Show simple item record

dc.contributor.authorMiller, Christopher
dc.contributor.authorJacob, Daniel
dc.contributor.authorMarais, Elose
dc.contributor.authorYu, Karen
dc.contributor.authorTravis, Katherine
dc.contributor.authorKim, Patrick S.
dc.contributor.authorFisher, Jenny A.
dc.contributor.authorZhu, Lei
dc.contributor.authorWolfe, Glenn M.
dc.contributor.authorHanisco, Thomas F.
dc.contributor.authorKeutsch, Frank
dc.contributor.authorKaiser, Jennifer
dc.contributor.authorMin, Kyung-Eun
dc.contributor.authorBrown, Steven S.
dc.contributor.authorWashenfelder, Rebecca A.
dc.contributor.authorGonzalez Abad, Gonzalo
dc.contributor.authorChance, Kelly
dc.date.accessioned2019-10-09T13:50:41Z
dc.date.issued2017-07-18
dc.identifier.citationChan Miller, Christopher, Daniel J. Jacob, Eloise A. Marais, Karen Yu, Katherine R. Travis, Patrick S. Kim, Jenny A. Fisher, Lei Zhu, et. al. 2017. Glyoxal Yield From Isoprene Oxidation and Relation to Formaldehyde: Chemical Mechanism, Constraints From SENEX Aircraft Observations, and Interpretation of OMI Satellite Data. Atmospheric Chemistry and Physics 17: 8725–8738.en_US
dc.identifier.issn1680-7324en_US
dc.identifier.urihttp://nrs.harvard.edu/urn-3:HUL.InstRepos:41511219*
dc.description.abstractGlyoxal (CHOCHO) is produced in the atmosphere by the oxidation of volatile organic compounds (VOCs). Like formaldehyde (HCHO), another VOC oxidation product, it is measurable from space by solar backscatter. Isoprene emitted by vegetation is the dominant source of CHOCHO and HCHO in most of the world. We use aircraft observations of CHOCHO and HCHO from the SENEX campaign over the southeast US in summer 2013 to better understand the CHOCHO time-dependent yield from isoprene oxidation, its dependence on nitrogen oxides (NOx  ≡  NO + NO2), the behavior of the CHOCHO–HCHO relationship, the quality of OMI CHOCHO satellite observations, and the implications for using CHOCHO observations from space as constraints on isoprene emissions. We simulate the SENEX and OMI observations with the Goddard Earth Observing System chemical transport model (GEOS-Chem) featuring a new chemical mechanism for CHOCHO formation from isoprene. The mechanism includes prompt CHOCHO formation under low-NOx conditions following the isomerization of the isoprene peroxy radical (ISOPO2). The SENEX observations provide support for this prompt CHOCHO formation pathway, and are generally consistent with the GEOS-Chem mechanism. Boundary layer CHOCHO and HCHO are strongly correlated in the observations and the model, with some departure under low-NOx conditions due to prompt CHOCHO formation. SENEX vertical profiles indicate a free-tropospheric CHOCHO background that is absent from the model. The OMI CHOCHO data provide some support for this free-tropospheric background and show southeast US enhancements consistent with the isoprene source but a factor of 2 too low. Part of this OMI bias is due to excessive surface reflectivities assumed in the retrieval. The OMI CHOCHO and HCHO seasonal data over the southeast US are tightly correlated and provide redundant proxies of isoprene emissions. Higher temporal resolution in future geostationary satellite observations may enable detection of the prompt CHOCHO production under low-NOx conditions apparent in the SENEX data.en_US
dc.description.sponsorshipChemistry and Chemical Biologyen_US
dc.description.sponsorshipEarth and Planetary Sciencesen_US
dc.description.sponsorshipEngineering and Applied Sciencesen_US
dc.language.isoen_USen_US
dc.publisherCopernicus GmbHen_US
dash.licenseLAA
dc.titleGlyoxal Yield From Isoprene Oxidation and Relation to Formaldehyde: Chemical Mechanism, Constraints From SENEX Aircraft Observations, and Interpretation of OMI Satellite Dataen_US
dc.typeJournal Articleen_US
dc.description.versionVersion of Recorden_US
dc.relation.journalAtmospheric Chemistry and Physicsen_US
dash.depositing.authorJacob, Daniel
dc.date.available2019-10-09T13:50:41Z
dash.workflow.commentsFAR2017en_US
dash.funder.nameUS EPA Scienceen_US
dash.funder.award83540601en_US
dc.identifier.doi10.5194/acp-17-8725-2017
dc.source.journalAtmos. Chem. Phys.
dash.source.volume17;14
dash.source.page8725-8738
dash.contributor.affiliatedKaiser, Jennifer
dash.contributor.affiliatedZhu, Lei
dash.contributor.affiliatedGonzalez Abad, Gonzalo
dash.contributor.affiliatedMiller, Christopher
dash.contributor.affiliatedMarais, Elose
dash.contributor.affiliatedTravis, Katherine
dash.contributor.affiliatedChance, Kelly
dash.contributor.affiliatedKeutsch, Frank
dash.contributor.affiliatedJacob, Daniel
dc.identifier.orcid0000-0002-6373-3100


Files in this item

Thumbnail

This item appears in the following Collection(s)

Show simple item record