GEOS-Chem 14.4.0

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GEOS-Chem Versions Page

This page includes information about GEOS-Chem 14.4.0. For a list of updates prioritized for future versions, please see our GEOS-Chem model development priorities page.

Version overview

This version is currently in development

Repository GitHub Milestone DOI
GCClassic 14.4.0 14.4.0 milestone for geoschem/GCClassic TBD
GCHP 14.4.0 14.4.0 milestone for geoschem/GCHP TBD
GEOS-Chem (science codebase) 14.4.0 14.4.0 milestone for geoschem/geos-chem TBD
HEMCO 3.9.0 3.9.0 milestone for geoschem/HEMCO TBD

What's new in this version

Updates that will affect full-chemistry benchmark simulations

Feature Contributor(s) Model scope Notes and references
UCX bug fixes : (1) Use proper 4th index for WERADIUS array; (2) Get density of black carbon from the species database Bob Yantosca (Harvard) Aerosols
Replace ISORROPIA II with HETP aerosol thermodynamics Lizzie Lundgren (Harvard)
Seb Eastham (ICL) 		Aerosols
Parameterized Effective Radius for SNA and OM aerosols Haihui Zhu (WashU) Aerosols
Use GCARR_ac rate-law function for full-chemistry reactions where the Arrhenius B parameter is zero Bob Yantosca (Harvard) Chemistry
Fix uptake coefficients on stratospheric aerosol Chris Holmes (FSU) Chemistry
Updated gravitational settling, dry mass-weighted mean diameters and hygroscopic growth in aerosol dry deposition Yanshun Li (WashU) Dry Deposition
Global continental chlorine (pCl and HCl) emissions Bingqing Zhang (Georgia Tech)
Pengfei Liu (Georgia Tech) 		Emissions
Add diel and day-of-week scale factors to global base emissions Dandan Zhang (WashU) Emissions
Updated 0.1x0.1 timezone file accounting for daylight savings Karn Vohra (UCL) Emissions
Update volcano emissions through 2023 Melissa Sulprizio (Harvard) Emissions
Update surface methane boundary condition using NOAA flask data Lee Murray (Rochester) Input data
Fix bug in usage of FRSNO met-field Lizzie Lundgren (Harvard) Met fields
Fix PBL level calculations Chris Holmes (FSU) PBL height
Only convert units for species that require it Bob Yantosca Unit Conversion

Updates that will NOT affect full-chemistry benchmark simulations

Feature Contributor(s) Model scope Notes and references
Remove hardcoded year range for met fields, restart, and BC files in HEMCO_Config.rc Melissa Sulprizio (Harvard) Bug fix
GCHP carbon simulation (and fixes for single-species carbon simulations) Melissa Sulprizio (Harvard)
Bob Yantosca (Harvard) 		Carbon simulation
Removing unused carbon simulation options Hannah Nesser (JPL) Carbon simulation
Add missing gas postmeter CH4 emissions for the GHGI express extension inventory Melissa Sulprizio (Harvard)
Bob Yantosca (Harvard) 		Carbon simulation
CH4 simulation
Bug fix for stretched grid restart attribute check Lizzie Lundgren (Harvard) GCHP
Updates for GEOS-Chem in GEOS Christoph Keller (GMAO)
Lizzie Lundgren (Harvard) 		GEOS
Replace stalebot with "stale" GitHub action Bob Yantosca (Harvard) GitHub
Allow up to 10 nested brackets in the HEMCO_Config.rc file Bob Yantosca (Harvard) HEMCO
Rename tags in geoschem_config.yml for nitrate aerosol photolysis as per GCSC suggestion Bob Yantosca (Harvard) Run directory
Remove remaining binary punch diagnostic code Bob Yantosca (Harvard) Structural

New data directories

The following data directories have been added or updated in this version. You will have to download the directories relevant to your simulation.

Inventory Simulations What was added? Directory
Updated lookup tables for aerosol optical properties Aerosol-only
Fullchem
Hg 		ExtData/CHEM_INPUTS/FAST_JX/v2024-05
ExtData/CHEM_INPUTS/FAST_JX/v2024-05-Hg
Updated mask files CH4
carbon
  • Canada, Mexico, and CONUS masks at 0.1° x 0.1° resolution. These replace the 0.01° x 0.01° resolution masks, which were causing an I/O bottleneck in GCHP.
 ExtData/HEMCO/MASKS/v2024-04
NOAA GMD CH4 surface boundary conditions Fullchem ExtData/HEMCO/NOAA_GMD/v2023-10
Georgia Tech chlorine emissions Fullchem ExtData/HEMCO/GT_Chlorine/v2024-05

1-month full-chemistry benchmarks

1-month benchmark setup

The following table describes the GEOS-Chem setup for both GEOS-Chem Classic and GCHP 1-month benchmark simulations.

Git tag(s):
Compared to previous benchmark: 14.3.1
Software environment:
  • gcc 10.2.0
  • OpenMPI 4.1.0
  • netcdf-fortran 4.5.3
  • CMake 3.17.3
  • ESMF 8.0.1
Model resolution:
  • GEOS-Chem Classic: 4° x 5°
  • GCHP: c24
Meteorology fields: MERRA-2
  • GEOS-Chem Classic: 4° x 5°
  • GCHP: 0.5° x 0.625°
Initial conditions: July 1, 2019
  • NOTE: GCHP c24 restart file regridded from GEOS-Chem Classic 4° x 5°
Benchmark month: July 2019
Chemistry setup: See fullchem.eqn
This version will impact:
(select all that apply with boldface)
  • Emissions
  • Photolysis
  • Chemistry
  • Dry Deposition
  • Wet Deposition
  • Advection
  • BL Mixing
  • Convection
  • Meteorology Fields
  • Other (please specify): Aerosol thermodynamics

1-month internal benchmarks

Each update that will introduce a significant change in the full-chemistry simulation is tagged with an alpha version in Git. For each of these alpha versions, the GCST runs an internal 1-month benchmark simulation to isolate the impact from that update.

For more details on the update(s) included in each alpha version and a link to benchmark results, see this Google sheet.

1-month benchmark assessment form

Performance GEOS-Chem Classic GCHP
Grid resolution: 4° x 5° C24
# CPUs, nodes: 62 CPUs
1 node (AWS) 		62 CPUs
1 nodes (AWS)
Wall time: 06:12 07:06
Memory 11.5 GB 42.1 GB
Global mean OH:
(% change from previous version) 		13.57862664898 x 105 molec/cm3
(-1.06%) 		13.57068350813 x 105 molec/cm3
(-1.18%)
Methyl chloroform lifetime:
(% change from previous version) 		4.524290 years
(0.64%) 		4.502573 years
(0.66%)
Methane lifetime:
(% change from previous version) 		7.627114 years
(0.59%) 		7.586405 years
(0.61%)
Details
Species, J-Values, and COLUMN AOD values that changed by 10% or more at the surface: GEOS-Chem Classic 14.4.0 vs 14.3.1 GCHP 14.4.0 vs 14.3.1
Species and J-Values that changed by 10% or more at 500 hPa: GEOS-Chem Classic 14.4.0 vs 14.3.1 GCHP 14.4.0 vs 14.3.1
Species and J-Values that changed by 10% or more in zonal mean: GEOS-Chem Classic 14.4.0 vs 14.3.1 GCHP 14.4.0 vs 14.3.1
Emissions that changed by 10% or more: GEOS-Chem Classic 14.4.0 vs 14.3.1 GCHP 14.4.0 vs 14.3.1
Overview
Below we summarize the notable changes caused by specific updates. See also the internal benchmark results which isolate impacts from specific updates.

1. Add diel and day-of-week scale factors to global base emissions

This introduces small increases in emissions for CEDS species, especially over Africa and SE asia; most species show % change < 0.6%. Mean OH increases by 0.1%. Ratio plots show variation between ~0.992 and 1.007, so the changes are very small.

2. Updated 0.1x0.1 timezone file accounting for daylight savings

Mean OH decreased by -0.02%; ISOP emissions increased by 0.1%, most anthro & ship emissions show change less than +/-0.01%. Biogenic emissions show increases of 1.2x over Russia (where emissions are already small) and lesser over S. America, in a striped pattern due to time zone alignments.

3. Updated surface methane boundary condition using NOAA flask data

Differences are small (<0.1%) for all species. Global mean OH changed by 0.022%.

4. UCX bug fixes : (1) Use proper 4th index for WERADIUS array; (2) Get density of black carbon from the species database

Changes are mainly limited to BCPI aerosol in the stratosphere (ratio varies from 0.93 to 1.06) Decreases are most pronounced in the winter pole/midlatitudes above 5hPa and increases at the winter pole between 90S and 60S and 40-10 hPa. Mean OH increases by 0.0009%

5. Update volcano emissions through 2023

SO2 volcanic degassing emissions change by -1% due to updating the inventory version. The impact on all species concentrations is small. Global mean OH decreases by -0.014%.

6. Fix uptake coefficients on stratospheric aerosol

Mean OH increases by 0.0015%. Most species show very small changes (0.99-1.01) observed in NO2, NO3, and VOC observed in most ratio plots, except for: (1) HNO2 concentrations increase over the S. Pole by up to 3X skyward of 40hPa; (2) MPAN concentrations decreased by ~0.75 at ~10hPa between south of the equator; (3) NO, NO3, NPHEN concentrations decreased by 50% at ~100hPa and the S. Pole.

7. Fix PBL level calculations

Mean OH decreased by -0.23%. NO, NO2, HNO3 ship emissions (via ParaNOx) show very small diffs ~ 0.2% or less. NOx concentrations show increases of up to 1.4X, especially over tropical oceans; there is also a slight decrease off the coast of W. Africa. Bry/BrOx show decreases in the tropical oceans. ISOP and related species show increases over S. America and Africa.

8. Updated gravitational settling, dry mass-weighted mean diameters and hygroscopic growth in aerosol dry deposition

Mean OH decreases by 0.27%. DST1 increases in the Sahel by p to ~0.3 ug/m3 while other dust species show 2-5% DST2, DST3, DST4 show sizeable decreases (-11 to and -40 ug/m3) over Morocco and Western Sahara but relatively small changes where concentrations are already low. Other aerosols (e.g. NIT, NH3, etc) show most pronounced increases in the boreal regions but relatively small in magnitude, along with a general increase worldwide. Coarse seasalt shows large decreases but the bromine & chlorine seasalt species show very small changes.

9. Replace ISORROPIA II with HETP aerosol thermodynamics

Mean OH decreased by 0.37%. Mostly small changes in aerosol species. Large decreases noted over the S. Pacific/Southern Ocean for SALCAL, with corresponding increases in SALACL. In general, course seasalt aerosols show decreases and fine seasalt aerosols show increases, perhaps reflecting a different partitioning in equilibrium between HETP/ISORROPIA. SALA, SALC, DST*, BC*, OC* species are not affected.

10. Parameterized Effective Radius for SNA and OM aerosols

Mean OH decreases by -0.261%. Changes to AOD_SO4 and AOD_OCPI are consistent with those observed in the plot Haihui posted in PR #1902. SO4 and OC aerosol optical depth decreases by 20% or more in boreal regions, sub-Saharan Africa, India, China, and Indonesia/Thailand/Malaysia.

11. Global continental chlorine (pCl and HCl) emissions

Concentrations of HCl increase over the continents as expected. Small increases can also be seen in other chlorine species. The global mass of ClNO2 increases the most by 20%. Global mean OH decreased by -0.023%.

1-month GEOS-Chem Classic version comparison (14.4.0 vs 14.3.1)

Below are links to plots and tables comparing 1-month simulations for GEOS-Chem Classic 14.4.0 (Dev) and GEOS-Chem Classic 14.3.1 (Ref).

Species Category Plots Additional Information
Level Map Zonal Mean Emissions
Oxidants

O3, CO, OH, NOx

sfc 500hPa full column stratosphere sfc
Aerosols

DST1, DST2, DST3, DST4, NH4, NIT, SO4, HMS, BCPI, BCPO, OCPI, OCPO, AERI, BrSALA, BrSALC, ISALA, ISALC, NITs, SALA, SALC, SO4s, Simple_SOA, Complex_SOA, pFe

sfc 500hPa full column stratosphere column total AOD
Bromine

Bry, BrOx, Br, Br2, BrCl, BrNO2, BrNO3, BrO, CH3Br, CH2Br2, CHBr3, HOBr, HBr

sfc 500hPa full column stratosphere column total
Chlorine

Cly, ClOx, Cl, ClO, Cl2, Cl2O2, ClOO, ClNO2, ClNO3, CCl4, CFCs, CH3Cl, CH2Cl2, CH3CCl3, CHCl3, HOCl, HCl, Halons, HCFCs, OClO

sfc 500hPa full column stratosphere --
Iodine

Iy, IxOy, I, I2, IBr, ICl, IO, IONO, IONO2, CH3I, CH2I2, CH2ICl, CH2IBr, HI, HOI, OIO

sfc 500hPa full column stratosphere column total
Nitrogen

NOy, NOx, HNO2, HNO3, HNO4, MPAN, NIT, NO, NO2, NO3, N2O5, MPN, PAN, PPN, N2O, NHx, NH3, NH4, MENO3, ETNO3, IPRNO3, NPRNO3, AONITA, ETHN, BZPAN, NPHEN

sfc 500hPa full column stratosphere column total
Primary Organics

EOH, MOH, ISOP, MTPA, MTPO, LIMO, ALK4, BENZ, CH4, C2H2, C2H4, C2H6, C3H8, PRPE, TOLU, XYLE

sfc 500hPa full column stratosphere column total
Secondary Organics

ACTA, ALD2, BALD, CH2O, HPALDs, MACR, IEPOX, ACET, HAC, MEK, MVK, ISOPN, GLYC, GLYX, HCOOH, MAP, PHEN, RCHO, ETHP, MP

sfc 500hPa full column stratosphere column total
Secondary Organic Aerosols

TSOA0, TSOA1, TSOA2, TSOA3, ASOA1, ASOA2, ASOA3, ASOAN, TSOG0, TSOG1, TSOG2, TSOG3, ASOG1, ASOG2, ASOG3, INDIOL, LVOCOA, SOAIE, SOAGX, SOAP, SOAS

sfc 500hPa full column stratosphere column total
Sulfur

SOx, DMS, HMS, OCS, SO2, SO4

sfc 500hPa full column stratosphere column total
ROy

H2O2, H, H2, H2O, HO2, O1D, OH, RO2

sfc 500hPa full column stratosphere --
J-values sfc 500hPa full column stratosphere -- --
 
Emissions by HEMCO category Total

Aircraft, Anthropogenic, Biomass Burning, Biogenic, Lightning, Natural, Ocean, Seabirds, Decaying Plants, Ship, Soil, Degassing Volcanoes, Erupting Volcanoes

Emission totals Tables by species

Tables by inventory

Global mass Entire atmosphere

Troposphere only

Metrics OH concentration, MCF lifetime, CH4 lifetime
Timing GCClassic 14.3.1 vs 14.4.0

1-month GCHP version comparison (14.4.0 vs 14.3.1)

Below are links to plots and tables comparing 1-month simulations for GCHP 14.4.0 (Dev) and GCHP 14.3.1 (Ref).

Species Category2 Plots Additional Information
Level Map Zonal Mean Emissions
Oxidants

O3, CO, OH, NOx

sfc 500hPa full column stratosphere column total
Aerosols

DST1, DST2, DST3, DST4, NH4, NIT, SO4, BCPI, BCPO, OCPI, OCPO, AERI, BrSALA, BrSALC, ISALA, ISALC, NITs, SALA, SALC, SO4s, Simple_SOA, Complex_SOA, pFe

sfc 500hPa full column stratosphere column total AOD
Bromine

Bry, BrOx, Br, Br2, BrCl, BrNO2, BrNO3, BrO, CH3Br, CH2Br2, CHBr3, HOBr, HBr

sfc 500hPa full column stratosphere column total
Chlorine

Cly, ClOx, Cl, ClO, Cl2, Cl2O2, ClOO, ClNO2, ClNO3, CCl4, CFCs, CH3Cl, CH2Cl2, CH3CCl3, CHCl3, HOCl, HCl, Halons, HCFCs, OClO

sfc 500hPa full column stratosphere --
Iodine

Iy, IxOy, I, I2, IBr, ICl, IO, IONO, IONO2, CH3I, CH2I2, CH2ICl, CH2IBr, HI, HOI, OIO

sfc 500hPa full column stratosphere column total
Nitrogen

NOy, NOx, HNO2, HNO3, HNO4, MPAN, NIT, NO, NO2, NO3, N2O5, MPN, PAN, PPN, N2O, NHx, NH3, NH4, MENO3, ETNO3, IPRNO3, NPRNO3

sfc 500hPa full column stratosphere column total
Primary Organics

EOH, MOH, ISOP, MTPA, MTPO, LIMO, ALK4, BENZ, CH4, C2H6, C3H8, PRPE, TOLU, XYLE

sfc 500hPa full column stratosphere column total
Secondary Organics

ACTA, ALD2, CH2O, HPALDs, MACR, IEPOX, ACET, HAC, MEK, MVK, ISOPN, GLYC, GLYX, HCOOH, MAP, RCHO, MP

sfc 500hPa full column stratosphere column total
Secondary Organic Aerosols

TSOA0, TSOA1, TSOA2, TSOA3, ASOA1, ASOA2, ASOA3, ASOAN, TSOG0, TSOG1, TSOG2, TSOG3, ASOG1, ASOG2, ASOG3, INDIOL, LVOCOA, SOAIE, SOAGX, SOAP, SOAS

sfc 500hPa full column stratosphere column total
Sulfur

SOx, DMS, HMS, OCS, SO2, SO4

sfc 500hPa full column stratosphere column total
ROy

H2O2, H, H2, H2O, HO2, O1D, OH, RO2

sfc 500hPa full column stratosphere --
J-values sfc 500hPa full column stratosphere -- --
 
Emissions by HEMCO category Total

Aircraft, Anthropogenic, Biomass Burning, Biogenic, Lightning, Natural, Ocean, Seabirds, Decaying Plants, Ship, Soil, Degassing Volcanoes, Erupting Volcanoes

Emission totals Tables by species

Tables by inventory

Global mass Entire atmosphere

Troposphere only

Metrics OH concentration, MCF lifetime, CH4 lifetime
Timing GCHP 14.3.1 vs 14.4.0

1-month GCHP vs GEOS-Chem Classic comparison

Below are links to plots and tables comparing 1-month simulations for GCHP 14.4.0 (Dev) and GEOS-Chem Classic 14.4.0 (Ref).

Species Category2 Plots Additional Information
Level Map Zonal Mean Emissions
Oxidants

O3, CO, OH, NOx

sfc 500hPa full column stratosphere column total
Aerosols

DST1, DST2, DST3, DST4, NH4, NIT, SO4, BCPI, BCPO, OCPI, OCPO, AERI, BrSALA, BrSALC, ISALA, ISALC, NITs, SALA, SALC, SO4s, Simple_SOA, Complex_SOA, pFe

sfc 500hPa full column stratosphere column total AOD
Bromine

Bry, BrOx, Br, Br2, BrCl, BrNO2, BrNO3, BrO, CH3Br, CH2Br2, CHBr3, HOBr, HBr

sfc 500hPa full column stratosphere column total
Chlorine

Cly, ClOx, Cl, ClO, Cl2, Cl2O2, ClOO, ClNO2, ClNO3, CCl4, CFCs, CH3Cl, CH2Cl2, CH3CCl3, CHCl3, HOCl, HCl, Halons, HCFCs, OClO

sfc 500hPa full column stratosphere --
Iodine

Iy, IxOy, I, I2, IBr, ICl, IO, IONO, IONO2, CH3I, CH2I2, CH2ICl, CH2IBr, HI, HOI, OIO

sfc 500hPa full column stratosphere column total
Nitrogen

NOy, NOx, HNO2, HNO3, HNO4, MPAN, NIT, NO, NO2, NO3, N2O5, MPN, PAN, PPN, N2O, NHx, NH3, NH4, MENO3, ETNO3, IPRNO3, NPRNO3

sfc 500hPa full column stratosphere column total
Primary Organics

EOH, MOH, ISOP, MTPA, MTPO, LIMO, ALK4, BENZ, CH4, C2H6, C3H8, PRPE, TOLU, XYLE

sfc 500hPa full column stratosphere column total
Secondary Organics

ACTA, ALD2, CH2O, HPALDs, MACR, IEPOX, ACET, HAC, MEK, MVK, ISOPN, GLYC, GLYX, HCOOH, MAP, RCHO, MP

sfc 500hPa full column stratosphere column total
Secondary Organic Aerosols

TSOA0, TSOA1, TSOA2, TSOA3, ASOA1, ASOA2, ASOA3, ASOAN, TSOG0, TSOG1, TSOG2, TSOG3, ASOG1, ASOG2, ASOG3, INDIOL, LVOCOA, SOAIE, SOAGX, SOAP, SOAS

sfc 500hPa full column stratosphere column total
Sulfur

SOx, DMS, HMS, OCS, SO2, SO4

sfc 500hPa full column stratosphere column total
ROy

H2O2, H, H2, H2O, HO2, O1D, OH, RO2

sfc 500hPa full column stratosphere --
J-values sfc 500hPa full column stratosphere -- --
 
Emissions by HEMCO category Total

Aircraft, Anthropogenic, Biomass Burning, Biogenic, Lightning, Natural, Ocean, Seabirds, Decaying Plants, Ship, Soil, Degassing Volcanoes, Erupting Volcanoes

Emission totals Tables by species

Tables by inventory

Global mass Entire atmosphere

Troposphere only

Metrics OH concentration, MCF lifetime, CH4 lifetime

1-month GCHP vs GEOS-Chem-Classic diff-of-diffs

Below are links to plots and tables comparing 1-month simulations for GCHP 14.4.0 - 14.3.1 (Dev) and GEOS-Chem Classic GCHP 14.4.0 - 14.3.1 (Ref).

Species Category2 Plots
Level Map Zonal Mean
Oxidants

O3, CO, OH, NOx

sfc 500hPa full column stratosphere
Aerosols

DST1, DST2, DST3, DST4, NH4, NIT, SO4, BCPI, BCPO, OCPI, OCPO, AERI, BrSALA, BrSALC, ISALA, ISALC, NITs, SALA, SALC, SO4s, Simple_SOA, Complex_SOA, pFe

sfc 500hPa full column stratosphere
Bromine

Bry, BrOx, Br, Br2, BrCl, BrNO2, BrNO3, BrO, CH3Br, CH2Br2, CHBr3, HOBr, HBr

sfc 500hPa full column stratosphere


Chlorine

Cly, ClOx, Cl, ClO, Cl2, Cl2O2, ClOO, ClNO2, ClNO3, CCl4, CFCs, CH3Cl, CH2Cl2, CH3CCl3, CHCl3, HOCl, HCl, Halons, HCFCs, OClO

sfc 500hPa full column stratosphere
Iodine

Iy, IxOy, I, I2, IBr, ICl, IO, IONO, IONO2, CH3I, CH2I2, CH2ICl, CH2IBr, HI, HOI, OIO

sfc 500hPa full column stratosphere


Nitrogen

NOy, NOx, HNO2, HNO3, HNO4, MPAN, NIT, NO, NO2, NO3, N2O5, MPN, PAN, PPN, N2O, NHx, NH3, NH4, MENO3, ETNO3, IPRNO3, NPRNO3

sfc 500hPa full column stratosphere
Primary Organics

EOH, MOH, ISOP, MTPA, MTPO, LIMO, ALK4, BENZ, CH4, C2H6, C3H8, PRPE, TOLU, XYLE

sfc 500hPa full column stratosphere
Secondary Organics

ACTA, ALD2, CH2O, HPALDs, MACR, IEPOX, ACET, HAC, MEK, MVK, ISOPN, GLYC, GLYX, HCOOH, MAP, RCHO, MP

sfc 500hPa full column stratosphere
Secondary Organic Aerosols

TSOA0, TSOA1, TSOA2, TSOA3, ASOA1, ASOA2, ASOA3, ASOAN, TSOG0, TSOG1, TSOG2, TSOG3, ASOG1, ASOG2, ASOG3, INDIOL, LVOCOA, SOAIE, SOAGX, SOAP, SOAS

sfc 500hPa full column stratosphere
Sulfur

SOx, DMS, OCS, SO2, SO4

sfc 500hPa full column stratosphere
ROy

H2O2, H, H2, H2O, HO2, O1D, OH, RO2

sfc 500hPa full column stratosphere
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