Can Column Formaldehyde Observations Inform Air Quality Monitoring Strategies for Ozone and Related Photochemical Oxidants?

dc.contributor.authorTravis, K. R.en
dc.contributor.authorJudd, L. M.en
dc.contributor.authorCrawford, J. H.en
dc.contributor.authorChen, Gaoen
dc.contributor.authorSzykman, Jamesen
dc.contributor.authorWhitehill, Andrewen
dc.contributor.authorValin, Lukas C.en
dc.contributor.authorSpinei, Elenaen
dc.contributor.authorJanz, Scotten
dc.contributor.authorNowlan, Caroline R.en
dc.contributor.authorKwon, Hyeong-Ahnen
dc.contributor.authorFried, Alanen
dc.contributor.authorWalega, Jamesen
dc.description.abstractFormaldehyde column density (omega HCHO) showed a potentially useful correlation with surface ozone during the LISTOS campaign on Long Island Sound and the KORUS-AQ campaign in Seoul, South Korea. This builds on previous work that identified this relationship from in situ aircraft observations with similar findings for ground-based and airborne remote sensing of omega HCHO. In the Long Island Sound region, omega HCHO and surface ozone exhibited strong temporal (r(2) = 0.66) and spatial (r(2) = 0.73) correlation. The temporal variability in omega HCHO (similar to 1 Dobson units [DU]) was larger than the range in the spatial average (similar to 0.1 DU). The spatial average is most useful for informing ozone monitoring strategies, demonstrating the challenge in using omega HCHO satellite data sets for this purpose. In Seoul, high levels of NO2 resulted in O-x better correlating with omega HCHO than surface ozone due to titration effects. The omega HCHO-O-x relationship may therefore reflect the sum of surface ozone and related photochemical oxidants, relevant to air quality standards set to regulate this quantity such as the U.S. EPA National Ambient Air Quality Standard (NAAQS). The relationship of omega HCHO to O-x shifted in Seoul during the campaign demonstrating the need to evaluate this relationship over longer time periods. With sufficient precision in future satellite retrievals, omega HCHO observations could be useful for evaluating the adequacy of surface air quality monitoring strategies.en
dc.description.notesThe LISTOS airborne measurements would not have been possible without the support of the NASA Geostationary Coastal and Air Pollution Events (GEO-CAPE) mission study as well as the NASA Earth Science Division (ESD) Tropospheric Composition Program. We express gratitude to the entire LISTOS and KORUS-AQ science teams for their expertise, research, and measurement contributions toward the successful collaborative field study. We acknowledge Paul Wennberg for the use of his HNO<INF>3</INF> data from the CIT-CIMS, Greg Huey for the use of his PAN data from the GT-CIMS during KORUS-AQ, Sam Hall for the use of his photolysis frequency data from the CAFS instrument, and Bill Brune for the use of his OH data from the ATHOS instrument. The views expressed in this article are those of the authors and do not necessarily represent the views or policies of the U.S. Environmental Protection Agency. Any mention of trade names, manufacturers or products does not imply an endorsement by the United States Government or the U.S. Environmental Protection Agency. EPA and its employees do not endorse any commercial products, services, or enterprises.en
dc.description.sponsorshipNASA Geostationary Coastal and Air Pollution Events (GEO-CAPE); NASA Earth Science Division (ESD) Tropospheric Composition Programen
dc.description.versionPublished versionen
dc.publisherAmerican Geophysical Unionen
dc.rightsCreative Commons Attribution-NonCommercial-NoDerivatives 4.0 Internationalen
dc.subjectair qualityen
dc.titleCan Column Formaldehyde Observations Inform Air Quality Monitoring Strategies for Ozone and Related Photochemical Oxidants?en
dc.title.serialJournal of Geophysical Research-Atmospheresen
dc.typeArticle - Refereeden


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