GEOS-Chem model development priorities

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 (IGC5) in May 2011 and has been continuously updated since based on code readiness and input from the Working Groups and the Steering Committee.

List of priorities as of May 2012

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

Awaiting release

Item	Author(s)	Status
Improved acetone simulation	Emily Fischer (Harvard)	Approved 14 Dec 2011 (v9-01-03b); awaiting release
Complete shift of biogenic VOC emissions from GEIA to MEGAN; retire GEIA	Dylan Millet (U. Minnesota)	Approved 14 Dec 2011 (v9-01-03b); awaiting release
OVOC's dry deposition	Jingqiu Mao (NOAA/GFDL)	Approved 19 Dec 2011 (v9-01-03c); awaiting release
Improved sea salt emission & deposition	Lyatt Jaeglé (U. Washington)	Approved 12 Jan 2012 (v9-01-03d); awaiting release
Dust submicron size distribution for optics	David Ridley (Colo. State)	Approved 12 Jan 2012 (v9-01-03d); awaiting release
Improved snow scavenging and washout parameterization	Qiaoqiao Wang (Harvard)	Approved 02 Feb 2012 (v9-01-03e); awaiting release
PARANOX ship plume emissions	Geert Vinken (Eindhoven)	Approved 17 Feb 2012 (v9-01-03f); awaiting release
Hg(II) gas-aerosol partitioning	Helen Amos (Harvard)	Approved 09 Mar 2012 (v9-01-03h); awaiting release
Nested-grid CO2 simulation	Yuxuan Wang (Tsinghua U.)	Approved 09 Mar 2012 (v9-01-03h); awaiting release
Historical emission inventories of SO2, NOx, BC, and POA	Eric Leibensperger (MIT)	Approved 09 Mar 2012 (v9-01-03h); awaiting release
Replace RETRO C2H6 emissions with emissions from the offline C2H6 simulation	Yaping Xiao (UNH)	Approved 26 Mar 2012 (v9-01-03i); awaiting release
Replace existing regridding routines with the MAP_A2A regridding package	Matt Cooper (Dalhousie)	Approved 27 Apr 2012 (v9-01-03k); awaiting release
Daily and 3-hourly GFED3 biomass emissions	Prasad Kasibhatla (Duke)	Delivered to GCST, slated for v9-01-03l
Tropospheric bromine chemistry	Justin Parrella (Harvard)	Delivered to GCST, slated for v9-01-03m
Stratospheric P and k (monthly climatological)	Lee Murray (Harvard)	Code is ready (awaiting delivery to GCST); slated for v9-01-03n

--Melissa Payer 13:02, 16 April 2012 (EDT)

Ready to go in

Item	Author(s)	Status
Expanded SOA	Havala Pye (EPA/ORD)	Delivered to GCST, awaiting implementation
Satellite-based NOx emission trends	Lok Lamsal (NASA GSFC)	Delivered to GCST, awaiting implementation
Inorganic chemistry updates	Mat Evans (Leeds)	Delivered to GCST, awaiting implementation
New soil NOx emission module	Rynda Hudman (UC Berkeley)	Bram Massakers (Eindhoven) is visiting Harvard for Summer 2012 in order to integrate the new soil NOx emissions into the standard GEOS-Chem code.
Methyl peroxy nitrate (MPN) chemistry	Ellie Browne (UC Berkeley)	Delivered to GCST, awaiting implementation
Acid uptake on dust aerosols	T. Duncan Fairlie (NASA/LARC)	Delivered to GCST, awaiting implementation
Cloudwater pH for sulfate formation	Becky Alexander (U. Washington)	Delivered to GCST, awaiting implementation
EPA/NEI2005 Hg emissions for US	Lyatt Jaeglé (U. Washington)	Delivered to GCST, awaiting implementation
Streets future Hg emissions	Bess Corbitt (Harvard)	Delivered to GCST, awaiting implementation
Nested-grid Hg simulation	Lyatt Jaeglé (U. Washington)	Delivered to GCST, awaiting implementation
Updated Hg(0) oxidation kinetics	Justin Parrella (Harvard)	Delivered to GCST, awaiting implementation
Capability to use GEOS-Chem Br/BrO fields in Hg simulation	Bess Corbitt (Harvard) Justin Parrella (Harvard)	Delivered to GCST, awaiting implementation
Tagged sulfate and nitrate simulation	Becky Alexander (U. Washington)	Code is ready
Update to EDGAR 4 anthropogenic emissions	Qiang Zhang (Tsinghua)	Code is ready
Improved HO2 uptake by aerosol	Jingqiu Mao (NASA/GFDL)	Code is ready
Fix RO2+HO2 rate constant	Fabien Paulot (Harvard)	globchem.dat is ready

--Melissa Payer 14:45, 14 March 2012 (EDT)

Almost there (< 6 months)

Item	Author(s)	Status
FAA/AEDT aircraft emissions inventory	Steven Barrett et al (MIT)	Code delivered to GCST, on hold
Longwave & shortwave RF codes for chemistry-climate	Fangqun Yu (SUNY Albany)
APM capability for nested grid	Fangqun Yu (SUNY Albany)
Interannual lightning	Lee Murray (Harvard)
Primary marine OA emissions	Kateryna Lapina (CSU)
Implement GISS advection scheme for GISS-driven applications	GEOS-Chem Support Team
Updated dicarbonyl simulation	May Fu (Peking U.)
Satellite diagnostic for XCO2	Liang Feng (U. Edinburgh)
Improve temporal resolution of anthropogenic CO2 sources	Ray Nassar (Environment Canada)
Improvements to isoprene chemistry, standardization of Paulot Scheme	Fabien Paulot (Harvard) Eloise Marais (Harvard) Jingqiu Mao (NASA/GFDL) Mat Evans (Leeds)
RO2+NO3 chemistry updates	Mat Evans (Leeds)
Inhibition of N2O5 hydrolysis by aerosol nitrate	Lin Zhang (Harvard)
Improved ROOH formation and chemistry	Fabien Paulot (Harvard) Mat Evans (Leeds)
Unified emissions pre-processor	Qiang Zhang (Tsinghua)
Update Asian emissions	Qiang Zhang (Tsinghua)

--Melissa Payer 10:45, 5 December 2011 (EST)

Over the horizon (6-12 months)

Item	Author(s)	Status
Working with GEOS-5.7.2	GEOS-Chem Support Team	Initial changes already added into v9-01-03; validation is ongoing
Nested-grid model at 0.25° x 0.3125° resolution	Yuxuan Wang (Tsinghua)	Development is ongoing
High-resolution emissions for above nested-grid model	Yuxuan Wang (Tsinghua)	Development is ongoing
Improved operator splitting	Mauricio Santillana (Harvard)	Development is ongoing
Update HCN simulation	Qian Li (U. Edinburgh) Dylan Jones (U. Toronto)
Improved planeflight diagnostic	Mat Evans (Leeds)
Chemistry diagnostics	Mat Evans (Leeds)
3-D VOC source for tagged CO simulations	Dylan Jones (U. Toronto)
Move to 2° x 2.5° versions of GISS GCM ModelE and Model3	Loretta Mickley (Harvard)	For more information, please see the GISS Model E Memo by (Lee Murray and Loretta Mickley).
Implement IPCC AR5 scenarios	Loretta Mickley (Harvard)
Improved dust simulation in nested-grid model	Rokjin Park (Seoul Nat'l Univ.)
Improve ocean CO2 flux	Ray Nassar (Environment Canada) Kevin Bowman (JPL)
CESM/CAM5 interface for chemistry-climate	Rokjin Park (Seoul Nat'l Univ.) Joshua Fu (U. Tennessee)
Standardize the two-film parameterization of air-sea exchange	Hg and POPs Working Group
Model engineering - improving KPP diagnostics	Mat Evans (Leeds) Barron Henderson (UNC) Mike Long (Harvard)

--Bob Y. 13:45, 17 May 2012 (EDT)

Longer term (> 12 months)

Item	Author(s)	Status
Grid-independent GEOS-Chem	GEOS-Chem Support Team	We plan on delivering the Chemistry Component to NASA/GMAO by June 1, 2012, which marks the end of Year 1 of the project. Development of the Emissions Component will be ongoing throughout Year 2 of the project. Much of this work will be done by Christoph Keller (Harvard). Our goal is to completely replace GEOS-Chem's legacy emissions routines with a modern emissions package that can be easily interfaced to an external GCM.
Improved atmospheric-ocean-land coupling of Hg simulation	Hg and POPs Working Group
Primary biological aerosol particles (PBAP's)	Colette Heald (Colo. State)	Only to be implemented if users identified
Unified radiative forcing module for GEOS-Chem	Aerosols Working Group	Under discussion/investigation
Effective meteorolgical fields for dust and sea-salt emissions	GEOS-Chem Support Team
Dust simulation expansion; tagged simulation, oxalate, Fe, P	Matthew Johnson (NCSU)
Benchmark for aerosol deposition	Colette Heald (Colo. State)	TBD
Read emission data at native resolution and regrid on the fly	GEOS-Chem Support Team	This has more or less been achieved with the addition the following packages: MAP-A2A regridding algorithm (v9-01-03k) New Olson land map module (v9-01-03i) New MODIS LAI module (v9-01-03j)
Link column version of GEOS-Chem with GEOS-GCM for chemistry-climate	GEOS-Chem Support Team	NOTE: This project has been folded into the Grid-independent GEOS-Chem project.
CO2 inhibition effect for isoprene emission	Loretta Mickley (Harvard)
Replace CASA CO2 biosphere climatology with year-specific fluxes	Ray Nassar (Environment Canada) Dylan Jones (U. Toronto)	TBD

--Melissa Payer 15:17, 6 October 2011 (EDT)
--Bob Y. 10:01, 30 March 2012 (EDT)