Decadal changes in summertime reactive oxidized nitrogen and surface ozone over the Southeast United States

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dc.contributor.authorLi, Jingyi
dc.contributor.authorMao, Jingqiu
dc.contributor.authorFiore, Arlene M.
dc.contributor.authorCohen, Ronald C.
dc.contributor.authorCrounse, John D.
dc.contributor.authorTeng, Alex P.
dc.contributor.authorWennberg, Paul O.
dc.contributor.authorLee, Ben H.
dc.contributor.authorLopez-Hilfiker, Felipe D.
dc.contributor.authorThornton, Joel A.
dc.contributor.authorPeischl, Jeff
dc.contributor.authorPollack, Ilana B.
dc.contributor.authorRyerson, Thomas B.
dc.contributor.authorVeres, Patrick
dc.contributor.authorRoberts, James M.
dc.contributor.authorNeuman, J. Andrew
dc.contributor.authorNowak, John B.
dc.contributor.authorWolfe, Glenn M.
dc.contributor.authorHanisco, Thomas F.
dc.contributor.authorFried, Alan
dc.contributor.authorSingh, Hanwant B.
dc.contributor.authorDibb, Jack
dc.contributor.authorPaulot, Fabien
dc.contributor.authorHorowitz, Larry W.
dc.date.accessioned2020-09-18T17:12:00Z
dc.date.available2020-09-18T17:12:00Z
dc.date.issued2018-02-16
dc.description.abstractWidespread efforts to abate ozone (O₃) smog have significantly reduced emissions of nitrogen oxides (NOx) over the past 2 decades in the Southeast US, a place heavily influenced by both anthropogenic and biogenic emissions. How reactive nitrogen speciation responds to the reduction in NOx emissions in this region remains to be elucidated. Here we exploit aircraft measurements from ICARTT (July–August 2004), SENEX (June–July 2013), and SEAC4RS (August–September 2013) and long-term ground measurement networks alongside a global chemistry–climate model to examine decadal changes in summertime reactive oxidized nitrogen (RON) and ozone over the Southeast US. We show that our model can reproduce the mean vertical profiles of major RON species and the total (NOy) in both 2004 and 2013. Among the major RON species, nitric acid (HNO₃) is dominant (∼ 42–45 %), followed by NOx (31 %), total peroxy nitrates (ΣPNs; 14 %), and total alkyl nitrates (ΣANs; 9–12 %) on a regional scale. We find that most RON species, including NOx, ΣPNs, and HNO₃, decline proportionally with decreasing NOx emissions in this region, leading to a similar decline in NOy. This linear response might be in part due to the nearly constant summertime supply of biogenic VOC emissions in this region. Our model captures the observed relative change in RON and surface ozone from 2004 to 2013. Model sensitivity tests indicate that further reductions of NOx emissions will lead to a continued decline in surface ozone and less frequent high-ozone events.en_US
dc.description.sponsorshipThe authors thank Vaishali Naik (NOAA GFDL) for providing emission inventories in the GFDL AM3 model and Leo Donner (NOAA GFDL) and William Cooke (UCAR/NOAA) for help with the convection scheme of AM3. Jingyi Li, Jingqiu Mao, and Larry W. Horowitz acknowledge support from the NOAA Climate Program Office under grant no. NA13OAR431007. Jingqiu Mao, Larry W. Horowitz, and Arlene M. Fiore acknowledge support from the NOAA Climate Program Office under grant no.NA14OAR4310133. John D. Crounse and Paul O. Wennberg acknowledge support from NASA grants (NNX12AC06G and NNX14AP46G). Jingyi Li acknowledges support from the Startup Foundation for Introducing Talent of NUIST grant no. 2243141701014 and the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD).en_US
dc.description.urihttps://acp.copernicus.org/articles/18/2341/2018/en_US
dc.format.extent21 pagesen_US
dc.genrejournal articlesen_US
dc.identifierdoi:10.13016/m2f4e9-wbvu
dc.identifier.citationLi, J., Mao, J., Fiore, A. M., Cohen, R. C., Crounse, J. D., Teng, A. P., Wennberg, P. O., Lee, B. H., Lopez-Hilfiker, F. D., Thornton, J. A., Peischl, J., Pollack, I. B., Ryerson, T. B., Veres, P., Roberts, J. M., Neuman, J. A., Nowak, J. B., Wolfe, G. M., Hanisco, T. F., Fried, A., Singh, H. B., Dibb, J., Paulot, F., and Horowitz, L. W.: Decadal changes in summertime reactive oxidized nitrogen and surface ozone over the Southeast United States, Atmos. Chem. Phys., 18, 2341–2361, https://doi.org/10.5194/acp-18-2341-2018, 2018.en_US
dc.identifier.urihttps://doi.org/10.5194/acp-18-2341-2018
dc.identifier.urihttp://hdl.handle.net/11603/19687
dc.language.isoen_USen_US
dc.publisherCopernicus Publicationsen_US
dc.relation.isAvailableAtThe University of Maryland, Baltimore County (UMBC)
dc.relation.ispartofUMBC Joint Center for Earth Systems Technology
dc.relation.ispartofUMBC Physics Department
dc.relation.ispartofUMBC Faculty Collection
dc.rightsThis item is likely protected under Title 17 of the U.S. Copyright Law. Unless on a Creative Commons license, for uses protected by Copyright Law, contact the copyright holder or the author.
dc.rightsPublic Domain Mark 1.0*
dc.rightsThis work was written as part of one of the author's official duties as an Employee of the United States Government and is therefore a work of the United States Government. In accordance with 17 U.S.C. 105, no copyright protection is available for such works under U.S. Law.
dc.rights.urihttp://creativecommons.org/publicdomain/mark/1.0/*
dc.titleDecadal changes in summertime reactive oxidized nitrogen and surface ozone over the Southeast United Statesen_US
dc.typeTexten_US

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