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| Titel |
Incremental Reactivity Effects on Secondary Organic Aerosol Formation in Urban Atmospheres with and without Biogenic Influence |
| VerfasserIn |
Mary Kacarab, Lijie Li, William P. L. Carter, David R. Cocker III |
| Konferenz |
EGU General Assembly 2016
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 18 (2016) |
| Datensatznummer |
250130897
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| Publikation (Nr.) |
 EGU/EGU2016-11224.pdf |
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| Zusammenfassung |
| Two different surrogate mixtures of anthropogenic and biogenic volatile organic compounds
(VOCs) were developed to study secondary organic aerosol (SOA) formation at atmospheric
reactivities similar to urban regions with varying biogenic influence levels. Environmental
chamber simulations were designed to enable the study of the incremental aerosol formation
from select anthropogenic (m−Xylene, 1,2,4-Trimethylbenzene, and 1-Methylnaphthalene)
and biogenic (α-pinene) precursors under the chemical reactivity set by the two
different surrogate mixtures. The surrogate reactive organic gas (ROG) mixtures were
based on that used to develop the maximum incremental reactivity (MIR) factors
for evaluation of O3 forming potential. Multiple incremental aerosol formation
experiments were performed in the University of California Riverside (UCR) College of
Engineering Center for Environmental Research and Technology (CE-CERT) dual
90m3 environmental chambers. Incremental aerosol yields were determined for
each of the VOCs studied and compared to yields found from single precursor
studies. Aerosol physical properties of density, volatility, and hygroscopicity were
monitored throughout experiments. Bulk elemental chemical composition from
high-resolution time of flight aerosol mass spectrometer (HR-ToF-AMS) data will also be
presented. Incremental yields and SOA chemical and physical characteristics will be
compared with data from previous single VOC studies conducted for these aerosol
precursors following traditional VOC/NOx chamber experiments. Evaluation of the
incremental effects of VOCs on SOA formation and properties are paramount in
evaluating how to best extrapolate environmental chamber observations to the ambient
atmosphere and provides useful insights into current SOA formation models. Further, the
comparison of incremental SOA from VOCs in varying surrogate urban atmospheres
(with and without strong biogenic influence) allows for a unique perspective on the
impacts different compounds have on aerosol formation in different urban regions. |
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