GEOS-Chem 12

---

---

GEOS-Chem v11-02-final will also carry the designation GEOS-Chem 12.0.0. We are migrating to a purely numeric versioning system in order to adhere more closely to software development best practices. For a complete description of the new versioning system, please see our GEOS-Chem version numbering system wiki page.

---

---

Version history

The table below shows the previous, current, and successive major releases of GEOS-Chem:

Previous major release	This version in development	Next major release
GEOS-Chem v11-02 (aka 12.0.0)	GEOS-Chem 12	GEOS-Chem 13
TBD	TBD	TBD
View v11-02 benchmark history	View GEOS-Chem 12 benchmark history	TBD

GEOS-Chem 12.3.0

The following items are slated to be included in GEOS-Chem 12.1.0. This is a feature release which will be benchmarked with a 1-month benchmark.

Feature	Submitted by	Type	Status
Features affecting the full-chemistry simulation:
Features NOT affecting the full-chemistry simulation:

GEOS-Chem 12.2.0

The following items are slated to be included in GEOS-Chem 12.1.0. This is a feature release which will be benchmarked with a 1-month benchmark and 1-year Rn-Pb-Be benchmark.

Feature	Submitted by	Type	Status
Features NOT affecting the full-chemistry simulation:

GEOS-Chem 12.1.0

The following items are slated to be included in GEOS-Chem 12.1.0. This is a feature release which will be validated with a 1-month benchmark.

Feature	Submitted by	Type	Status
Features affecting the full-chemistry simulation:
FlexGrid: Use HEMCO to read met fields and enable nested simulations over any custom domains	Jiawei Zhuang (Harvard) Jintai Lin (PKU)	Structural	NOTE: FlexGrid might result in slight differences in met fields w/r/t the current regridding method. This could have an impact on the full-chemistry simulations.
Anthropogenic PM2.5 dust source	Sajeev Philip (Dalhousie)	Science	Need to fix an under-the-hood issue in HEMCO that makes this update yield 1200 Tg of dust.
NetCDF Output Phase 3b: Updates to eliminate differences between single and multi-segmented GEOS-Chem runs	GCST Christoph Keller	Bug fix/Structural
Features NOT affecting the full-chemistry simulation:
Updated flux diagnostics	Chris Holmes (Florida State) GCST	Structural/ Benchmarking

GEOS-Chem 12.0.0

In order to transition to a new, purely numeric versioning system, the GEOS-Chem v11-02-final release also carries the designation GEOS-Chem v12.0.0.

For a complete description of the new versioning system, please see our GEOS-Chem version numbering system wiki page.

--Bob Yantosca (talk) 15:35, 20 June 2018 (UTC)

In the pipeline

The table below lists features that will eventually be added into GEOS-Chem. Please also see our GEOS-Chem model development priorities page.

Feature	Submitted by	Type	Status
Bug fixes (to be implemented ASAP)
FlexChem bug fix: do not zero ACTA, EOH, HCOOH	Katie Travis (MIT) Mike Long Sebastian Eastham (MIT)	Bug Fix	This can go into v11-03 right away.
Avoid double counting CEDS and GEIA NH3 biofuel emissions	Eloise Marais (Birmingham)	Bug Fix	The fix involves a simple change to the HEMCO_Config.rc file. This can go into v11-03 right away.
Fix double counting of CO2 emissions in CO2 simulations	Beata Bukosa (UW)	Bug fix	Awaiting code from developer
Transport updates
GEOS resolution & subgrid convection	Karen Yu (Harvard)	Science	Delivered to GCST (Oct 2017)
Chemistry updates
Heterogeneous uptake of NOx species by cloud droplets	Chris Holmes (FSU)	Science
Updated chlorine chemistry	Xuan Wang (Harvard)	Science
Add ND49 timeseries diagnostic for correcting ozone from the height of the lowest model level to 10m	Katie Travis (MIT)	Structural	Waiting on publication of a paper
Emissions updates
EPA NEI2011 Version EK	Zitely Tzompa-Sosa (CSU) Emily Fischer (CSU)	Science	We need more time to do a proper validation of this inventory.
FINNv1.6 biomass burning emissions for 2014-2016	Barron Henderson (US EPA)	Science	Waiting on corrected files to be given to us. See this link for more info.
MEIC emissions over China (2000-2015)	Lu Shen (Harvard) Melissa Sulprizio (Harvard)	Science	Postponed until the MEIC paper is published.
Grid-independent emissions, including: Lightning NOx emissions (3-hourly) Dust emissions (hourly) Biogenic and sea salt emissions (hourly)	Randall Martin (Dalhousie) Lee Murray (Rochester) David Ridley (MIT) Jintai Lin (PKU)	Science	Mostly ready; need to download data from developers
EPA-derived BC/OA emissions over US (1990-2012)	David Ridley (MIT) Chi Li (Dalhousie)	Science	Need to coordinate between Ridley and Li versions
Ocean ammonia emission inventory	Fabien Paulot (NOAA/GFDL)	Science	Data files delivered to GCST (Jan 2016) Needs to be implemented via HEMCO
A snow NOx source from deep snowpack	Maria Zatko (UW) Becky Alexander (UW)	Science	Delivered to GCST (Nov 2017) Implemented in v9-01-01 Needs to be added as a HEMCO extension
MASAGE inventory in HEMCO as default	Fabien Paulot (NOAA/GFDL) Amos Tai (CUHK)	Science
Non-agricultural NH3 for use with MASAGE	Amos Tai (CUHK)	Science
Radon emission update	Bo Zhang (NIA/NASA Langley)	Science	Delivered to GCST (Nov 2017) Implementation pending paper submission
GFAS biomass burning emissions	Mat Evans (York)	Science
Deposition/surface updates
Wet scavenging in mixed-phase clouds	Bo Zhang (NIA/NASA Langley)	Science	Delivered to GCST (Nov 2017) Only applied/tested for Pb Implementation pending paper submission
Harmonizing Henry's Law coefficients across wet and dry deposition	GCST	Science
Sedimentation of stratospheric aerosols	Sebastian Eastham (Harvard)	Science
Aerosol updates
Sea salt aerosol alkalinity	Qianjie Chen (UW) Becky Alexander (UW) Xuan Wang (Harvard)	Science	UW version delivered to GCST (Nov 2017)
VBS SOA option	Rokjin Park (SNU)	Science
Specialty simulation updates
Oxidant fields from v10 for 2006-2012 3D chemical source for CO2, CO OH for tagged CO & CH4	Dylan Jones (UofT)	Science	Will make data files available on ftp site
Year 2010 ocean Hg boundary conditions from ocean model	Hannah Horowitz (Harvard)	Science
Historical products emissions from Zhang et al. (2016), should become default	Colin Thackray (Harvard)	Science
AMAP/UNEP 2035 for Hg simulation	Helene Angot (MIT)	Science
Africa nested-grid for GEOS-FP and MERRA-2	Eloise Marais (U. Birmingham)	Science	Delivered to GCST (Dec 2017)
West Africa nested-grid for GEOS-FP	Mat Evans (York) Eleanor Morris (York)	Science
Tagged sulfate simulation	Becky Alexander (UW)	Science
Arsenic simulation	Shiliang Wu (MT)	Science
Structural updates
Additional modifications for FlexChem, including: Rebuild the pre-built chemistry mechanisms (Standard, Tropchem, UCX, SOA, SOA-SVPOA) with Kppa Add capability for custom chemistry mechanism by building KPP on-the-fly in GEOS-Chem	Mike Long (Harvard) GCST	Structural
Benchmark of stratospheric simulationuc	Dylan Jones (U. Toronto)	Benchmarking	1-yr benchmarks for GEOS-Chem v11-01d and later include comparisons with OSIRIS O3 Waiting on OSIRIS NO2 data Waiting on comparisons with ACE-FTS data
Add total column O3 to benchmarks	Chris Holmes (FSU) GCST	Benchmarking
Uniformity of units	GCST	Structural
ObsPack diagnostic as netCDF replacement for planeflight_mod.F	Andy Jacobson (NOAA/ESRL)	Structural	Delivered to GCST (May 2017)
Expansion of model capabilities
Archival of roughness length for temperature z0T	GCST	Met processing

New data directories

The following HEMCO data directories have been added or updated for GEOS-Chem v11-02. You will have to download the directories relevant to your simulation.

Inventory	What was added?	When added?	Directory

Validation

In this section we provide information about the benchmarks and tests that we have done to validate GEOS-Chem v11-03.

1-month and 1-year benchmarks

For complete information about the benchmark simulations used to validate GEOS-Chem v11-03, please see our GEOS-Chem v11-03 benchmark history wiki page.

Unit tests for GEOS-Chem v11-03

We perform a full set of unit tests on GEOS-Chem on an almost daily basis. These tests ensure that each new feature being added does not break any existing functionality.

Here are the unit tests that we ran before submitting 1-month benchmark simulation for v11-03. Click on the links below to see the results from each set of unit tests:

Unit test	Date

Previous issues now resolved in GEOS-Chem 12

The following bugs and/or technical issues have been resolved in v11-03.

Outstanding issues not yet resolved in GEOS-Chem 12

The following known issues are slated to be fixed in v11-03:

FlexChem bug fix: do not zero ACTA, EOH, HCOOH

This fix will be included in GEOS-Chem 12.

Katie Travis wrote:

I am working on a VOC simulation, and noticed that in my copy of v11-02f, the following species are set to zero in two places:

     ! Zero certain species
     C(ind_ACTA) = 0.e0_dp
     C(ind_EOH) = 0.e0_dp
     C(ind_HCOOH) = 0.e0_dp

And

  C(ind_ACTA)  = 0.0_dp
  C(ind_HCOOH) = 0.0_dp

Since none of these species are fixed in Tropchem.eqn, shouldn’t they NOT be set to zero?

Mike Long wrote:'

I think the code should be removed. This must have been a patch added to maintain parity with SMVGEAR w/o anticipating that the species would become active.

--Bob Yantosca (talk) 16:19, 17 May 2018 (UTC)

Avoid double counting CEDS and GEIA NH3 biofuel emissions

This fix will be included GEOS-Chem 12.

Eloise Marais wrote:

If CEDS includes NH3 emissions, then this will be double counting. I recommend using CEDS, as GEIA is very out of date (1998 according to the HEMCO configuration file I have).

Daniel Jacob replied:

We should use the GEIA NH3 natural emission inventory (1° x 1° file from Eleanor Morris) but not the GEIA NH3 biofuel inventory.

--Bob Yantosca (talk) 16:33, 17 May 2018 (UTC)