GMAC 2026: Final Program Agenda

Tuesday, 19 May

Session 1: Welcome and Keynote Session

(Gary Morris and Youmi Oh, Chairs)

• 8:30 – Vanda Grubišić (GML Director): Welcome from the Global Monitoring Laboratory
• 8:45 – Jennifer Mahoney (NOAA OAR - Deputy Assistant Administrator for Science): Overview from NOAA Oceanic & Atmospheric Research
• 9:15 – Jennifer Balch (CU Boulder): Keynote Address – From Ember to Exabyte: Extreme Fires Across Scales

10:00 – Break

Session 2: Decoding Drivers: Assessing Wildfire, Biosphere, and Transport Impacts on the Atmosphere

(Gary Morris, Chair)

• 10:30 – John Miller (NOAA - GML): Understanding the Causes of the Unprecedented Growth of Atmospheric CO2 in 2024
• 10:45 – Dan Jaffe (University of Washington): Smokeless Smoke? Investigating Aerosol Removal in Smoke Plumes
• 11:00 – Youmi Oh (CU Boulder - CIRES; GML): Integrating Satellite and Isotopic Observations in CarbonTracker-CH4 for Improved Methane Emission Estimates During 2019-2024
• 11:15 – Steve Montzka (NOAA - GML): Insights Into Atmospheric Sources, Sinks, and Transport Processes from Globally-Distributed Measurements of Long-Lived Gases
• 11:30 – Jeff Peischl (CU Boulder - CIRES; GML): A Comparison of CO2, CH4, and CO Measurements from the National Observations of GHGs Using Aircraft Profiles (NOGAP) Campaign with Three Global Models
• 11:45 – Xin Lan (CU Boulder - CIRES; GML): Updates on Global CO2, CH4, N2O, and SF6 Measurements from NOAA’s Global Greenhouse Gas Reference Network

LUNCH & POSTER SESSION

• 12:00 – Lunch
• 12:15 – Early Career Lunch & Panel Discussion
• 13:30 – Poster Session (See Poster Program for details)

15:30 – Break

Session 3: The Carbon Pulse: Ocean Sinks & Terrestrial Feedbacks

(Aleya Kaushik, Chair)

• 16:00 – Britton Stephens (NCAR): Zonal-Mean Southern Ocean Air-Sea CO2 Exchange Measured from Operational Military Transport Aircraft
• 16:15 – Eric Morgan (Scripps): Atmospheric O2 Measurements Show a Strengthening Ocean Carbon Sink and a Stagnant Terrestrial Carbon Sink Since 1990
• 16:30 – Lei Hu (NOAA - GML): Evaluation of Uncertainties in Lagrangian Particle Dispersion Models Using Atmospheric Radiocarbon Measurements
• 16:45 – Madat Sardarli (Scripps): Advances in Interpreting Atmospheric CO2 Variability at Mauna Loa and Maunakea Observatories with Covarying Records
• 17:00 – Haeyoung Lee (Earth Science NZ): A 20-Year Inter-Laboratory Comparison of Atmospheric 13C-CO2 δ in the Southern Hemisphere: Co-Located Measurements at Baring Head Observatory Demonstrate Improved Compatibility
• 17:15 – Issy Borley (CSIRO): Kennaook Cape Grim 50 Year Record of Atmospheric Observations and Recent Trends

Wednesday, 20 May

Session 4: Ozone, Particulate Matter, and Air Quality

(Elizabeth Asher, Chair)

• 8:30 – Anne Thompson (UMBC; NASA GSFC): Free Tropospheric Ozone Trends: New Insights from 25 Years of Ground-Based Observations
• 8:45 – Joshua Richards (UMBC): Influence of ENSO Teleconnection on Surface Ozone Exceedances (1980–2024)
• 9:00 – Peter Effertz (CU Boulder - CIRES; GML): An Ensemble Kalman Filter Approach to the Dobson Umkehr Ozone Retrievals
• 9:15 – James Sherman (Appalachian State): Changing SE U.S. Air Quality and Aerosol Radiative Effects
• 9:30 – Minsu Choi (CU Boulder - CIRES; GSL): Change in surface radiation budget due to smoke from the wildfires during 2018 and 2019 fire seasons in the US: Insight from high-resolution WRF-Chem modeling and ground-based radiation observations
• 9:45 – Erin Boedicker (CU Boulder - CIRES; GML): Evaluating Long-Term Seasonal Variability of Aerosol Optical Properties in Colorado

10:00 – Break

Session 5: Methane & Trace Species: Sources, Sinks, and Isotopes

(Bianca Baier, Chair)

• 10:30 – Benjamin Gaubert (NCAR): Modelling OH Radicals' Impacts on the CO and CH4 Budget During 2003-2022
• 10:45 – Vasilii Petrenko (University of Rochester): Measurements of 14CO and 14CH4 in the FETCH4 Project Global Network to Constrain [OH] Variability and the CH4 Fossil Source
• 11:00 – Michael Dyonisius (CU Boulder - INSTAAR): Atmospheric Δ 14CH4 Supports High Baseline Fossil Methane Emissions of ~140 Tg/yr in 2010-2020 Consistent with Dual-Tracer (CH4 + δ 13CH4) Inversion
• 11:15 – Ryan Stauffer (NASA GSFC): SCOAPE-II: A 2024 Multiplatform Measurement Campaign to Assess Oil and Gas Emissions on the Outer Continental Shelf
• 11:30 – Pedro de Melo (CU Boulder - CIRES; GML): Machine Learning-Based Analysis of Oil and Gas Methane Emissions in the Gulf of Mexico Using Publicly Available Satellite Data
• 11:45 – Detlev Helmig (Boulder A.I.R., LLC): Underestimation of Oil and Gas Industry Emissions in Inventories

LUNCH

• 12:00 – Lunch

Session 6: Atmospheric Dynamics, Clouds, and Radiation

(Laura Riihimaki, Chair)

• 13:30 – David Clemens-Sewall (CU Boulder): Potential Impacts of Marine Cloud Brightening in the Arctic
• 13:45 – Tom Dror (CU Boulder - CIRES; CSL): Deforestation-Driven Clouds Amplify Top-of-Atmosphere Cooling in the Amazon
• 14:00 – Eshkol Eytan (CU Boulder - CIRES; CSL): On the Effect of Clouds on the Aerosol Radiative Effect Across Cloud Regimes
• 14:15 – Joseph Sedler (CU Boulder - CIRES; GML): Applying NOAA GML’s Radiation, Aerosol, and Clouds (G-RAD) Division Observations and Products to Evaluate and Inform NOAA’s NWP
• 14:30 – Jessica Lyons (CSU): Using NOAA's SF6 Measurement Network to Characterize Atmospheric Transport Uncertainty and its Effect on Large Scale CO2 Emissions Estimates
• 14:45 – Eric Ray (CU Boulder - CIRES; CSL): The Critical Role of AirCore in Stratospheric Circulation Monitoring

15:00 – Break

Session 7: Integrated Networks: Satellites, Aircraft, and Scale-Bridging

(Sara Morris, Chair)

• 15:30 – Arlyn Andrews (Silver Lining): A New Approach for Leveraging the Complementarity of Diverse Satellite and In Situ Observations for Greenhouse Gas Tracking and other Atmospheric Composition Applications
• 15:45 – Christopher O’Dell (CSU - CIRA): The Scientific and Societal Importance of the Orbiting Carbon Observatories
• 16:00 – Kathryn McKain (NOAA - GML): Evaluation of Carbon Fluxes in East Tropical Africa from OCO-2 Satellite Retrievals and Global Inversion Models with In Situ Vertical Profile Measurements
• 16:15 – Temple Lee (NOAA - ARL): The Chestnut Ridge Supersite: A Revamped Observing System for Studying Land-Atmosphere Interactions and Feedbacks in a Southern Appalachian Forest
• 16:30 – Katie Smith (CU Boulder - CIRES; CSL): The NOAA Balloon Baseline Stratospheric Aerosol Profiles (B2SAP) Dataset for In Situ Measurements of Stratospheric Aerosol
• 16:45 – Colm Sweeney (NOAA - GML): Using Commercial Aircraft to Monitor Urban Carbon Reservoirs

Poster Sessions

(Christine Smith & Eric Hintsa, Chairs)

13:30 - 15:30 Tuesday, 19 May

Session P1: The Carbon Pulse: Ocean Sinks & Terrestrial Feedbacks

1. Kerstin Braun (CU Boulder - INSTAAR): δ 18O of Atmospheric CO2 from the NOAA Global Monitoring Network
2. Leslie Morales (Sao Paulo University): Characterizing CO2 Emissions with Δ14C-CO2, CO2, and CO in Urban, Suburban, and Background Sites of São Paulo
3. Aleya Kaushik (CU Boulder - CIRES; GML): Advancing Fire Modeling Capabilities for Understanding Terrestrial Carbon Exchange
4. Yanxiao Liu (CU Boulder): Preliminary Sensitivity Tests of X-STILT Parameters for Tropical Ecosystem Applications in the Amazon Region
5. Ximeng Huang (CU Boulder): What Drove the Response of Ecosystem Photosynthesis to 2023/24 Drought in the Amazon Tropical Forest
6. Ajay Devda (Colorado State University): Hydrodynamics-informed Carbon Monitoring in Tropical Coastal Wetlands Using Harmonized Landsat-Sentinel (HLS) Product
7. David Munro (CU Boulder - CIRES; GML): On the Utility of Ship-Based Atmospheric CO2 Measurements for Constraining Air–Sea CO2 Fluxes
8. Ashley Pera (CU Boulder - CIRES; GML): Toward a Unified CarbonTracker: Consolidating NOAA GML's CO2 and CH4 Flux Estimates

Session P2: Ozone, Particulate Matter, and Air Quality

9. Lori Bruhwiler (NOAA - GML): NH Air Quality and Methane Emissions from Tropical Africa
10. Dylan Gaeta (CU Boulder - CIRES; GML): A Decline But No Cessation of Methyl Bromide Emissions from the United States Over 2007-2018
11. Behrooz Roozitalab (NCAR): Airborne Measurements of Bromoform and Dibromomethane and the Potential Impact of Changing Oceans on Their Future Emissions
12. Eric Hintsa (CU Boulder - CIRES; GML): Halogen Compounds in the Northern Hemisphere Stratosphere: from Summer Midlatitudes to the Polar Vortex
13. Mark Kutchenreiter (CU Boulder - CIRES; GML): Global Monitoring Laboratory- Wildfire Research Mobile Monitoring Systems
14. Thomas Batalia (Appalachian State University): The Influence of Local Meteorology and Air Mass Source Region on Aerosol Light Scattering and Absorption Measurements at Appalachian State University

15. Gary Morris (NOAA - GML): Optimizing Ozone Profile Sampling Frequency for Trend Calculations

Session P3: Methane & Trace Species: Sources, Sinks, and Isotopes

16. Gabrielle Petron (CU Boulder - CIRES; GML): First Look at the NOAA GML CO Flask Measurements on the X2025 Calibration Scale
17. Santanu Halder (CU Boulder - CIRES; GML): Investigating the Capability of Atmospheric δD-CH4 in Reducing the Uncertainty in the Global Methane Budget
18. Ben Riddell-Young (CU Boulder - CIRES; GML): Trend in Atmospheric 13 δ C-CH4 Suggests Methane Growth in 2024 and 2025 Was Driven by Increased Fire and Fossil Fuel Emissions
19. John Ortega (CU Boulder - INSTAAR): Deuterium Measurements of Atmospheric Methane from the NOAA Global Flask Network and Inter-Laboratory Intercomparisons
20. Betsy Farris (CU Boulder): Towards Mitigation Scale: Supporting Methane Emissions Management by Connecting Spatial Scales with Satellites
21. Jianghanyang Li (CU Boulder - INSTAAR): Application of Oxidation Flow Reactors to Methane Isotopes
22. Ivan Ortega (NCAR): Global Monitoring Capabilities with NDACC HR-FTIR: From Retrieval Optimization to Model Evaluation and Extreme Events

Session P4: Atmospheric Dynamics, Clouds, and Radiation

23. Vanessa Caicedo (CU Boulder - CIRES; GML): A Machine Learning Derived Integrated Dataset of SURFRAD Radiation, Cloud, and Boundary Layer Height Observations for Land-Atmosphere-Cloud Interactions
24. Jung-Sub Lim (CU Boulder - CIRES; CSL): Cloud-Driven Stochastic Variability Sustains Radiative Bimodality in the Arctic Winter: Insights from Long-Term Arctic Observations
25. Ben Sykes (Appalachian State University): Initial Characterization Of Cloud Condensation Nuclei Activity In The Southeastern United States

Session P5: Integrated Networks: Satellites, Aircraft, & Scale-Bridging

26. Eric Moglia (CU Boulder - CIRES; GML): NOAA GML’s Greenhouse Gas Reference Network Management, Logistics, and Importance
27. Joshua Mauss (CU Boulder - CIRES; GML): Quantifying the Effects of Long-Term Storage on Measurements of Carbon Dioxide from Air Samples in Flasks
28. Emily Kaiser (CU Boulder - CIRES; GML): Statistical Flagging of Longterm Records of Multiple Gases from Flask Samples Collected at Continental Tall Tower Sites

29. Janae Csavina (National Ecological Observatory Network): Sensor Life Cycle Management for Traceable Measurements in National Ecological Observatory Network (NEON)
30. Sara Morris (NOAA - GML): CAO Tower Meteorological Deployment and Opportunities
31. Christine Smith (NOAA - GML): NOAA’s Mauna Loa Atmospheric Baseline Observatory – Site Status and Redevelopment Project Updates
32. Janelle Hakala (CU Boulder - CIRES; GML): Deploying and Testing a Next Generation In-Situ Measurement System at NOAA’s South Pole Atmospheric Baseline Observatory
33. Debra Kollonige (ADNET Systems, Inc.; NASA GSFC): Southern Hemisphere Additional Ozonesondes (SHADOZ) Network Updates and Tropospheric Ozone Trends for the TOAR-II Activity
34. Peter Effertz (CU Boulder - CIRES; GML): Design and Implementation of a Relational SQL Database for Ozone and Water Vapor Measurements
35. Glen McConville (CU Boulder - CIRES; GML): Global Calibration Activities of the Dobson Network Based on the World Primary Standard Spectrophotometer D083
36. Irina Petropavlovskikh (CU Boulder - CIRES; GML): Ground-Based Validation of the Operational Satellite Ozone Products: An Assessment of Ozone Recovery and Processes Impacting Its Short-Term Variability
37. Elizabeth Asher (CU Boulder - CIRES; GML): Improving Sulfuric Acid Percent Weight A Priori Assumptions for Satellite Retrievals: Insights from Boulder, Hilo, and Lauder NOAA FPH Records
38. Alexis Badder (Picarro): An Improved Analyzer for High-Precision and Low-Drift N2O, CO, and 13CO2 Ambient Monitoring