Aerosols Working Group
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All users interested in the GEOS-Chem aerosol simulations are encouraged to subscribe to the aerosols email list (click on the link in the contact information section below).
Information on existing projects and future developments in aerosols will be posted here. We encourage user groups to keep their information up-to-date.
Contact information
| Aerosols Working Group Co-Chairs | Colette Heald, Jeff Pierce |
| Aerosols Working Group email list | geos-chem-aerosols@seas.harvard.edu |
| To subscribe to email list | Send email to geos-chem-aerosols-join@seas.harvard.edu |
| To unsubscribe from email list | Send email to geos-chem-aerosols-leave@seas.harvard.edu |
Current GEOS-Chem Aerosol Projects, alphabetized by institution (please add yours!)
| User Group | Description | Contact Person | Date Added |
|---|---|---|---|
| Beijing/SUNY | Representing GEOS-Chem in the AEROCOM intercomparisons | May Fu Fangqun Yu |
28 Jul 2010 |
| CU Boulder | Inverse modeling of inorganic PM2.5 precursors. Direct aerosol radiative forcing. | Daven Henze | 19 Apr 2009 |
| CMU | Development of aerosol microphysics. Represented aerosols include size-resolved aerosol numbers and multi-component mass species, including sulfate, sea-salt, OM, EC, and dust. Evaluation against field campaign, e.g. ACE-Asia. | Peter Adams Dan Westervelt |
23 Apr 2009 |
| Dalhousie | Optimal estimation satellite retrieval of aerosols | Aaron van Donkelaar | 26 Sep 2012 |
| Dalhousie | Global aerosol speciation | Sajeev Philip | 26 Sep 2012 |
| Dalhousie/Tsinghua | Historical trends in Asian PM2.5 and emissions | Guannan Geng | 26 Sep 2012 |
| Dalhousie | Simulation of the absorbing aerosol index | Melanie Hammer | 26 Sep 2012 |
| Dalhousie | Diurnal variation in North American aerosol | Andrew Morrow | 26 Sep 2012 |
| Dalhousie | Sensitivity of global PM2.5 to sources | Colin Lee | 26 Sep 2012 |
| Dalhousie | Aerosol microphysics simulation of AOD and PM2.5 | Arjya Sarkar | 26 Sep 2012 |
| Dalhousie | Aerosol scavenging, nuclear accident simulation (137-CS, 133-XE) | Betty Croft | 03 Jan 2013 |
| Dalhousie | Satellite-based estimates of Asian PM2.5 | Junwei Xu | 26 Sep 2012 |
| Dalhousie | Aerosol microphysics: effects of nucleation, emissions and SOA on aerosol size distribution | Jeff Pierce | 03 Jan 2011 |
| Dalhousie | Historical trends in global satellite-derived estimates of PM2.5 | Brian Boys | 27 Apr 2011 |
| Dalhousie | Historical (1980-) trends in aerosol speciation in North America | Nathaniel Egan-Pimblett | 27 Apr 2011 |
| Dalhousie | Assimilation of CALIOP vertical profiles | Colin Lee | 5 Dec 2013 |
| Dalhousie | Simulation of heavy metals in PM | Farhan Khan | 5 Dec 2013 |
| Harvard | Aerosol scavenging in continental outflow; intercontinental transport and dissipation of pollution plumes | Sungshik Kim | 13 Jul 2010 |
| MIT | PM2.5 concentrations and health impacts, including future emissions trends | Noelle Selin | 29 Jun 2010 |
| MIT | Examining long term trends of dust in the tropics | Dave Ridley | 10 April 2012 |
| MIT | Investigating sub-grid variability and scale invariance of dust emissions | Dave Ridley | 25 September 2012 |
| MIT | Integrating RRTMG in GEOS-Chem (LW and SW, gases and aerosols), evaluating aerosol forcing | Dave Ridley Colette Heald | 25 September 2012 |
| MIT | Investigating impact of black carbon aging and mixing on radiative forcing | Xuan Wang | 25 September 2012 |
| MIT | Investigating NHx system (GEOS-Chem compared to surface, CalNex and IASI observations) | Luke Schiferl | 20 May 2010 |
| MIT | Developing a scheme to describe the aging of organic aerosol | Qi Chen | 8 Apr 2013 |
| MIT | Impact of 2000-2050 changes in climate, vegetation and land use on aerosols | Amos Tai | 9 May 2013 |
| MIT/CU | Investigating transpacific transport of aerosol and gas-phase pollution. | Kateryna Lapina | 13 Apr 2009 |
| MIT/CSU | Investigating aerosols in the Southeastern US | Bonne Ford | 01 Feb 2012 |
| NASA LaRC | transpacific transport of dust and sulfate; composition of Asian upper tropopause aerosol layer (ATAL). | Duncan Fairlie | 10 Apr 2013 |
| NIA / LaRC | Radiative effects of aerosols vs. clouds | Hongyu Liu | 05 Feb 2010 |
| Peking University | Carbonaceous aerosols in China | May Fu | 01 Jul 2010 |
| Peking University | Biomass burning aerosols in South and East Asia | May Fu | 01 Jul 2010 |
| Peking University | Estimate of interdecadal variation in direct radiative effect of aerosols over global lands | Jintai Lin | 01 Nov 2010 |
| Peking University | Anthropogenic dust and impacts on global environment | Jintai Lin | 01 May 2011 |
| University of Athens-National Observatory of Athens (Greece) | Study of aerosols over Europe and Greece by coupling Geos-chem (v8-03-01) with Camx | Anna Protonotariou | 01 Jul 2010 |
| UNL | aerosol retrieval from satellite, aerosol direct and indirect effect. | Jun Wang | 22 Apr 2009 |
| University of L'Aquila | Participation in organic aerosol AEROCOM intercomparison (v8.02.02 of GEOS-Chem) | Gabriele Curci | 24 Jun 2009 |
| University of L'Aquila | Development of a post-processing tool for aerosol optical properties computations | Gabriele Curci | 20 Jan 2011 |
| UW | Investigating the chemistry of sulfate and nitrate aerosol formation utilizing observations and modeling of oxygen isotopes | Becky Alexander | 30 Jun 2010 |
| UW | Developing a new parameterization of sea-salt emissions and dry deposition | Lyatt Jaeglé | 01 Jul 2010 |
| UW | Transport of aerosols to the Arctic using CALIOP observations | Maurizio DiPierro | 01 Jul 2010 |
| UW | Long-range transport of aerosols from Asia and N. America | Yurong Luan | 01 Jul 2010 |
| SNU | Evaluation of regional aerosol simulations with the nested G-C over East Asia | Rokjin Park | 15 Sep 2009 |
| SNU | Implement the VBS method in GEOS-Chem for SOA | Rokjin Park Dusung Jo | 28 Sep 2012 |
| SNU | Siberian forest fire aerosols and climatic effects | Rokjin Park Seungeun Lee | 28 Sep 2012 |
| SUNY-Albany | Formation and evolution of particles in the troposphere | Fangqun Yu | 06 Mar 2010 |
We have added the following updates pertaining to aerosols to recent GEOS-Chem versions:
| Version | Released | Description | Contact |
|---|---|---|---|
| v9-01-03 | Sep 2012 | Dust submicron size distribution for optics | Dave Ridley, CSU |
| v9-01-03 | Sep 2012 | Modifications to sea salt emissions and dry deposition | Lyatt Jaegle and Becky Alexander, U Washington |
| v9-01-03 | Sep 2012 | Various updates to wet deposition to impact aerosol simulation, see Wet Deposition Further Updates | Qiaoqiao Wang, Harvard |
| v9-01-02 | Nov 2011 | Implementation of APM aerosol microphysics model | Fangqun Yu, SUNY Albany Gan Luo, SUNY Albany |
| v9-01-02 | Nov 2011 | Removing inconsistencies in aerosol diagnostics | Sungshik Patrick Kim, Harvard |
| v9-01-02 | Nov 2011 | Updated aerosol dry deposition velocities over snow and ice surfaces | Jenny Fisher, Harvard |
| v9-01-02 | Nov 2011 | Added seasonality to Streets NH3 emissions over Asia | Jenny Fisher, Harvard |
| v9-01-01 | Jun 2011 | FlexAOD post-processing tool for the community | Gabriele Curci, University of l'Aquila |
| v8-03-02 | Sep 2010 | Using GEOS-5 liquid water content (LWC) and cloud fraction fields directly (rather than a parameterization) for aqueous sulfate chemistry | Jenny Fisher, Harvard |
| v8-03-02 | Sep 2010 | Implementation of new Bond et al. BC/OC emissions
|
E. Leibensperger, Harvard |
| v8-03-01 | May 2010 | Updating of GEOS-Chem aerosol optics | Colette Heald, CSU |
| v8-03-01 | May 2010 | ISORROPIA II in GEOS-Chem, implemented along with new isoprene chemistry from Caltech | Havala Pye, (formerly Caltech, now EPA) |
| v8-03-01 | May 2010 | Recommendation to remove SOA condensation in inorganic aerosol from standard code | Colette Heald, CSU |
| v8-03-01 | May 2010 | Adding aromatic SOA to standard code, released with Caltech isoprene chemistry | Daven Henze, CU Boulder |
| v8-03-01 | May 2010 | Implementation of TOMAS aerosol microphysics model | Peter Adams, CMU |
| v8-02-04 | Feb 2010 | Implementation of new volcanic emissions of SO2 from AeroCom | Jenny Fisher, Harvard |
| v8-02-04 | Feb 2010 | Updates and fixes to sea salt routine | Lyatt Jaegle, UW Becky Alexander, UW |
--Bob Y. 15:48, 6 September 2012 (EDT)
On-going Aerosol Working Group Developments
We plan to add these aerosol-related updates to GEOS-Chem in the next few releases:
| Update | Authors | Planned release |
|---|---|---|
| Expansion of SOA option (SOA + nonvolatile POA) | Havala Pye (formerly Caltech, now EPA) | Implemented in v9-02, awaiting release |
| Integrating a radiative transfer model into GEOS-Chem | Colette Heald (MIT) David Ridley (MIT) Karen Cady-Pereira (AER) Matt Alvarado (AER) |
Delivered to GCST; slated for inclusion post-v9-02 |
| Simplified description of uptake of SO2, nitric acid and sulfuric acid on mineral dust | Duncan Fairlie, Langley | Delivered to GCST; slated for inclusion post-v9-02 |
--Bob Y. 15:49, 6 September 2012 (EDT)
Future Development Priorities
These topics were raised at the IGC5 as future updates & development priorities for GEOS-Chem (with additions from the community in recent months):
| Update | Authors | Priority |
|---|---|---|
| Integrating online radiative forcing calculations into GEOS-Chem | Colette Heald (MIT), David Ridley (MIT) | high |
| Addition of effective wind speed to met fields for consistent resolution dust/sea salt emissions | Jeff Pierc (Dalhousie), David Ridley (MIT) and GCST | medium |
| Addition of deposition observations to aerosol benchmark | Colette Heald (MIT) | low |
| dust simulation expansion (tagged simulation, oxalate, P, Fe chemistry) | Matthew Johnson (NC State) | low |
| DMS oxidation scheme updating | TBD | low |
| Investigation of how aerosol water is treated in PM comparisons (ISORROPIA vs. hygroscopic growth curves) | TBD | low |
| APM capability for nested grid | Fangqun Yu (SUNY Albany) | |
| TOMAS capability for nested grid | Jeff Pierce (Dalhousie) | |
| Cloudwater pH for sulfate formation | Becky Alexander (U Washington) | |
| Tagged sulfate and nitrate simulation | Becky Alexander (U. Washington) | |
| Improved dust simulation in nested-grid model | Rokjin Park (Seoul National University) |
|
--Colette Heald 12:39, 9 May 2011 (EDT)
--Bob Y. 14:14, 8 August 2011 (EDT)
Aerosol optical properties
Please visit our new aerosol optical properties wiki page for more information about:
- Description of GEOS-Chem aerosol optics
- Aerosol optical properties update for v8-03-01
- Aerosol optical properties at high spectral resolution
Here is a list of updates that were considered (2, 4 and 5 are included in the v8-03-01 update):
| Proposed Update (include information on old values if known) | Reference | Contact |
|---|---|---|
| Account for absorption in the 300-500 nm range by OC, which may be greater than presently treated. Currently we have OC ss albedo in this range being > 0.95, though it may be lower than 0.85. | Barnard et al, 2008 | Daven Henze |
| Expand Mie table to include more wavelengths. Most literature values compare at 500 or 550 nm. Current GC lookup table includes 400, then 600. A wider range is also necessary for integrating to get total SW flux; something greater than 1500 perhaps? | Martin et al, 2004 | Daven Henze |
| Consider using the water content of the fine mode aerosol calculated in the aerosol thermodynamic module rather than hygroscopic growth curves to estimate wet particle effective radius. | N/A | Daven Henze |
| Consider changing the "default" AOD diagnostic wavelength from 400 nm to 550nm (for matching with MODIS & CALIPSO) | N/A | Colette Heald |
| Treat the radius of hydrophylic organic aerosol similar to that of sulfate. This is based on observations that organic aerosol and sulfate are often internally mixed. Should we consider something similar for black carbon? | Rupkheti et al., 2007 | Randall Martin |
Related Topics
- Aerosol emissions
- Aerosol microphysics simulations:
- Aerosol-only simulation
- Aerosol thermodynamical equilibrium
- Carbonaceous aerosols
- Mineral dust aerosols
- Secondary organic aerosols
- Sea salt aerosols
- Sulfate aerosols
- ISORROPIA II
- Photolysis mechanism in GEOS-Chem