Changes in the relative importance of biogenic isoprene and Soil NOx emissions on ozone concentrations in nonattainment areas of the United States
Date
2022-07-16
Authors
Geddes, Jeffrey A.
Pusede, Sally E.
Wong, Anthony YH.
Version
Published version
OA Version
Citation
J.A. Geddes, S.E. Pusede, A.Y.H. Wong. 2022. "Changes in the Relative Importance of Biogenic Isoprene and Soil NOx Emissions on Ozone Concentrations in Nonattainment Areas of the United States" Journal of Geophysical Research: Atmospheres, Volume 127, Issue 13. https://doi.org/10.1029/2021jd036361
Abstract
Reductions in anthropogenic emissions have drawn increasing attention to the role of the biosphere in O3 production chemistry in U.S. cities. We report the results of chemical transport model sensitivity simulations exploring the relative impacts of biogenic isoprene and soil nitrogen oxides (NOx) emissions on O3 and its temporal variability. We compare scenarios with high and low anthropogenic NOx emissions representing the reductions that have occurred in recent decades. As expected, summertime O3 concentrations become less sensitive to perturbations in biogenic isoprene emissions as anthropogenic NOx emissions decline. However, we demonstrate for the first time that across policy relevant O3 nonattainment areas of the United States, O3 becomes more sensitive to perturbations in soil NOx emissions than to identical perturbations in isoprene emissions. We show that interannual variability in soil NOx emissions may now have larger impacts on interannual O3 variability than isoprene emissions in many areas where the latter would have dominated in the recent past.
Description
License
© 2022. The Authors. This is an open access article under the terms of the Creative Commons Attribution-NonCommercial NoDerivs License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non-commercial and no modifications or adaptations are made.