chem/pull/961 geoschem/geos-chem #1034]

|-valign="top"
|[https://github.com/geoschem/geos-chem/issues/997 Update surface resistance for ozone deposition to ice/snow]
|Ryan Pound (York)<br>Shuting Zhai (UW)
|Drydep
|
*[https://github.com/geoschem/geos-chem/pull/1055 geoschem/geos-chem PR #1055]
*[https://github.com/geoschem/geos-chem/issues/997 geoschem/geos-chem #997]

|-valign="top"
|[https://github.com/geoschem/geos-chem/pull/992 Use updated definition of PM2.5; Add PM10 diagnostic]
|Bob Yantosca (GCST)
|Diagnostics &<br>Benchmarking
|
*[https://github.com/geoschem/geos-chem/pull/985 geoschem/geos-chem PR #992]
*[https://wiki.geos-chem.org/Particulate_matter_in_GEOS-Chem Particulate Matter in GEOS-Chem (wiki)]
*This update will cause PM2.5 diagnostic output to change slightly, which will be reflected as differences in benchmark plots

|-valign="top"
|[https://github.com/geoschem/HEMCO/pull/121 HEMCO bug fix: restore archiving via manual diagnostics (which had been inadvertently disabled in a prior update)]
|Melissa Sulprizio (GCST)<br>Bob Yantosca (GCST)
|Emissions
|
* [https://github.com/geoschem/HEMCO/pull/121 geoschem/HEMCO PR #121]
* Causes minor changes (less than 0.3%) in biogenic emissions, because the HEMCO MEGAN extension uses manual diagnostics internally.  For more details, [https://github.com/geoschem/HEMCO/pull/121#issuecomment-985624601 see this Github comment].

|-valign="top"
|[https://github.com/geoschem/geos-chem/issues/1005 Use degassing-only volcano emissions in GEOS-Chem benchmark simulations]
|Christoph Keller (GMAO)<br>Daniel Jacob (Harvard)
|Emissions &<br>Benchmarking
|
* [https://github.com/geoschem/geos-chem/pull/961 geoschem/geos-chem #1005]
* This will make it easier to compare results to past benchmarks in case the benchmark year should change.

|-valign="top"
!colspan="4" bgcolor="#CCFFFF"|Updates that will NOT affect full-chemistry benchmark simulations

|-valign="top"
|[https://github.com/geoschem/geos-chem/pull/459 Updates to enable automated run directory creation]
|Liam Bindle (GCST)<br>Melissa Sulprizio (GCST)
|Run directory
|
* [https://github.com/geoschem/geos-chem/pull/459 geoschem/geos-chem PR #459]
* Zero-diff update

|-valign="top"
|[https://github.com/geoschem/geos-chem/issues/951 Bug fix: Use REAL*8 precision in for CH3O2 + OH reaction definition in fullchem.eqn]
|Bob Yantosca (GCST)
|Chemistry
|
* [https://github.com/geoschem/geos-chem/pull/961 geoschem/geos-chem #951]
* Zero-diff update

|-valign="top"
|[https://acp.copernicus.org/articles/21/1861/2021/ Updated Rn-222 emissions for TransportTracers simulations]
|Bo Zhang (NIA)
|Emissions
|
*[https://github.com/geoschem/HEMCO/issues/120 geoschem/HEMCO #120]
*Existing Rn emissions will remain as an option

|-valign="top"
!colspan="4" bgcolor="#CCFFFF"|Updates that will only affect GCHP

|-valign="top"
|[https://github.com/geoschem/geos-chem/pull/1008 Define a GCHP "Default" collection that will archive a small number of commonly-requested diagnostic fields]
|Liam Bindle (GCST)
|Diagnostics
|
*[https://github.com/geoschem/geos-chem/pull/1008 geoschem/geos-chem PR #1008]

|}

=== New data directories ===

The following data directories have been added or updated in this version.  You will have to [[Downloading_GEOS-Chem_data_directories|download the directories]] relevant to your simulation.

{| border=1 cellspacing=0 cellpadding=5
|-bgcolor="#CCCCCC"
!width="200px"|Inventory
!width="100px"|Type
!width="400px"|What was added?
!width="300px"|Directory

|-valign="top"
|[https://doi.org/10.5194/acp-21-1861-2021 ZHANG_Rn222]
|Optional
|Updated Rn222 emissions for TransportTracers simulations (cf [https://doi.org/10.5194/acp-21-1861-2021 Bo Zhang et al (2021)])
|[http://ftp.as.harvard.edu/gcgrid/data/ExtData/HEMCO/ZHANG_Rn222/v2021-11/README <tt>HEMCO/ZHANG_Rn222/v2021-11</tt>]

|}