Reassessing the ratio of glyoxal to formaldehyde as an indicator of hydrocarbon precursor speciation

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dc.contributor.authorKaiser, J.
dc.contributor.authorWolfe, G. M.
dc.contributor.authorMin, K.E.
dc.contributor.authorBrown, S. S.
dc.contributor.authorMiller, C. C.
dc.contributor.authorJacob, D. J.
dc.contributor.authorGouw, J. A.
dc.contributor.authorGraus, M.
dc.contributor.authorHanisco, T. F.
dc.contributor.authorHolloway, J.
dc.contributor.authorPeischl, J.
dc.contributor.authorPollack, I. B.
dc.contributor.authorRyerson, T. B.
dc.contributor.authorWarneke, C.
dc.contributor.authorWashenfelder, R. A.
dc.contributor.authorKeutsch, F. N.
dc.date.accessioned2020-09-17T17:58:03Z
dc.date.available2020-09-17T17:58:03Z
dc.date.issued2015-07-13
dc.description.abstractThe yield of formaldehyde (HCHO) and glyoxal (CHOCHO) from oxidation of volatile organic compounds (VOCs) depends on precursor VOC structure and the concentration of NOx (NOx = NO + NO2). Previous work has proposed that the ratio of CHOCHO to HCHO (RGF) can be used as an indicator of precursor VOC speciation, and absolute concentrations of the CHOCHO and HCHO as indicators of NOx. Because this metric is measurable by satellite, it is potentially useful on a global scale; however, absolute values and trends in RGF have differed between satellite and ground-based observations. To investigate potential causes of previous discrepancies and the usefulness of this ratio, we present measurements of CHOCHO and HCHO over the southeastern United States (SE US) from the 2013 SENEX (Southeast Nexus) flight campaign, and compare these measurements with OMI (Ozone Monitoring Instrument) satellite retrievals. High time-resolution flight measurements show that high RGF is associated with monoterpene emissions, low RGF is associated with isoprene oxidation, and emissions associated with oil and gas production can lead to small-scale variation in regional RGF. During the summertime in the SE US, RGF is not a reliable diagnostic of anthropogenic VOC emissions, as HCHO and CHOCHO production are dominated by isoprene oxidation. Our results show that the new CHOCHO retrieval algorithm reduces the previous disagreement between satellite and in situ RGF observations. As the absolute values and trends in RGF observed during SENEX are largely reproduced by OMI observations, we conclude that satellite-based observations of RGF can be used alongside knowledge of land use as a global diagnostic of dominant hydrocarbon speciation.en_US
dc.description.sponsorships. The authors would like to acknowledge the contribution from all members of the SENEX flight and science teams. Funding was provided by US EPA Science to Achieve Results (STAR) program grant 83540601. This research has not been subjected to any EPA review and therefore does not necessarily reflect the views of the agency, and no official endorsement should be inferred. J. Kaiser acknowledges support from NASA Headquarters under the NASA Earth and Space Science Fellowship Program – grant NNX14AK97H. This work was also supported as part of the NASA Aura Science Team.en_US
dc.description.urihttps://acp.copernicus.org/articles/15/7571/2015/en_US
dc.format.extent13 pagesen_US
dc.genrejournal articlesen_US
dc.identifierdoi:10.13016/m20atn-umvt
dc.identifier.citationKaiser, J., Wolfe, G. M., Min, K. E., Brown, S. S., Miller, C. C., Jacob, D. J., deGouw, J. A., Graus, M., Hanisco, T. F., Holloway, J., Peischl, J., Pollack, I. B., Ryerson, T. B., Warneke, C., Washenfelder, R. A., and Keutsch, F. N.: Reassessing the ratio of glyoxal to formaldehyde as an indicator of hydrocarbon precursor speciation, Atmos. Chem. Phys., 15, 7571–7583, https://doi.org/10.5194/acp-15-7571-2015, 2015.en_US
dc.identifier.urihttps://doi.org/10.5194/acp-15-7571-2015
dc.identifier.urihttp://hdl.handle.net/11603/19678
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.titleReassessing the ratio of glyoxal to formaldehyde as an indicator of hydrocarbon precursor speciationen_US
dc.typeTexten_US

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