Composition of clean marine air and biogenic influences on VOCs during the MUMBA campaign

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dc.contributor.authorGuérette, ÉAen_AU
dc.contributor.authorPaton-Walsh, Cen_AU
dc.contributor.authorGalbally, IEen_AU
dc.contributor.authorMolloy, SBen_AU
dc.contributor.authorLawson, Sen_AU
dc.contributor.authorKubistin, Den_AU
dc.contributor.authorBuchholz, Ren_AU
dc.contributor.authorGriffith, DWTen_AU
dc.contributor.authorLangenfelds, RLen_AU
dc.contributor.authorKrummel, PBen_AU
dc.contributor.authorLoh, Zen_AU
dc.contributor.authorChambers, SDen_AU
dc.contributor.authorGriffiths, ADen_AU
dc.contributor.authorKeywood, MDen_AU
dc.contributor.authorSelleck, PWen_AU
dc.contributor.authorDorminick, Den_AU
dc.contributor.authorHumphries, Ren_AU
dc.contributor.authorWilson, SRen_AU
dc.date.accessioned2020-06-15T00:15:52Zen_AU
dc.date.available2020-06-15T00:15:52Zen_AU
dc.date.issued2019-07-10en_AU
dc.date.statistics2020-06-01en_AU
dc.description.abstractVolatile organic compounds (VOCs) are important precursors to the formation of ozone and fine particulate matter, the two pollutants of most concern in Sydney, Australia. Despite this importance, there are very few published measurements of ambient VOC concentrations in Australia. In this paper, we present mole fractions of several important VOCs measured during the campaign known as MUMBA (Measurements of Urban, Marine and Biogenic Air) in the Australian city of Wollongong (34°S). We particularly focus on measurements made during periods when clean marine air impacted the measurement site and on VOCs of biogenic origin. Typical unpolluted marine air mole fractions during austral summer 2012-2013 at latitude 34°S were established for CO2 (391.0 ± 0.6 ppm), CH4 (1760.1 ± 0.4 ppb), N2O (325.04 ± 0.08 ppb), CO (52.4 ± 1.7 ppb), O3 (20.5 ± 1.1 ppb), acetaldehyde (190 ± 40 ppt), acetone (260 ± 30 ppt), dimethyl sulphide (50 ± 10 ppt), benzene (20 ± 10 ppt), toluene (30 ± 20 ppt), C8H10 aromatics (23 ± 6 ppt) and C9H12 aromatics (36 ± 7 ppt). The MUMBA site was frequently influenced by VOCs of biogenic origin from a nearby strip of forested parkland to the east due to the dominant north-easterly afternoon sea breeze. VOCs from the more distant densely forested escarpment to the west also impacted the site, especially during two days of extreme heat and strong westerly winds. The relative amounts of different biogenic VOCs observed for these two biomes differed, with much larger increases of isoprene than of monoterpenes or methanol during the hot westerly winds from the escarpment than with cooler winds from the east. However, whether this was due to different vegetation types or was solely the result of the extreme temperatures is not entirely clear. We conclude that the clean marine air and biogenic signatures measured during the MUMBA campaign provide useful information about the typical abundance of several key VOCs and can be used to constrain chemical transport model simulations of the atmosphere in this poorly sampled region of the world. © 2019 The Authorsen_AU
dc.identifier.citationGuérette, É. A., Paton-Walsh, C., Galbally, I., Molloy, S., Lawson, S., Kubistin, D., Buchholz, R., Griffith, D. W., Langenfelds, R. L., Krummel, P. B., Loh, Z., Chambers, S., Griffiths, A., Keywood, M., Selleck, P., Dominick, D., Humphries, R., & Wilson, S.R. (2019). Composition of clean marine air and biogenic influences on VOCs during the MUMBA campaign. Atmosphere, 10(7), 383. MDPI AG. doi:10.3390/atmos10070383en_AU
dc.identifier.govdoc9678en_AU
dc.identifier.issn2073-4433en_AU
dc.identifier.issue7en_AU
dc.identifier.journaltitleAtmosphereen_AU
dc.identifier.pagination383en_AU
dc.identifier.urihttps://doi.org/10.3390/atmos10070383en_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/9650en_AU
dc.identifier.volume10en_AU
dc.language.isoenen_AU
dc.publisherMDPI AGen_AU
dc.subjectVolatile matteren_AU
dc.subjectAir qualityen_AU
dc.subjectEnvironmental qualityen_AU
dc.subjectOzoneen_AU
dc.subjectParticulatesen_AU
dc.subjectAir pollutionen_AU
dc.subjectNew South Walesen_AU
dc.subjectAustraliaen_AU
dc.subjectMonitoringen_AU
dc.subjectAerosolsen_AU
dc.titleComposition of clean marine air and biogenic influences on VOCs during the MUMBA campaignen_AU
dc.typeJournal Articleen_AU
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