Observations of glyoxal and formaldehyde as metrics for the anthropogenic impact on rural photochemistry

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dc.contributor.authorDiGangi, J. P.
dc.contributor.authorHenry, S. B.
dc.contributor.authorKammrath, A.
dc.contributor.authorBoyle, E. S.
dc.contributor.authorKaser, L.
dc.contributor.authorSchnitzhofer, R.
dc.contributor.authorGraus, M.
dc.contributor.authorTurnipseed, A.
dc.contributor.authorPark, J. H.
dc.contributor.authorWeber, R. J.
dc.contributor.authorHornbrook, R. S.
dc.contributor.authorCantrell, C. A.
dc.contributor.authorMaudlin III, R. L.
dc.contributor.authorKim, S.
dc.contributor.authorNakashima, Y.
dc.contributor.authorWolfe, G. M.
dc.contributor.authorKajii, Y.
dc.contributor.authorApel, E.C.
dc.contributor.authorGoldstein, A. H.
dc.contributor.authorGuenther, A.
dc.contributor.authorKarl, T.
dc.contributor.authorHansel, A.
dc.contributor.authorKeutsch, F. N.
dc.date.accessioned2020-09-16T19:01:36Z
dc.date.available2020-09-16T19:01:36Z
dc.date.issued2012-10-22
dc.description.abstractWe present simultaneous fast, in-situ measurements of formaldehyde and glyoxal from two rural campaigns, BEARPEX 2009 and BEACHON-ROCS, both located in Pinus Ponderosa forests with emissions dominated by biogenic volatile organic compounds (VOCs). Despite considerable variability in the formaldehyde and glyoxal concentrations, the ratio of glyoxal to formaldehyde, RGF, displayed a very regular diurnal cycle over nearly 2 weeks of measurements. The only deviations in RGF were toward higher values and were the result of a biomass burning event during BEARPEX 2009 and very fresh anthropogenic influence during BEACHON-ROCS. Other rapid changes in glyoxal and formaldehyde concentrations have hardly any affect on RGF and could reflect transitions between low and high NO regimes. The trend of increased RGF from both anthropogenic reactive VOC mixtures and biomass burning compared to biogenic reactive VOC mixtures is robust due to the short timescales over which the observed changes in RGF occurred. Satellite retrievals, which suggest higher RGF for biogenic areas, are in contrast to our observed trends. It remains important to address this discrepancy, especially in view of the importance of satellite retrievals and in situ measurements for model comparison. In addition, we propose that RGF represents a useful metric for biogenic or anthropogenic reactive VOC mixtures and, in combination with absolute concentrations of glyoxal and formaldehyde, furthermore represents a useful metric for the extent of anthropogenic influence on overall reactive VOC processing via NOx. In particular, RGF yields information about not simply the VOCs dominating reactivity in an airmass, but the VOC processing itself that is directly coupled to ozone and secondary organic aerosolen_US
dc.description.sponsorshipThe authors thank the National Science Foundation (ATM 0852406), the NCAR BEACHON project, NASA-SBIR Phase I & II, Austrian Science Fund (FWF): [L518], and the Camille and Henry Dreyfus Foundation for support. We would also like to thank Rainer Volkamer, Jose Garc ´ ´ıa, Rebecca Washenfelder, Cora Young, Catalina Tsai, Jochen Stutz, Folkard ¨ Wittrock, and Andreas Richter for sharing data and for useful discussions. NCAR is sponsored by the National Science Foundation. Lisa Kaser is a recipient of a DOC-fFORTE-fellowship of the Austrian Academy of Sciences at the Institute of Ion Physics and Applied Physics.en_US
dc.description.urihttps://acp.copernicus.org/articles/12/9529/2012/en_US
dc.format.extent15 pagesen_US
dc.genrejournal articlesen_US
dc.identifierdoi:10.13016/m2j49f-gzfh
dc.identifier.citationDiGangi, J. P., Henry, S. B., Kammrath, A., Boyle, E. S., Kaser, L., Schnitzhofer, R., Graus, M., Turnipseed, A., Park, J.-H., Weber, R. J., Hornbrook, R. S., Cantrell, C. A., Maudlin III, R. L., Kim, S., Nakashima, Y., Wolfe, G. M., Kajii, Y., Apel, E. C., Goldstein, A. H., Guenther, A., Karl, T., Hansel, A., and Keutsch, F. N.: Observations of glyoxal and formaldehyde as metrics for the anthropogenic impact on rural photochemistry, Atmos. Chem. Phys., 12, 9529–9543, https://doi.org/10.5194/acp-12-9529-2012, 2012.en_US
dc.identifier.urihttps://doi.org/10.5194/acp-12-9529-2012
dc.identifier.urihttp://hdl.handle.net/11603/19669
dc.language.isoen_USen_US
dc.publisherCopernicusen_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.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.titleObservations of glyoxal and formaldehyde as metrics for the anthropogenic impact on rural photochemistryen_US
dc.typeTexten_US

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