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| Titel |
Glyoxal and Formaldehyde as a Metric for Airmass Characterization |
| VerfasserIn |
Kate Skog, Philip Feiner, Li Zhang, Robert Wild, Kevin Olson, Abigail Koss, Karsten Baumann, Eric Edgerton, William Brune, Steven Brown, Joost de Gouw, Allen Goldstein, Frank Keutsch |
| Konferenz |
EGU General Assembly 2015
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 17 (2015) |
| Datensatznummer |
250107671
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| Publikation (Nr.) |
 EGU/EGU2015-7383.pdf |
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| Zusammenfassung |
| A number of studies have suggested that observations of glyoxal, formaldehyde, and the ratio
between the two (RGF) can help define the composition of an airmass in terms of volatile
organic compound (VOC), HOx, and NOx. The exact relationships, and therefore potential
usefulness of the ratio, remain unclear due to limited in-situ measurements. Glyoxal and
formaldehyde were measured at the Centreville, AL site as part of the 2013 Sothern Oxidant
and Aerosol Study (SOAS). At this biogenically influenced site glyoxal correlated well with
formaldehyde (R2=0.71) with an RGF value of 1.4% despite stronger variation in glyoxal and
formaldehyde concentrations. Further sensitivity testing shows that changes in RGF based on
VOC composition are more strongly affected by how much formaldehyde changes
than by how much glyoxal changes and confirms a trend of higher RGF values
associated with anthropogenic VOCs. However, unlike isoprene, monoterpenes
have an affect on RGF similar to that of some anthropogenic VOCs. Sensitivity
testing also confirms previously seen relationships of RGF with OH, NO, and NO2. |
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