Presentations

2021:

Wong AYH, Geddes JA, Val Martin M, Ming FK, Emmons L, “Impact of global climate and land use change on soil reactive nitrogen emissions: implication on air quality from CESM2.1”, 26th Annual CESM Workshop, Whole Atmosphere and Chemistry-Climate Working Group.

Geddes JA, “Air Quality and Surface-Atmosphere Interactions: Modeling and remote sensing from urban-to-global scales”, Environment and Climate Change Canada Air Quality Research Division Seminar Series.

Geddes JA, “Exploring Contemporary Changes in Biosphere-Atmosphere-Chemistry Interactions”, Dalhousie University Atmospheric Science Seminar Series.

2020:

Geddes JA, “Exploring Contemporary Changes in Biosphere-Atmosphere-Chemistry Interactions”, Frontiers in Atmospheric Chemistry Seminar Series

Wong AYH, Geddes JA, Emmons LK, Val Martin M, “Quantifying Present and Future Impacts of Reactive Soil Nitrogen Emissions on Global Air Quality”, Fall Meeting of the AGU

Adams TJ, Geddes JA, Spinei E, Brown L, “Reconciling Ground-Based Remote Sensing and In-Situ Observations of COVID-related Air Quality Changes in the Boston area”, Fall Meeting of the AGU

Geddes JA, “Early Results from an Intra-Urban Deployment of Pandoras in a Coastal Urban Environment”, Annual TOLNet-Pandora Science Team Workshop

Geddes JA, “Early Results from a Pandora Network in Boston”, TEMPO Science Team Meeting

Adams TJ, Geddes JA, Abad GG, Souri AH, Miller C, Nowlan CR, Jung Y, Chance K, “Early Results and New Insights into Tropospheric NO2 Variability from a Network of Pandora Spectrometers in a Coastal Urban Environment”, American Meteorological Society Meeting (Boston)

2019:

Geddes JA, “Checking Atmospheric Chemistry’s Pulse: Modeling and Remote Sensing of Biosphere Interactions”, University of Washington Department of Atmospheric Sciences Colloquium

Geddes JA, Adams T, Abad G, Souri A, Miller C, Nowlan C, Jung Y, Chance, K, and Kang S, “Optimized Pandora Network for Urban-Scale Evaluation”, Oral Presentation, TEMPO Science Team Meeting (Madison WI, June 2019)

Geddes JA, “Update and Future Directions of Satellite Remote Sensing Activities Related to MMF-GTAD”, Oral Presentation, Expert Meeting on Measurement-Model Fusion for Global Total Atmospheric Deposition (World Meteorological Organization, Geneva, February 2019)

Geddes JA, “Biogenic ozone precursors in nonattainment areas of the US: Decreasing sensitivity to isoprene, increasing vulnerability to soil NOx”, Gordon Research Conference on Atmospheric Chemistry (Newry ME)

Wong AYH, Geddes JA, Ducker J, Holmes CD, “Constraining Ozone Dry Deposition Using Ozone and Water Vapor Flux Measurements”, Fall Meeting of the AGU (San Francisco CA)

2018:

Geddes JA, “Characterizing Sea Breeze Effects on Surface Ozone Concentrations in the Boston Region, and Implications for Remote Sensing of Local Air Quality”, Oral Presentation, Fall Meeting of the American Geophysical Union (Washington DC, December 2018)

Wong AYH, Geddes JA, Tai APK, “Long-term Global Multi-physical Modeling of Ozone Dry Deposition Velocity – with Focus on Process Uncertainty and Implication on Air Quality Modeling”, Poster Presentation, Fall Meeting of the American Geophysical Union (Washington DC, December 2018)

Geddes JA, Martin RV, Bucsela E, McLinden CL, “NO2 Stratosphere-Troposphere Separation Strategy for TEMPO (and possible lessons for GEMS)”, Oral Presentation, 9th GEMS Science Team Meeting (Seoul, Korea, September 2018)

Geddes JA, Martin RV, Bucsela EJ, McLinden CL, “NO2 Stratosphere-Troposphere Separation”, Oral Presentation, TEMPO Science Meeting (NCAR , Boulder CO, June 2018)

Geddes JA, “Investigating Rapid Contemporary Changes in Biosphere-Atmosphere-Chemistry Interactions with a Chemical Transport Model”, Oral Presentation, 101st Canadian Chemistry Conference (Edmonton AB, May 2018)

2017:

Geddes JA, “Impacts of Interannual Variability in Biogenic VOC Emissions near Transitional Ozone Production Regimes”, Oral Presentation, Fall Meeting of the American Geophysical Union (New Orleans, December 2017)

Pusede S, Geddes JA, Buysse CE, Esperanza A, Najacht E, Anderson JF, Baily CB, Munyan J, “On the Effects of NOx Emission Control and Drought on an Ozone-Polluted Ecosystem”, Oral Presentation, Fall Meeting of the American Geophysical Union (New Orleans, December 2017)

Geddes JA, “Interannual Variability in Biogenic Isoprene Emissions: Tipping the Scales in Transitional Ozone Production Regimes?”, Poster Presentation, Gordon Research Conference in Atmospheric Chemistry (Newry ME, August 2017)

Geddes JA, and Martin RV, “Strategies for Stratosphere-Troposphere Separation of NO2 from TEMPO”, Oral Presentation, TEMPO Science Meeting (Harvard-Smithsonian Center for Astrophysics, Harvard University, May 2017)

Geddes JA and Martin RV, “Global Deposition of Reactive Nitrogen Oxides inferred from Satellite Observations of NO₂“, Oral Presentation, 8th International GEOS-Chem Meeting (Harvard University, May 2017)

Geddes JA, “Satellite Measurement-Model Fusion for Global Deposition and Health Assessments”, Invited Talk, WMO Global Atmospheric Watch Workshop on Measurement-Model Fusion for Global Total Atmospheric Deposition (Geneva, Switzerland, February 2017)

2016:

Geddes JA, Cunningham D, Martin RV, “Strategies for Stratosphere-Troposphere Separation of Nitrogen Dioxide Columns from the TEMPO Geostationary Instrument”, Poster Presentation, Fall Meeting of the American Geophysical Union (San Francisco CA, December 2016)

Wong AYH, Tai APK, Geddes JA, “Effects of land use and land cover change on global ozone air quality in the mid-21st century”, Poster Presentation, Fall Meeting of the American Geophysical Union (San Francisco CA, December 2016)

Geddes JA, Martin RV, Heald CL, Silva SJ, “Rapidly changing interactions between forests and atmospheric chemistry: contemporary changes in land cover and anthropogenic emissions”, Poster Presentation, International Global Atmospheric Chemistry Science Conference (Breckenridge CO, September 2016)

Pusede S, Geddes JA, Kent K, Decesare W, “Drought impacts on high ozone in California”, Oral Presentation, International Global Atmospheric Chemistry Science Conference (Breckenridge CO, September 2016)

Geddes JA and Martin RV, “Development of Methods for Retrieval and Interpretation of TEMPO NO2 columns for Top-down Constraints on NOx Emissions and NOy Deposition”, Oral Presentation, TEMPO Science Team Meeting (Washington DC, June 2016)

2015 and earlier:

Geddes JA, Heald CL, Silva SJ, Martin RV, “Simulating the impacts of large scale insect- and disease-driven tree mortality on atmospheric chemistry”, Oral Presentation, Fall Meeting of the American Geophysical Union (San Francisco CA, December 2015)

Silva SJ, Heald CL, Geddes JA, Marlier ME, Austin K, Kasibhatla PS, “Oil Palm expansion over Southeast Asia: land use change and air quality”, Poster Presentation, Fall Meeting of the American Geophysical Union (San Francisco CA, December 2015)

Geddes JA, “Exploring the impacts of large-scale tree mortality on atmospheric chemistry using modified land-atmosphere exchange in GEOS-Chem”, Oral Presentation, Thirteenth Atmospheric Chemistry Colloquium for Emerging Senior Scientists (Brookhaven National Laboratory NY, July 2015)

Geddes JA, Martin RV, Heald CL, “Simulating insect-driven tree mortality impacts on atmospheric chemistry”, Poster Presentation, Gordon Research Conference in Atmospheric Chemistry (Waterville Valley NH, August 2015)

Geddes JA, Martin RV, Heald CL, “Land Cover Change and Atmospheric Chemistry: A new land cover module for GEOS-Chem”, Oral Presentation, 7th International GEOS-Chem Meeting (Harvard University MA, May 2015)

Martin RV, van Donkelaar A, Boys BL, Geddes JA, Kharol S, Lee CL, Nowlan RC, Snider G, Weagle C, Xu J, “Advances in studies of air quality and health informed with satellite remote sensing”, Oral Presentation, Fall Meeting of the American Geophysical Union (San Francisco CA, December 2014)

Geddes JA, Martin RV, Boys BL, “Integrating satellite observations, chemical transport modeling, and population data to estimate decadal trends in ground-level NO2 exposure worldwide”, Poster Presentation, Fall Meeting of the American Geophysical Union (San Francisco, December 2014)

Pugliese SC, Murphy JG, Geddes JA, Wang JM, “The impacts of precursor reduction and meteorology on ground-level ozone in the Greater Toronto area”, Oral Presentation, Urban Environmental Pollution 2014 (Toronto, June 2014).

Geddes JA, Murphy JG, “Reactive nitrogen oxides fluxes above two mid-latitude North American mixed hardwood forests”, Oral Presentation, National Atmospheric Deposition Program Annual Meeting and Scientific Symposium (Park City UT, October 2013).

Geddes JA, Murphy JG, “Observations of reactive nitrogen oxide fluxes by eddy covariance above a mid-latitude mixed hardwood forest”, Oral Presentation Fall Meeting of the American Geophysical Union (San Francisco, December 2012)

Wang J, Murphy JG, Winsborough CL, Basiliko N, Geddes JA, Thomas S, “Methane fluxes measured by eddy covariance at a temperate upland forest”, Poster Presentation, Fall Meeting of the American Geophysical Union (San Francisco, December 2012)

Geddes JA, Murphy JG, “Observations of mixing ratios and fluxes of reactive nitrogen oxides above a mixed hardwood forest in central Ontario during the summer and fall of 2011”, Oral Presentation, First Conference on Atmospheric Biogeosciences (Boston, May 2012)

Geddes JA, Murphy JG, Thomas SC, Schurman J, Filewod B, Petroff A, “Observations of canopy-scale carbon fluxes at a mid-latitude mixed hardwood forest and decreased growing season productivity due to record high temperatures during leaf emergence”, Oral Presentation First Conference on Atmospheric Biogeosciences (Boston, May 2012)

Petroff A, Murphy JG, Thomas SC, Geddes JA, “Dry deposition of particulate nitrogen in a broadleaf forest: The importance of the coarse mode”, Oral Presentation, First Conference on Atmospheric Biogeosciences (Boston, May 2012)

Murphy JG, Wang J, Winsborough C, Basiliko N, Geddes JA, Whomas SC, “Methane fluxes measured by eddy covariance at a temperate upland forest in central Ontario”, Oral Presentation, First Conference on Atmospheric Biogeosciences, (Boston, May 2012)

Geddes JA, Murphy JG, Winsborough W, Basiliko N, Thomas SC, Petroff A, Desousa A, “Biosphere-atmosphere exchange at a mixed hardwood forest in Central Ontario subject to high nitrogen deposition”, Oral Presentation, Annual Meeting of the Canadian Meteorological and Oceanographic Society (Victoria, June 2011)

Geddes JA, Murphy JG, O’Brien J, Celarier EA, “Potential selection biases in satellite observations of NO2 and SO2 due to clouds”, Oral Presentation, Joint Meeting of the Canadian Geophysical Union – Canadian Meteorological and Oceanographic Society (Ottawa, June 2010)

Murphy JG, Geddes JA, Petroff A, Desousa A, Ellis R, Thomas SC, “Monitoring carbon, nitrogen, and particulate matter exchange in a northern hardwood forest subject to high N deposition”, Poster Presentation, 29th Conference on Agricultural and Forest Meteorology (Keystone CO, August 2010)

Celarier EA, Murphy JG, Geddes JA, Gleason JF, “Satellite retrieval and ground based measurements of NO2”, Oral Presentation, American Geophysical Union Joint Assembly (Toronto ON, May 2009)

Geddes JA, Murphy JG, “Investigation of the role of Ox partitioning and particle load on nocturnal Ox loss”, Poster Presentation, Canadian Society of Chemistry Annual Meeting (Hamilton, June 2009)

Celarier EA, Gleason JF, Murphy JG, Geddes JA, “OMI measurements of NO2 in the greater Toronto area: Consistency with in situ measurements”, Oral Presentation, Air and Waste Management Association Symposium on Air Quality Measurements Methods and Technology (Chapel Hill, November 2008)

Celarier EA, Kurosu TP, Murphy JG, Geddes JA, Bucsela EJ, Bojkov BR, Retscher C, “Properties of urban NO2 fields from OMI measurements”, Oral Presentation, American Geophysical Union Joint Assembly, (Fort Lauderdale, May 2008)

Geddes JA, Murphy JG, “Investigating long term changes in nitrogen oxides and volatile organic compounds in the city of Toronto and their effect on local ozone production”, Poster Presentation, Fall Meeting of the American Geophysical Union (San Francisco, December 2008)

McGillen M, Percival C, Ghalaieny M, Booth AM, Murphy JG, Popescu R, Geddes JA, “Field measurements of ammonia in Edinburgh, Scotland between August-September 2008: a comparison between CIMS and QCL techniques”, Poster Presentation, Fall Meeting of the American Geophysical Union (San Francisco, December 2008)