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dc.contributor.authorBrune, W. H.
dc.contributor.authorMiller, D. O.
dc.contributor.authorThames, A. B.
dc.contributor.authorAllen, H. M.
dc.contributor.authorApel, E. C.
dc.contributor.authorBlake, D. R.
dc.contributor.authorBui, T. P.
dc.contributor.authorCommane, R.
dc.contributor.authorCrounse, J. D.
dc.contributor.authorDaube, B. C.
dc.contributor.authorDiskin, G. S.
dc.contributor.authorDiGangi, J. P.
dc.contributor.authorElkins, J. W.
dc.contributor.authorHall, S. R.
dc.contributor.authorHanisco, T. F.
dc.contributor.authorHannun, R. A.
dc.contributor.authorHintsa, E. J.
dc.contributor.authorHornbrook, R. S.
dc.contributor.authorKim, M. J.
dc.contributor.authorMcKain, K.
dc.contributor.authorMoore, F. L.
dc.contributor.authorNeuman, J. A.
dc.contributor.authorNicely, J. M.
dc.contributor.authorPeischl, J.
dc.contributor.authorRyerson, T. B.
dc.contributor.authorClair, Jason St.
dc.contributor.authorSweeney, C.
dc.contributor.authorTeng, A. P.
dc.contributor.authorThompson, C.
dc.contributor.authorUllmann, K.
dc.contributor.authorVeres, P. R.
dc.contributor.authorWennberg, P. O.
dc.contributor.authorWolfe, Glenn
dcterms.creatorhttps://orcid.org/0000-0002-9367-5749en_US
dcterms.creatorhttps://orcid.org/0000-0001-6586-4043en_US
dc.date.accessioned2021-10-13T18:00:50Z
dc.date.available2021-10-13T18:00:50Z
dc.date.issued2019-12-27
dc.description.abstractEarth's atmosphere oxidizes the greenhouse gas methane and other gases, thus determining their lifetimes and oxidation products. Much of this oxidation occurs in the remote, relatively clean free troposphere above the planetary boundary layer, where the oxidation chemistry is thought to be much simpler and better understood than it is in urban regions or forests. The NASA airborne Atmospheric Tomography study (ATom) was designed to produce cross sections of the detailed atmospheric composition in the remote atmosphere over the Pacific and Atlantic Oceans during four seasons. As part of the extensive ATom data set, measurements of the atmosphere's primary oxidant, hydroxyl (OH), and hydroperoxyl (HO₂) are compared to a photochemical box model to test the oxidation chemistry. Generally, observed and modeled median OH and HO₂ agree to within combined uncertainties at the 2σ confidence level, which is ~±40%. For some seasons, this agreement is within ~±20% below 6-km altitude. While this test finds no significant differences, OH observations increasingly exceeded modeled values at altitudes above 8 km, becoming ~35% greater, which is near the combined uncertainties. Measurement uncertainty and possible unknown measurement errors complicate tests for unknown chemistry or incorrect reaction rate coefficients that would substantially affect the OH and HO₂ abundances. Future analysis of detailed comparisons may yield additional discrepancies that are masked in the median values.en_US
dc.description.sponsorshipThis study was supported by the NASA grant NNX15AG59A. This material is based upon work supported by the National Center for Atmospheric Research, which is a major facility sponsored by the National Science Foundation under cooperative agreement 1852977. M.J.K. was supported by NSF fellowship 1524860 for the first year of this study.en_US
dc.description.urihttps://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2019JD031685en_US
dc.format.extent2 filesen_US
dc.genrejournal articlesen_US
dc.identifierdoi:10.13016/m2mebo-gkzt
dc.identifier.citationBrune, W. H. et al.; Exploring Oxidation in the Remote Free Troposphere: Insights From Atmospheric Tomography (ATom); Journal of Geophysical Research : Atmospheres, 125, 1, 27 December, 2019; https://doi.org/10.1029/2019JD031685en_US
dc.identifier.urihttps://doi.org/10.1029/2019JD031685
dc.identifier.urihttp://hdl.handle.net/11603/23087
dc.language.isoen_USen_US
dc.publisherAmerican Geophysical Unionen_US
dc.relation.isAvailableAtThe University of Maryland, Baltimore County (UMBC)
dc.relation.ispartofUMBC Joint Center for Earth Systems Technology
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.en_US
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.titleExploring Oxidation in the Remote Free Troposphere: Insights From Atmospheric Tomography (ATom)en_US
dc.typeTexten_US


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This 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.
Except where otherwise noted, this item's license is described as This 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.