1. Springtime high surface ozone events over the western United States: Quantifying the role of stratospheric intrusions Lin, Meiyun; Fiore, Arlene M.; Cooper, Owen R.; Horowitz, Larry W.; Langford, Andrew O.; Levy II, Hiram; Johnson, Bryan J.; Naik, Vaishali; Oltmans, Samuel J.; Senff, Christoph J. 2012 Articles Stratospheric circulationAir quality managementAtmospheric chemistry--Mathematical modelsMeteorologyClimatic changes