OVERVIEW

The 4th GEOS–Chem Scientific and Users' Meeting was held from April 7–10, 2009 at Harvard University. It brought together over 160 scientists from more than 50 institutions and 15 countries.

We would like to thank NASA/ACMAP, EPRI, NSF-ATM for financial support; Harvard School of Engineering & Applied Science for facilities; Brenda Mathieu and the Jacob graduate students for logistics.

• View the meeting agenda (PDF format)
• View the list of GEOS–Chem meeting attendees (PDF format)
• View photos from the GEOS–Chem meeting (photographer: Peter Zoogman)

PRESENTATIONS AND POSTERS

All presentation files have been converted to Adobe PDF format in order to ensure that they display equally well on both PCs and Macs. Some presentations have additional QuickTime movie files.

Day 1, Apr 7: Model Overview and Development | Chemical Transport | Aerosol Sources and Chemistry | Aerosol Microphysics & Radiation | Biomass Burning

Day 2, Apr 8: Tropospheric Ozone | Photochemistry | Regional Air Quality | Regional Air Quality Observed from Space | Mercury | Carbon Gases

Day 3, Apr 9: Chemistry-Climate-Land Interactions | Software Engineering etc.

Day 4, Apr 10: Working Group Reports etc.

Day 1, Tuesday April 7

Model Overview and Development (Daniel Jacob, Harvard, chair)

PRESENTATIONS

• Welcome, meeting goals (Daniel Jacob, Harvard)

• GEOS-Chem model: new developments, future directions (Daniel Jacob, Harvard)

• GEOS-Chem code: new developments, future directions (Bob Yantosca, Harvard)

• Emissions update in standard and ESMF GEOS-Chem (Philippe LeSager, Harvard)

• GEOS-Chem model development activities (Claire Carouge, Harvard)

• GEOS-Chem adjoint: status and plans (Kevin Bowman, JPL)

• GMAO activities and partnership with GEOS-Chem (Steven Pawson, NASA/Goddard)

POSTERS

• GMI online in GEOS-5 (Steven Pawson, NASA/Goddard)

Chemical Transport (Steven Pawson, NASA/GFSC, chair)

PRESENTATIONS

• Using beryllium-7 to assess stratosphere-to-troposphere transport in global models (Hongyu Liu, Nat'l Inst. Aerospace/NASA Langley)

• Seasonal variations in the mixing layer in the UTLS (Dave McKenzie, U. Toronto)

• An analysis of pollution transport events during ARCTAS using aircraft, satellite, and model results (Jenny Fisher, Harvard)

• Trans-Pacific transport of black carbon and other aerosols into western N. America (Qinbin Li, UCLA)

• Intercontinental source attribution of ozone pollution at western U.S. sites using an adjoint model (Lin Zhang, Harvard)

• Transpacific transport of Asian dust and pollution (Junsan Nam , Georgia Tech)

• Interannual variations in transport of Asian pollution to  the Middle East (Jane Liu, U. Toronto)

• Impacts of PBL mixing representations on global model simulation of summertime surface ozone concentrations (Jintai Lin, Harvard)

• Model reduction algorithms in atmospheric pollution transport simulations (Mauricio Santillana, Harvard)

• Development and evaluation of GEOS-Chem driven by CCSM3 meteorological data (Daeok Youn, SNU)

POSTERS

• Using GEOS-Chem alongside observations from Mount Bachelor to understand the relationship between PAN and ozone during Spring 2008 (Emily Fischer, U. Washington)

Aerosol sources and chemistry (Jun Wang, U. Nebraska, chair)

PRESENTATIONS

• Retrieval of SO2 vertical columns from SCIAMACHY and OMI: air mass factor algorithm development (Chulkyu Lee, Dalhousie)

• Primary Biological Aerosol Particles (PBAP): an important part of the global organic aerosol budget? (Colette Heald, CSU)

• Can we constrain sea-salt emissions over the Southern Ocean? (Lyatt Jaeglé, U. Washington)

• Modeling dust and dissolved iron deposition to the Southern Ocean using GEOS-Chem (Nicholas Meskhidze, NC State)

• Impact of mineral dust on nitrate and sulfate partitioning over the Northern Pacific during INTEX-B (Duncan Fairlie, NASA/Langley)

• Impacts of Asian summer monsoon on aerosols over eastern China (Hong Liao, Chinese Acad. Sci.)

• Synthesis of satellite (MODIS), aircraft (ICARTT), and surface (IMPROVE, AERONET) aerosol observations over eastern North America to improve MODIS aerosol retrievals and constrain aerosol concentrations and sources (Easan Drury, NREL)

• Climate response to changing United States aerosol sources: historical and projected aerosol burdens using GEOS-Chem (Eric Leibensperger, Harvard)

POSTERS

• Aqueous-phase reactive uptake of dicarbonyls as a source of organic aerosol over eastern North America (Tzung-May Fu, Hong Kong Polytechnic U.)

• Exploring the effects of Patagonian dust on biological activity and carbon uptake in the South Atlantic Ocean using GEOS-Chem (Matthew Johnson, NC State)

Aerosols: microphysics and radiation (Hong Liao, Chinese Acad. Sci., chair)

PRESENTATIONS

• On the seasonality of aerosol optical thickness over the southeastern U.S.  (Jun Wang, U. Nebraska - Lincoln)

• Arctic Haze: Comparing GEOS-Chem and CALIPSO (Maurizio Di Pierro, U. Washington)

• Attributing direct radiative forcing to specific emissions using adjoint sensitivities (Daven Henze, U. Colorado)

• Two-moment aerosol sectional (TOMAS) microphysics in GEOS-Chem (Peter Adams, Carnegie-Mellon U.)

• Global particle size distributions simulated with GEOS-Chem incorporating a sectional aerosol microphysics model: Key features and comparison with observations (Fangqun Yu, SUNY Albany)

• Effect of oceanic organic carbon emissions on the growth of secondary particles and global CCN abundance (Gan Luo, SUNY Albany)

POSTERS

• Secondary organic aerosol formation from aqueous-phase reactions of glyoxal with OH radicals (Yong Bin Lim, Rutgers)

• Global distribution of CCN number concentration: Effect of sizes and emission heights of primary carbonaceous aerosol (Fangqun Yu, SUNY Albany)

• Particle size distributions and CCN concentrations in the global atmosphere: Uncertainties associated with sulfur emission inventories and primary sulfate emission parameterizations (Gan Luo, SUNY Albany)

• Quantifying aerosol direct radiative effect with MISR observations (Qinbin Li, UCLA)

• Fine-mode aerosol optical thickness over East Asia : GEOS-Chem simulations constrained by MODIS and CALIOP (Xiaoguang Xu, U. Nebraska – Lincoln)

Biomass burning (Bob Yokelson, U. Montana , chair)

PRESENTATIONS

• Large variations in vertical transport of surface fire emissions observed from space (Siegfried Gonzi, U. Edinburgh)

• Incorporating a 1-D plume-rise model parameterization into GEOS-Chem to simulate vertical transport of fire emissions over North America (Maria Val Martin, Harvard)

• The sensitivity of CO and aerosol transport to the temporal and vertical distribution of N. American boreal fire emissions (Yang Chen, JPL)

• Effects of Siberian forest fires on regional air quality and meteorology in spring 2003 (Rokjin Park , SNU)

• Geos-Chem simulations of the impact on tropospheric O 3 from the 2003 Canberra megafires (Nicholas Jones, U. Wollongong)

• Satellite detection and model analysis of wildfire  NO x emissions in Siberia: Links to interannual variability of surface ozone for the period 1998-2004 (Hiroshi Tanimoto, NIES)

• Nationwide impacts by fire emissions in the United Sates in summer 2002 (Tao Zeng , Georgia EPD)

• Comparing CO and O3 measurements from TES during ARCTAS with GEOS-Chem simulations (Matthew Alvarado, Harvard)

• Interpretation of OMI NO2 observations during ARCTAS (Nicolas Bousserez, Dalhousie)

POSTERS

• Recent measurements of biomass burning emissions and plume chemistry (Robert Yokelson, U. Montana)

• Observing boreal wildfire emissions from space: HCHO and NO2 (Kateryna Lapina, CSU)

Day 2: Wednesday, April 8

Tropospheric ozone (Yuhang Wang, Georgia Tech, chair)

PRESENTATIONS

• The HTAP model inter-comparisons: What do we learn about GEOS-Chem? (Mat Evans, U. Leeds )

• Spatially and temporally constraining the lightning flash rate  parameterization in GEOS-Chem and its impact on tropospheric ozone variability (and additional movie) (Lee Murray, Harvard)

• Interannual variability in tropical CO and ozone as seen by Aura satellite data and global models (Jennifer Logan, Harvard)

• The impacts of dynamics on tropical tropospheric ozone variability inferred from TES and GEOS-Chem Model (Junhua Liu, Harvard)

• Insight into processes affecting upper tropospheric ozone: interpretation of satellite (OSIRIS, MAESTRO, ACE) and in-situ observations (Matthew Cooper, Dalhousie)

• Assimilating Tropospheric Emission Spectrometer profiles in GEOS-Chem (K. Singh, Virginia Tech)

• Quantifying the impact of long-range transport of pollution on ozone abundances in the Arctic troposphere (Thomas Walker, U. Toronto)

POSTERS

• Partitioning the LIS/OTD lightning climatological dataset into separate ground and cloud flash distributions (William Koshak, NASA/Marshall)

• Improving techniques for satellite-based constraints of the lightning parameterization in a global chemical transport model (Lee Murray, Harvard)

• Spring O3 at Mount Washington Observatory:  implications for stratospheric intrusions (Yaping Xiao, U. New Hampshire )

Photochemistry (Lyatt Jaeglé, U. Washington , chair)

PRESENTATIONS

• Global model of the oxygen isotopic composition of atmospheric nitrate and comparison with observations (Becky Alexander, U. Washington)

• The sensitivity of the oxygen isotopes of sulfate to changes in oxidant concentrations during the preindustrial-industrial transition (Eric Sofen, U. Washington)

• New insights in isoprene photooxidation: from chamber studies to global model (Fabien Paulot, Caltech)

• Implications of the uptake and reaction of HO2 on aerosols (Helen McIntyre, U. Leeds)

• Assessing the oxidation capacity in the polar region (Jingqiu Mao, Harvard)

POSTERS

• Developments on tropospheric bromine chemistry in GEOS-Chem (Justin Parrella, Harvard)

Regional air quality (Rob Pinder, EPA, chair)

PRESENTATIONS

• Impacts of NO x emissions change on surface ozone in East Asia and China : the HTAP SR3 and SR6 cases (Joshua Fu, U. Tennessee)

• Air quality during the Beijing 2008 Olympics: effectiveness of emission restrictions (Yuxuan Wang, Tsinghua U.)

• High resolution modeling of CO spatial and temporal variations in Europe (Anna Protonotariou, Nat'l Obs. Athens )

• Gas & aerosol boundary conditions to Chimere CTM from GEOS-Chem (Gabriele Curci, U. L'Aquila)

• Investigating downscaling techniques for the linkage of GEOS-Chem and CMAQ (Yun-Fat Lam, U. Tennessee )

POSTERS

• Global health and economic impacts of future ozone pollution (Noelle Selin, MIT)

• Using GEOS-Chem in global multimedia models for life cycle assessment (Shanna Shaked, U. Michigan)

• A comparison of field observations with global and regional chemical mechanisms (Barron Henderson, U. North Carolina)

• Development of global and regional modeling emission inventories in support of climate-chemistry modeling using GEOS-Chem/CMAQ (Jung-Hun Woo, Konkuk U.)

• Climate change in the Eastern Mediterranean-Links with air quality (Kostas Varotsos, Nat'l Obs. Athens)

• Correlations between PM 2.5 and meteorology in the U.S. and its relation to climate change: a statistical study (Amos Tai, Harvard)

Regional air quality observed from space (Folkert Boersma, KNMI, chair)

PRESENTATIONS

• Adjoint inversion of SCIAMACHY NO 2 columns (Changsub Shim, JPL/Caltech)

• Seasonal variation in nitrogen oxides at northern midlatitudes as inferred from ground-based and satellite-based observations (Lok Lamsal, Dalhousie)

• Integrating satellite observation for assessing air quality over North America with GEOS-Chem (Mark Parrington, U. Toronto)

• Global ground-level PM2.5 concentrations inferred from MODIS and MISR observations (Aaron van Donkelaar, Dalhousie)

• Satellite remote sensing of a Multipollutant Air Quality Health Index (Randall Martin, Dalhousie)

• Estimating particle sulfate concentrations using MISR aerosol properties (Yang Liu, Emory U.)

• Observing System Simulation Experiments (OSSE) in support of GEO-CAPE science and measurement requirements definition [with additional movies: movie 1 movie 2] (Kevin Bowman, JPL)

POSTERS

• Air quality forecasting using geostationary satellite observations (Peter Zoogman, Harvard)

• Using satellite observations of tropospheric NO2 to test global changes in anthropogenic NOx emissions: from the Clean Air Act to the Mediterranean Sea and the 2008 Beijing Olympic Games (Folkert Boersma, KNMI)

• Assimilated inversion of NO x emissions over East Asia using OMI NO2 column measurements (Yuhang Wang , Georgia Tech)

• The impact of Hurricanes Katrina and Rita on pollution emissions as inferred by OMI NO2 (Bryan Duncan, NASA/GSFC)

• Application of OMI Ozone Profiles in CMAQ (Lihua Wang, U. Alabama Huntsville)

• Constraint on anthropogenic NOx emissions in China from different sectors: a new methodology using multiple satellite retrievals (Jintai Lin, Harvard)

Mercury (Elsie Sunderland, Harvard, chair)

PRESENTATIONS

• A global mercury simulation and budget based on Hg+Br chemistry (Chris Holmes, Harvard)

• Changing emissions and global mercury cycling (Elizabeth Corbitt, Harvard)

• Incorporating a global terrestrial mercury model into GEOS-Chem (Nicole Smith-Downey, U. Texas)

• Evaluating mercury exposure and source attribution using GEOS-Chem (Noelle Selin, MIT)

POSTERS

• Enhancements to the ocean mercury modeling capability in GEOS-Chem (Elsie Sunderland, Harvard)

Carbon gases (Qinbin Li, UCLA, chair)

PRESENTATIONS

• Northern hemispheric CO source estimates as derived in an adjoint inversion from combined MOPITT, AIRS and SCIAMACHY measurements of CO columns (Monika Kopacz, Harvard)

• Evidence for a soil source of CO in the deserts of Saudi Arabia (Dylan Jones, U. Toronto)

• Modeling CO2 and its sources and sinks with GEOS-Chem (Ray Nassar, U. Toronto)

• What can we learn about upper tropospheric CO2? (Xun Jiang, JPL)

• Using satellite data in joint CO2 - CO inversion (Helen Wang, Harvard)

• Atmospheric constraints on the global budget of carbonyl sulfide (Parvadha Suntharalingam, U. East Anglia)

• Primary and secondary sources of atmospheric acetaldehyde (Dylan Millet, U. Minnesota)

• Methane source contribution in the Arctic: a study using GEOS-Chem and  airborne CH4 measurements obtained during ARCTAS-08 (Christopher Pickett-Heaps, Harvard)

• Evaluating hotspot tropospheric methane concentrations in Himalaya region with GEOS-Chem and AIRS satellite retrievals (Jinyun Tang, Purdue)

POSTERS

• A satellite perspective on the inter-hemispheric transport of CO (Chenxia Cai, JPL)

• Quantifying the impact of aggregation errors and model transport biases on top-down estimates of carbon monoxide emissions using satellites observations (Zhe Jiang, U. Toronto)

• Atmospheric formic acid: modeling and satellite remote sensing (Gonzalo Gonzalez Abad, York U. )

• Evaluating a simulation of methane using ground-based and satellite measurements (Annemarie Fraser, U. Edinburgh)

• Inversion analysis of North American methane emissions Using INTEX-NA aircraft data (Kevin Wecht, Harvard)

• BVOC emissions in GEOS-Chem:  model evaluation at two tropical rain forest sites (Michael Barkley, U. Edinburgh)

Day 3: Thursday, April 9

Chemistry-Climate-Land Interactions (Dylan Millet, U. Minnesota , chair)

PRESENTATIONS

• New directions in studies of chemistry-climate interactions using GEOS-Chem (Loretta Mickley, Harvard)

• Effects of tropical deforestation on tropospheric chemistry: a 10-year study using GEOS-Chem (Prasad Kasibhatla, Duke)

• Impacts of changes in land use/land cover on chemistry & air quality (Shiliang Wu , Michigan Tech)

• Future inorganic aerosol levels (Havala Pye, Caltech)

• Application of sensitivity of ozone air quality to temperature change to validate chemical transport models for future ozone simulation over the United States (Moeko Yoshitomi, Harvard)

• Impact of climate change on North American wildfire and ozone air quality in the United States (Rynda Hudman, UC Berkeley)

• Effects of climate change on future forest fire and its impact on regional air quality (Hyun Cheol Kim, U. Houston )

• Re-thinking the IPCC radiative forcing bar chart: the sector based paradigm (Nadine Unger, GISS)

Software Engineering etc.

• Software engineering, code development, user support issues (Bob Yantosca, Philippe LeSager, Claire Carouge, leads)

• Adjoint Model Clinic (led by: Daven Henze, Monika Kopacz, Kumaresh Singh)

Day 4: Friday, April 10

Working Group Reports

• Adjoint (co-chairs Kevin Bowman, Daven Henze)
• Aerosol processes (co-chairs Colette Heald, Fangqun Yu)
• Carbon gases (co-chairs Dylan Jones, Prasad Kasibhatla)
• Chemistry-climate interactions (co-chairs Becky Alexander, Loretta Mickley)
• Emission inventories (co-chairs Jennifer Logan, Randall Martin)
• Oxidants and chemistry (co-chairs Mat Evans, May Fu)
• Regional modeling (co-chairs Rokjin Park , Yuxuan Wang)

GEOS–Chem Model Clinic

• Model Clinic Summary (led by: Bob Yantosca, Philippe Le Sager, Claire Carouge)