Issues

• Choosing a restart file for a 2018 spin-up in GEOS-Chem 14.8.0

  category: Questiontopic: Restart Files
  geoschem/geos-chem#3427 · Filter by author LiuZiyan767 opened on Nov 2, 2026
  2

• TOMAS bug/issue with PH2SO4 in v14.8.0 KPP reactions with HOBr and HOCl

  category: Bug
  geoschem/geos-chem#3424 · Filter by author BettyCroft opened on Oct 29, 2026

• Improve error handling for missing GC-Classic restart file

  category: Feature Requesttopic: HEMCO Submoduletopic: Restart Files
  geoschem/geos-chem#3420 · Filter by author lizziel opened on Oct 27, 2026

• GRAV_SETTLING writes DryDepChm out of bounds in 14.0–14.6 when DryDepChm species are listed explicitly in HISTORY.rc — corrupts species concentrations and crashes KPP (fixed in 14.7.0 / PR #3118)

  category: Bug
  geoschem/geos-chem#3419 · Filter by author wangdc98 opened on Oct 26, 2026

• Computational bottleneck in DO_CONVECTION (Setting the large FSOL array to zero)

  category: Bugtopic: Convection and Mixingtopic: Performance
  Bug

  geoschem/geos-chem#3417 · Filter by author yantosca opened on Oct 22, 2026 · 14.8.1
  

• Request for GEOS-Chem 13.1.0 1-month benchmark data (Classic and GCHP)

  category: Questiontopic: Benchmarking and Testing
  geoschem/geos-chem#3414 · Filter by author Minshan6 opened on Oct 19, 2026
  3

  

• 2020-05-12 00:10 UTC GEOS-Chem ERROR: Error encountered in wet deposition! WETDEP: ERROR ... for species 14 in area WASHOUT: at surface WETLOSS = -5.7387069E-281 Species 14 has a negative value at 37 72 1 set to zero

  category: Bugtopic: Deposition
  geoschem/geos-chem#3413 · Filter by author Yuxl555 opened on Oct 18, 2026
  2

  

• 2°×2.5° global OH file (OH_3Dglobal.geos5.47L.2x25.nc) values are artificially diluted by a factor of 4

  category: Bugtopic: Carbon Gases Simulationstopic: Input Data
  geoschem/geos-chem#3411 · Filter by author kearn218 opened on Oct 15, 2026
  3

  

• vdiff inconsistency leading to stratospheric accumulation

  category: Bugtopic: Convection and Mixing
  geoschem/geos-chem#3408 · Filter by author fsolmon opened on Oct 13, 2026 · 14.9.0
  4

  

• Change the CO2 variable to standard computed CO2

  category: Questionhelp needed: Request Input From Communitytopic: Chemical Mechanisms
  geoschem/geos-chem#3407 · Filter by author efleming257 opened on Oct 9, 2026
  4

• Compute molecular hydrogen (H2) as an active constituent

  category: Questionhelp needed: Request Input From Communitytopic: Chemical Mechanisms
  geoschem/geos-chem#3406 · Filter by author efleming257 opened on Oct 9, 2026
  4

  

• Inccorect HMS oxidation in aerosol

  category: Bugtopic: Chemical Mechanisms
  geoschem/geos-chem#3405 · Filter by author ktravis213 opened on Oct 9, 2026 · 14.9.0
  6

  

• Erroneous sulfate production from in-cloud Fe/Mn-catalysed SO2 oxidation when the in-cloud liquid water content is near zero

  category: Bug
  geoschem/geos-chem#3401 · Filter by author yuanjianz opened on Oct 6, 2026

• Floating-point exception in GET_F (wetscav_mod.F90) for TOMAS simulations built with -DLUO_WETDEP=y

  category: Bughelp needed: Request Input From Communitynever staletopic: Aerosolstopic: Build
  Bug

  geoschem/geos-chem#3396 · Filter by author yantosca opened on Sep 30, 2026 · 14.9.0
  4

  

• Instructions on modifying pre-14.8.0 GEOS-Chem versions to avoid dummy species in chemical mechanisms from affecting integration results

  category: Discussiontopic: Chemical Mechanisms
  geoschem/geos-chem#3388 · Filter by author yantosca opened on Sep 14, 2026
  

• Question about GFED4 data availability for 2024–2025

  category: Questionhelp needed: Request Input From Communitytopic: Emissions
  geoschem/geos-chem#3380 · Filter by author sithu-gc opened on Aug 31, 2026
  1

• Add !$OMP COLLAPSE to OpenMP-parallelized loops to improve performance (GC-Classic only)

  category: Feature Requestno-diff-to-benchmarktopic: Performancetopic: Structural Modifications
  Feature

  geoschem/geos-chem#3377 · Filter by author yantosca opened on Aug 27, 2026 · 14.9.0
  1

  

• GNU compiler minimum requirements for 15.0

  category: Feature Requestnever staleTODO: Documentationtopic: User Environment
  geoschem/geos-chem#3355 · Filter by author lizziel opened on Jul 16, 2026 · 15.0.0
  2

• Unexpected pressure observations when initializing KPP Standalone

  category: Bugnever staletopic: Chemical Mechanisms
  geoschem/geos-chem#3337 · Filter by author jcoley11 opened on Jun 24, 2026
  1

  

• Cloud-J in Hg simulation

  category: Feature Requesthelp needed: Request Input From Communitynever staleno-diff-to-benchmarktopic: Hg or POPs simulationstopic: Photolysis
  geoschem/geos-chem#3329 · Filter by author lizziel opened on Jun 12, 2026
  3

• Required valid_range in ExtData2G.yaml for collection needing extrapolation

  category: Bugnever staletopic: GCHP Only
  geoschem/geos-chem#3279 · Filter by author yuanjianz opened on Apr 17, 2026
  7

  

• Rosenbrock step-size failures and excessive fall velocity in GEOSCHEM-CESM coupled model

  category: Bugnever staletopic: CESMtopic: Runtime Error
  geoschem/geos-chem#3278 · Filter by author andrewyao16 opened on Apr 17, 2026
  1

• Reduce requested time, memory, and CPU allocation in benchmark and integration test scripts

  category: Feature Requestno-diff-to-benchmarktopic: Benchmarking and Testingtopic: Structural Modifications
  Feature

  geoschem/geos-chem#3275 · Filter by author yantosca opened on Apr 15, 2026
  

• GEOS-Chem ReadTheDocs documentation updates

  TODO: Documentation
  Task

  geoschem/geos-chem#3269 · Filter by author yantosca opened on Apr 10, 2026
  3

  

• J-values outside the chemistry grid are set to zero

  category: Bugnever staletopic: Photolysis
  geoschem/geos-chem#3268 · Filter by author yantosca opened on Apr 9, 2026
  3