GEOS-Chem model development priorities

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Revision as of 16:31, 20 October 2016 by Melissa Payer (Talk | contribs) (List of priorities as of Oct 2016)

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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 Oct 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 v11-01 wiki page.

Ready to go in

Item Author(s) Status
Halogen chemistry updates Tomás Sherwen (York)
Johan Schmidt (Harvard)
Oxidants and Chemistry WG
Updating chemistry rate constants based on JPL Publication 15-10 Barron Henderson (U. Florida)
Mat Evans (U. York)
Oxidants and Chemistry WG
PAN updates Emily Fischer (CSU)
  • Delivered to GCST (May 2013)
Monthly mean surface methane distributions Lee Murray (NASA GISS/LDEO)
Ocean ammonia emission inventory Fabien Paulot (NOAA/GFDL)
  • Data files delivered to GCST (Jan 2016)
  • Needs to be implemented via HEMCO
Update density of BC to 1.8 and add absorption enhancement factor in input.geos Xuan Wang (MIT)
  • Delivered to GCST (Jan 2016)
Lightning NOx chemistry parameterization Alicia Gressent (MIT)
Update OH + NO2 rate Barron Henderson (UF)
Fix to direct/diffuse radiation Katie Travis (Harvard)
Fix for NO3 + ISOP product Katie Travis (Harvard)
Lightning update based on Travis et al. (submitted) and Zhang et al. (2014, ACP) Katie Travis (Harvard)
Updated organic deposition Katie Travis (Harvard)
Jenny Fisher (U. Wollongong)
Remove dependence of species drydep on HNO3 drydep Katie Travis (Harvard)
Jenny Fisher (U. Wollongong)
Add aqueous isoprene uptake to SOA scheme Eloise Marais (Harvard)
  • Delivered to GCST (Jul 2016)
Enhance default GEOS-Chem simple SOA Aerosol Working Group Chairs
A snow NOx source from deep snowpack Maria Zatko (UW)
Becky Alexander (UW)
FlexGrid: Use HEMCO I/O and regridding capabilities to read and regrid met fields Jiawei Zhuang (Harvard)
Jintai Lin (PKU)
  • Delivered to GCST (Oct 2016)
PCB simulation Carey Friedman (MIT)
Helen Amos (Harvard)

--Melissa Sulprizio (talk) 16:23, 20 October 2016 (UTC)

Almost there (< 6 months)

Item Author(s) Status
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
NetCDF Output Phase 3a: Output diagnostics in NetCDF format GCST
NetCDF Output Phase 3b: Updates to eliminate differences between single and multi-segmented GEOS-Chem runs GCST, Christoph Keller
Species Database Phase 3:
  • Harmonizing Henry's Law coefficients across wet and dry deposition
GCST
Uniformity of units Lizzie Lundgren (GCST)
  • 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
Temporary fix to remove SO2 scavenging in convective updrafts Duncan Fairlie (NASA/LARC)
  • Delivered to GCST (Nov 2015)
  • Duncan Fairlie wrote on 03 Mar 2016:
I don't think my fix for this issue is ready for prime time. I get chimneys of essentially unscavenged SO2 extending into the UTLS during Asian monsoon, leading to too much sulfate aloft. I think replacing the instantaneous titration of H2O2 in the standard code with the correct oxidation of SO2 by H2O2 (and O3?) is necessary.
Update SO2 scavenging in convective updrafts for consistency Duncan Fairlie (NASA/LARC)
  • Still needs to be fully validated
Update MODIS LAI fields through 2015 Barron Henderson (UF)
Python GEOS-Chem output processing and visualization package Benoît Bovy (U. Liège-Belgium)
  • Users may download, test it, and submit feedback to Benoit Bovy.
Benchmark of stratosphere simulation Dylan Jones (U. Toronto)
  • 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
Benchmark for nested NA model Jun Wang (UNL)
High-resolution regional emissions (to be implemented via HEMCO) Lin Zhang (PKU)
Yuxuan Wang (Texas A&M)
Updates to isoprene chemistry, includes:
  • Fast photolysis of carbonyl nitrates
  • Aerosol uptake of organic nitrates
Jenny Fisher (U. Wollongong)
Eloïse Marais (Harvard)
Kelvin Bates (Caltech)
Katie Travis (Harvard)
  • This has already been added to the SEAC4RS research version of GEOS-Chem
3D chemical source for CO2 and CO; OH for tagged CO and CH4 simulations Dylan Jones (U. Toronto)
Hg code updates (chemistry, ocean, land) Hg and POPs Working Group
Nested CO2, CH4, Hg, TOMAS, adjoint, etc. Nested Model Working Group
Updated nighttime isoprene chemistry Rebecca Schwantes (Caltech)
EPA-derived BC/OA emissions over US (1990-2012) David Ridley (MIT)
Updated documentation on setting up new nested domains Lin Zhang (PKU)
Yuxuan Wang (Texas A&M)
Nested model publication wiki page Jun Wang (UNL)
Past and future fire emissions under RCPs Loretta Mickley (Harvard)
Yuhang Wang (GIT)
Shiliang Wu (MT)
Surface ocean Hg boundary conditions from MITgcm Hannah Horowitz (Harvard)
  • Paper is being prepared for submission
Kz eddy mixing scheme Karen Yu (Harvard)
Global evaluation of using LWC and ICW from met fields for wet scavenging Hongyu Liu (NIA/NASA LARC)
Bo Zhang (NIA)
MOSAIC implementation Sebastian Eastham (Harvard)
Sedimentation of stratospheric aerosols Sebastian Eastham (Harvard)

--Melissa Sulprizio (talk) 16:23, 20 October 2016 (UTC)

Over the horizon (6-12 months)

Item Author(s) Status
Dust emissions at nested-grid resolution Yuxuan Wang (Texas A&M)
Jun Wang (UNL)
Archive meteorological fields with higher resolution (for RCPs) Lee Murray (NASA GISS/LDEO)
Land cover module in GEOS-Chem Jeffrey Geddes (MIT)
Michael Long (Harvard)
Improved lightning emission scheme Lee Murray (NASA GISS/LDEO)
Archive high resolution wind fields for sea salt GEOS-Chem Support Team
VBS SOA option Rokjin Park (SNU)
Merge standard simulation with specialty simulations for OVOC, acids, aromatics, dicarbonyls, terpenes Dylan Millet (UMN)
Xin Chen (UMN)
Cl chemistry updates Lyatt Jaeglé (UW)
Automate redistribution of NOx in HEMCO Lee Murray (NASA GISS/LDEO)
Injection height for fire emissions Emily Fischer (CSU)
Include Hg in full chemistry Noelle Selin (MIT)
DMS oxidation scheme updating Tom Breider (Harvard)
Becky Alexander (U. Washington)
Oxidants and Chemistry Working Group
Historical Hg emissions (1850-present) Hannah Horowitz (Harvard)
  • Awaiting completion of David Street's revised 1850-present inventory
Joint CO/CO2/CH4 forward model simulation Nicholas Deutscher (U. Wollongong)

--Melissa Sulprizio (talk) 16:23, 20 October 2016 (UTC)

Longer term (12-24 months)

Item Author(s) Status
Tagged sulfate and nitrate simulation, including Becky Alexander (UW)
  • 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)
Ozone damage to vegetation Amos Tai (CUHK)
Bi-directional NH3 emissions Juliet Zhu (CSU)
Lin Zhang (PKU)
Arsenic simulation Shiliang Wu (MT)
Emission scheme of dust: subgrid wind variation to remove resolution dependence and better interannual variability David Ridley (MIT)
Subgrid scale precipitation variability Harvard group
Dry deposition: Update the ozone dry deposition scheme Murphy group (UofT)
Country-based weekend/weekday variability for EDGAR v4.2 Lee Murray (NASA GISS/LDEO)
Christoph Keller (Harvard)
Sea salt emission from sea ice Jiayue Huang (UW)
Resolution-independent lightning NOx scaling Lee Murray (NASA GISS/LDEO)
Nested-grid model with GEOS-FP at 1/2° x 5/8° resolution Nested Model Working Group
Re-evaluation of SST dependence of sea salt emissions Jiayue Huang (UW)
Update HCN simulation, implement in standard model via FlexChem Jenny Fisher (U. Wollongong)
  • Not a priority
TNO emissions over Europe (7km) Greece team
  • On hold indefinitely
Implement biogenic emissions of ethane, propane Zitely Tzompa (CSU)
  • On hold indefinitely

--Melissa Sulprizio (talk) 16:23, 20 October 2016 (UTC)