Influences of Stratospheric Ozone and Long-range Transport on Background Surface Ozone for Air Pollution Management

Project: Research

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During the last few decades, the chemical composition of the atmosphere hassignificantly changed due to anthropogenic influences. Photochemical smog (a by-product ofindustrialization), produces ozone air pollution which has become a serious health-relatedproblem in urban environments. It is clear that local emissions (i.e., NOx and VOCs) are notthe only source that contributes to local ozone problems. Other source candidates, such aslong-range transported air pollutants, stratospheric ozone intrusion and lightning emissionsmay also play an important role in local air pollution. Creating a better remedy for local andregional ozone problems, makes it necessary to quantify the contribution of ozone pollutionfrom these natural and anthropogenic processes.In this proposal, the GEOS-Chem global chemical transport model coupled with the WRFCMAQair quality modelling system will be used to study the effects of long-range transporton regional air quality in East Asia. The use of a multi-emission scenarios approach providesa unique method to study the impact of long-range transport from each of the individualcontinents (i.e., North America, Europe and East Asia). In addition, the Policy RelevantBackground (PRB) ozone produced from one of the scenarios can be used to assist futureozone policymaking, determining the best achievable ozone air quality. To increase ourunderstanding of the composition of ground level ozone, a pioneer attempt using a regionalair quality model for studying the Stratospheric Tropospheric Exchange (STE) will beperformed. The use of chemical downscaling with the Tropopause Determining Algorithm(TDA) makes it feasible to study the influence of STE on ground level ozone using CMAQ.Geospatial and seasonal variations of STE contribution to the ground will be determined.This is one of the early research studies that utilize a high-resolution air quality model toinvestigate the spatial impact of ozone from STE on air quality.The assessment of the composition of ground level ozone using a regional air quality modelwill be carried out in this study. Success of the proposed research will lead to a betterunderstanding of how long-range transport and stratospheric ozone affect our regional ozoneair quality.


Project number9048013
Grant typeECS
Effective start/end date1/10/1431/07/19

    Research areas

  • background ozone,PRB ozone,long-range transport,regional air quality,