North American Research Strategy for Tropospheric Ozone

North American Research Strategy for Tropospheric Ozone
Name	North American Research Strategy for Tropospheric Ozone
Abbreviation	NARSTO
Formation	1995
Type	Consortium
Region	North America
Headquarters	North America

North American Research Strategy for Tropospheric Ozone The North American Research Strategy for Tropospheric Ozone was a multinational technical consortium formed to coordinate scientific study of tropospheric ozone across Canada, Mexico, and the United States. It brought together researchers from institutions such as the National Aeronautics and Space Administration, Environment and Climate Change Canada, and the Mexican Secretariat of Environment and Natural Resources to harmonize measurement, modeling, and policy-relevant synthesis for air quality and atmospheric chemistry challenges. The partnership interfaced with academic centers like Massachusetts Institute of Technology, University of California, Berkeley, and University of Toronto and with federal agencies including the United States Environmental Protection Agency, National Oceanic and Atmospheric Administration, and Natural Resources Canada.

Background and Development

NARSTO emerged from collaborations among scientific programs linked to Clean Air Act implementation, transboundary pollutant concerns following the 1979 Convention on Long-Range Transboundary Air Pollution, and atmospheric chemistry initiatives associated with the International Geosphere-Biosphere Programme, World Meteorological Organization, and the International Global Atmospheric Chemistry Project. Founding participants included research groups from Oak Ridge National Laboratory, Los Alamos National Laboratory, and universities such as University of Colorado Boulder, Carnegie Mellon University, and McGill University. Early workshops were hosted alongside meetings of the North American Commission for Environmental Cooperation, the Environmental Protection Agency Science Advisory Board, and panels of the National Research Council. Funding and logistical support derived from agencies like the Natural Sciences and Engineering Research Council of Canada, the National Science Foundation, and bilateral programs between Canada and the United States.

Objectives and Scope

NARSTO aimed to reduce scientific uncertainties about tropospheric ozone formation, transport, and impacts to inform regulators implementing standards such as those under the Clean Air Act Amendments of 1990 and to advise regional bodies like the Ozone Transport Commission and the Commission for Environmental Cooperation. Its scope covered emissions inventories developed by groups such as the Emissions Database for Global Atmospheric Research, satellite-derived products from NASA, field observations from networks coordinated with the Aerodyne Research community, and model intercomparisons involving centers like European Centre for Medium-Range Weather Forecasts, National Center for Atmospheric Research, and university-based modeling groups.

Research Components and Methodologies

Research under NARSTO combined laboratory kinetics informed by laboratories at Scripps Institution of Oceanography and California Institute of Technology with chamber studies led by teams from National Institute of Standards and Technology and field experiments coordinated with NOAA platforms. Methodologies included emission inventory reconciliation drawing on inventories from Environment Canada and Secretaría de Medio Ambiente y Recursos Naturales, receptor modeling employing techniques from California Air Resources Board studies, and chemical transport modeling using frameworks from Community Multiscale Air Quality Modeling System, GEOS-Chem, and regional models developed at Rutgers University. Intercomparison exercises followed protocols similar to those of the World Climate Research Programme and used statistical frameworks from American Statistical Association-affiliated researchers.

Observational Networks and Monitoring Campaigns

NARSTO coordinated observational networks linking long-term monitoring from the AirNow network, the National Air Pollution Surveillance program, and Mexican ambient monitoring stations managed by INECC. Intensive campaigns included multi-agency studies such as regional experiments modeled on the North Atlantic Treaty Organization-sponsored programs and linked to satellite overpasses by OMI and instruments on Terra (satellite). Measurement platforms ranged from ground-based sites at research stations like Purdue University and York University to airborne sampling by NASA ER-2 and NOAA WP-3D Orion aircraft, and shipborne studies coordinated with institutions like the Scripps Institution of Oceanography.

Modeling, Data Integration, and Analysis

NARSTO emphasized model intercomparison and data assimilation, fostering collaborative model evaluation among groups at NCAR, EPA, and Lawrence Berkeley National Laboratory. The program championed standardized datasets and metadata practices parallel to initiatives by Global Earth Observation System of Systems and the Group on Earth Observations, and advanced techniques including inverse modeling developed at Massachusetts Institute of Technology and ensemble approaches promoted by the European Centre for Medium-Range Weather Forecasts. Analytical outputs synthesized observational constraints, emissions scenarios informed by Intergovernmental Panel on Climate Change assessments, and health-impact metrics used by public-health researchers at Centers for Disease Control and Prevention and university medical schools.

Key Findings and Scientific Impact

NARSTO produced synthesis reports demonstrating the roles of precursor emissions from sectors represented by agencies such as the Department of Energy and industries tracked by the United States Census Bureau in driving regional ozone episodes. Peer-reviewed work involving scientists from Harvard University, Columbia University, and University of Washington quantified NOx-VOC sensitivity, intercontinental transport documented alongside studies by European Commission-funded teams, and the influence of climate variability researched in collaboration with National Oceanic and Atmospheric Administration scientists. Its assessments influenced modeling best practices adopted by groups at Stanford University and informed risk analyses used in epidemiological studies at Johns Hopkins University.

Implementation, Policy Influence, and Collaborations

Findings from NARSTO informed rulemaking processes at the United States Environmental Protection Agency and policy deliberations within the Commission for Environmental Cooperation and were cited by advisory bodies including the National Academy of Sciences and panels convened by the Environmental Protection Agency Science Advisory Board. The consortium fostered collaborations spanning academic institutions such as University of Michigan, governmental laboratories like Argonne National Laboratory, and international partners including the European Union research networks and programs sponsored by the United Nations Environment Programme. Legacy activities seeded successor efforts in integrated air quality management between Canada and the United States and contributed to capacity building in atmospheric chemistry across North America.

Category:Atmospheric chemistry Category:Air pollution