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| Titel |
VOC Source - Receptor Relationships in Houston during TexAQS-II |
| VerfasserIn |
M. Leuchner, B. Rappenglück |
| Konferenz |
EGU General Assembly 2009
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 11 (2009) |
| Datensatznummer |
250021669
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| Zusammenfassung |
| During the TexAQS-II field campaign in August and September 2006, C2 – C10 volatile
organic compounds (VOC) were measured continuously and online at the urban Moody
Tower (MT) site. This data set was compared to corresponding VOC data sets obtained at six
sites located in the highly industrialized Houston Ship Channel area (HSC). Receptor
modeling was performed by positive matrix factorization (PMF) at all sites. Conditional
probability functions were used to determine the origin of the polluted air masses in the
Houston area. A subdivision into daytime and nighttime was carried out to discriminate
photochemical influences. Eight main source categories of industrial, mobile, and biogenic
emissions were identified at the urban receptor site, seven and six, respectively, at the
different HSC sites. Amongst these categories, natural gas / crude oil, LPG, and
vehicular exhaust contributed most to the total measured VOC mass, followed by fuel
evaporation, aromatics, petrochemical sources from ethylene and propylene, and biogenic
sources. Based on PMF analyses of different wind sectors, the total VOC mass was
estimated to be twofold at MT with wind directions from HSC compared to air from a
typical urban sector, for petrochemical compounds more than threefold. Despite
the strong impact of air masses influenced by industrial sources at HSC, still a
significant fraction of the total mass contributions at MT can be apportioned to other
sources, mainly motor vehicles and aromatic solvents. The investigation of diurnal
variation in combination with wind directional frequencies revealed the greatest
HSC impact at the urban site during the morning, and the least during the evening. |
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