Aerosols Working Group

From Geos-chem
Revision as of 17:22, 27 April 2014 by Emarais (Talk | contribs) (Current GEOS-Chem Aerosol Projects, alphabetized by institution (please add yours!))

Jump to: navigation, search

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
To subscribe to email list Send email to
To unsubscribe from email list Send email to

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
Harvard Irreversible uptake of isoprene SOA; estimate of organic aerosol yields with satellite observations Eloise Marais 27 April 2014
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 Sep 2012
MIT Integrating RRTMG in GEOS-Chem (LW and SW, gases and aerosols), evaluating aerosol forcing Dave Ridley
Colette Heald
25 Sep 2012
MIT Investigating impact of black carbon aging and mixing on radiative forcing Xuan Wang 25 Sep 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

Recent GEOS-Chem updates related to aerosols

We have added the following updates pertaining to aerosols to recent GEOS-Chem versions:

Version Released Description Contact
v9-02 Mar 2014 Expansion of SOA option (SOA + nonvolatile POA) Havala Pye (formerly Caltech, now EPA)
v9-02 Mar 2014 Cloud water pH for sulfate formation Becky Alexander (U. Washington)
v9-02 Mar 2014 Better representation of OC growth with RH and correction to sulfate optics David Ridley (MIT)
Randall Martin (Dalhousie)
v9-02 Mar 2014 Bug fix in jv_spec_aod.dat for dust species Gabriele Curci (U. L'Aquila)
v9-02 Mar 2014 Update molecular weight of sea salt tracers Colette Heald (MIT)
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
  • NOTE: Aerosol comparisons have been added to the standard 1 year benchmark, including speciated IMPROVE and PM2.5 from North America and Europe. Others are welcome to contribute 2005 observations to this effort (Colette Heald, CSU)
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

--Melissa Sulprizio 11:14, 17 January 2014 (EST)

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
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 into v10-01
Simplified description of uptake of SO2, nitric acid and sulfuric acid on mineral dust Duncan Fairlie, Langley
  • Delivered to GCST
  • Slated for inclusion into v10-01

--Bob Y. 15:05, 25 April 2014 (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)
Addition of effective wind speed to met fields for consistent resolution dust/sea salt emissions Jeff Pierce (CSU)
David Ridley (MIT)
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)

--Bob Y. 15:04, 25 April 2014 (EDT)

Aerosol optical properties

Please visit our new aerosol optical properties wiki page for more information about:

  1. Description of GEOS-Chem aerosol optics
  2. Aerosol optical properties update for v8-03-01
  3. 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

Issues / Topics for Discussion