GEOS-Chem model development priorities

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On this page we list the current priorities for GEOS-Chem development. This list was compiled by the user Working Groups at the last International GEOS-Chem Meeting (IGC7) in May 2015 and has been continuously updated since based on code readiness and input from the Working Groups and the Steering Committee.

We also invite you to view our GEOS-Chem Support Team project management board on Trello.com, which shows the current GCST workflow.

List of priorities as of Nov 2016

The items listed below are in different stages of readiness and will be included in future versions of the model.

Awaiting release

Items awaiting release will be part of the next version release of GEOS-Chem and are actively being incorporated into the standard model and benchmarked. More information on those items can be obtained on the GEOS-Chem v11-02 wiki page.

Item Author(s) Status
Science updates
Updating chemistry rate constants based on JPL Publication 15-10 Barron Henderson (U. Florida)
Mat Evans (U. York)
Oxidants and Chemistry WG
  • Will be included in v11-02a (pending approval)
PAN updates Emily Fischer (CSU)
  • Will be included in v11-02a (pending approval)
Monthly mean NEI2011 emissions GCST
Katie Travis (Harvard)
  • Will be included in v11-02a (pending approval)
Structural/programming updates
TBD
Documentation
TBD

--Melissa Sulprizio (talk) 20:08, 9 March 2017 (UTC)

Ready to go in

Slated for inclusion in v11-02

The following items were prioritized for inclusion in GEOS-Chem v11-02.

Item Author(s) Type Status
Chemistry updates
Halogen chemistry updates Tomás Sherwen (York)
Johan Schmidt (Harvard)
Oxidants and Chemistry WG
Science
Enhance default GEOS-Chem simple SOA Aerosol Working Group Chairs Science
Updates to isoprene chemistry, includes:
  • Fast photolysis of carbonyl nitrates
  • Aerosol uptake of organic nitrates
  • Nighttime isoprene chemistry
Jenny Fisher (U. Wollongong)
Eloïse Marais (Harvard)
Katie Travis (Harvard)
Kelvin Bates (Caltech)
Rebecca Schwantes(Caltech)
Science
  • Delivered to GCST (Mar 2017)
  • Slated for v11-02c
Add aqueous isoprene uptake to SOA scheme Eloise Marais (Harvard) Science
  • Delivered to GCST (Jul 2016)
  • Slated for v11-02c
Update density of BC to 1.8 and add absorption enhancement factor in input.geos Xuan Wang (MIT) Science
Monthly mean surface methane distributions Lee Murray (NASA GISS/LDEO) Science
Radon flux diagnostic GCST Benchmarking
Emission updates
EDGAR v4.3 emissions Chi Li (Dalhousie) Science
  • Delivered to GCST (Nov 2016)
EPA-derived BC/OA emissions over US (1990-2012) David Ridley (MIT) Science
Historical CAC emissions Chi Li (Dalhousie) Science
  • Delivered to GCST (Nov 2016)
Default US emissions to NEI after 2011 Dalhousie group Science
Ammonia from Arctic birds Dalhousie group Science
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
  • Implemented in v9-01-01
  • Needs to be added as a HEMCO extension
Non-agricultural NH3 for use with MASAGE Amos Tai (CUHK) Science
Deposition/surface updates
Fix to direct/diffuse radiation Katie Travis (Harvard) Science
Species Database Phase 3:
  • Harmonizing Henry's Law coefficients across wet and dry deposition
GCST Science
Updated organic deposition Katie Travis (Harvard)
Jenny Fisher (U. Wollongong)
Science
Remove dependence of species drydep on HNO3 drydep Katie Travis (Harvard)
Jenny Fisher (U. Wollongong)
Science
Update SO2 scavenging in convective updrafts for consistency Duncan Fairlie (NASA/LARC) Science
Sedimentation of stratospheric aerosols Sebastian Eastham (Harvard) Science
Structural updates
Uniformity of units GCST Structural
  • Phase 2 (unit uniformity throughout chemistry) to be implemented after Flexchem
  • Phase 3 (unit uniformity in some specialty simulations) will be implemented in pieces with input from 3rd party developers
  • Phase 4 (removal of area and area-dependent State_Met variables) will be ongoing
NetCDF Output Phase 3a: Output diagnostics in NetCDF format GCST Structural
NetCDF Output Phase 3b: Updates to eliminate differences between single and multi-segmented GEOS-Chem runs GCST
Christoph Keller
Bug fix/Structural
Hg and POPs updates
PCB simulation Carey Friedman (MIT)
Helen Amos (Harvard)
Science
Hg code updates (chemistry, ocean, land) Hg and POPs Working Group Science
Surface ocean Hg boundary conditions from MITgcm Hannah Horowitz (Harvard) Science
Expansion of model capabilities
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
FlexGrid: Use HEMCO I/O and regridding capabilities to read and regrid met fields Jiawei Zhuang (Harvard)
Jintai Lin (PKU)
Structural
  • Delivered to GCST (Oct 2016)
Merge standard simulation with specialty simulations for OVOC, acids, aromatics, dicarbonyls, terpenes Dylan Millet (UMN)
Xin Chen (UMN)
Science
Nested CO2, CH4, Hg, TOMAS, adjoint, etc. Nested Model Working Group Science

--Melissa Sulprizio (talk) 16:13, 7 November 2016 (UTC)

Defer to v11-03 unless ready in time for v11-02

Item Author(s) Type Status
Global evaluation of using LWC and IWC from met fields for wet scavenging Hongyu Liu (NIA/NASA LARC)
Bo Zhang (NIA)
Science
Kz eddy mixing scheme Karen Yu (Harvard) Science
VBS SOA option Rokjin Park (SNU) Science
Benchmark of stratosphere simulation 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

--Melissa Sulprizio (talk) 16:13, 7 November 2016 (UTC)

Not prioritized for v11-02 (revisit at IGC8)

Item Author(s) Type Status
Python GEOS-Chem output processing and visualization package Benoît Bovy (U. Liège-Belgium) Software package
  • Users may download, test it, and submit feedback to Benoit Bovy.
Sea salt emission from sea ice Jiayue Huang (UW) Science
Re-evaluation of SST dependence of sea salt emissions Jiayue Huang (UW) Science
MOSAIC implementation Sebastian Eastham (Harvard) Science
Update MODIS LAI fields through 2015 Barron Henderson (UF) Science
Lightning NOx chemistry parameterization Alicia Gressent (MIT) Science

--Melissa Sulprizio (talk) 16:13, 7 November 2016 (UTC)

Over the horizon (6-12 months)

Item Author(s) Type Status
Dust emissions at nested-grid resolution Yuxuan Wang (Texas A&M)
Jun Wang (UNL)
Science
Archive meteorological fields with higher resolution (for RCPs) Lee Murray (NASA GISS/LDEO) Science
Land cover module in GEOS-Chem Jeffrey Geddes (MIT)
Michael Long (Harvard)
Science
Improved lightning emission scheme Lee Murray (NASA GISS/LDEO) Science
Archive high resolution wind fields for sea salt GEOS-Chem Support Team Science
Cl chemistry updates Lyatt Jaeglé (UW) Science
Automate redistribution of NOx in HEMCO Lee Murray (NASA GISS/LDEO) Science
Include Hg in full chemistry Noelle Selin (MIT) Science
DMS oxidation scheme updating Tom Breider (Harvard)
Becky Alexander (U. Washington)
Oxidants and Chemistry Working Group
Science
Historical Hg emissions (1850-present) Hannah Horowitz (Harvard) Science
  • Awaiting completion of David Street's revised 1850-present inventory
Joint CO/CO2/CH4 forward model simulation Nicholas Deutscher (U. Wollongong) Science
Past and future fire emissions under RCPs Loretta Mickley (Harvard)
Yuhang Wang (GIT)
Shiliang Wu (MT)
Science
  • Some regional (western US, Canada, and Alaska) inventories for the 2050s A1B scenario are available by request (Loretta Mickley).
  • Further work on global scale and other scenarios are underway.
Benchmark for 0.25x0.3125 nested NA model Jun Wang (UNL) Benchmarking
Emission scheme of dust: subgrid wind variation to remove resolution dependence and better interannual variability David Ridley (MIT) Science

--Melissa Sulprizio (talk) 16:13, 7 November 2016 (UTC)

Longer term (12-24 months)

Item Author(s) Type Status
Tagged sulfate and nitrate simulation, including Becky Alexander (UW) Science
  • These updates been implemented in v9-02, but have not been successfully merged with HEMCO in v10-01
  • Improvements for the tagged nitrate simulation are in the pipeline
CO2 dependence of stomata conductance in dry deposition Amos Tai (CUHK) Science
Ozone damage to vegetation Amos Tai (CUHK) Science
Bi-directional NH3 emissions Juliet Zhu (CSU)
Lin Zhang (PKU)
Science
Arsenic simulation Shiliang Wu (MT) Science
Dry deposition: Update the ozone dry deposition scheme Murphy group (UofT) Science
Country-based weekend/weekday variability for EDGAR v4.2 Lee Murray (NASA GISS/LDEO)
Christoph Keller (Harvard)
Science
Resolution-independent lightning NOx scaling Lee Murray (NASA GISS/LDEO) Science
Nested-grid model with GEOS-FP at 1/2° x 5/8° resolution Nested Model Working Group Structural
Update HCN simulation, implement in standard model via FlexChem Jenny Fisher (U. Wollongong) Science
  • Not a priority
TNO emissions over Europe (7km) Greece team Science
  • On hold indefinitely
Implement biogenic emissions of ethane, propane Zitely Tzompa (CSU) Science
  • On hold indefinitely
Subgrid scale precipitation variability Harvard group Science
  • On hold indefinitely

--Melissa Sulprizio (talk) 16:13, 7 November 2016 (UTC)