Science Source
Lin, Meiyun, Horowitz, Larry W., Payton, Richard, Fiore, Arlene M., Tonnesen, Gail
Atmospheric Chemistry and Physics
Published date March 1, 2017
Atmospheric Chemistry and Physics
Published date March 1, 2017
US surface ozone trends and extremes from 1980 to 2014: quantifying the roles of rising Asian emissions, domestic controls, wildfires, and climate
- States that US surface ozone (O3) responds to varying global-to-regional precursor emissions, climate, and extreme weather, with implications for designing effective air quality control policies
- Examines these conjoined processes with observations and global chemistry-climate model hindcasts over 1980–2014
- Finds that Asian emissions of nitrogen oxides (NOx) have tripled since 1990, contributing as much as 65 % to modeled springtime background O3 increases (0.3–0.5 ppb yr−1) over the western US (WUS), outpacing O3 decreases attained via 50 % US NOx emission controls
- Finds that during summer, increasing Asian emissions roughly offset the benefits of US emission reductions
- Concludes that high temperatures and the associated buildup of O3 produced from regional anthropogenic emissions contribute most to elevating observed summertime O3 throughout the USA
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