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| Titel |
Multiday production of condensing organic aerosol mass in urban and forest outflow |
| VerfasserIn |
J. Lee-Taylor, A. Hodzic, S. Madronich, B. Aumont, M. Camredon, R. Valorso |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 15, no. 2 ; Nr. 15, no. 2 (2015-01-16), S.595-615 |
| Datensatznummer |
250119328
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| Publikation (Nr.) |
 copernicus.org/acp-15-595-2015.pdf |
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| Zusammenfassung |
| Secondary organic aerosol (SOA) production in air masses containing either
anthropogenic or biogenic (terpene-dominated) emissions is investigated using
the explicit gas-phase chemical mechanism generator GECKO-A. Simulations show
several-fold increases in SOA mass continuing for multiple days in the urban
outflow, even as the initial air parcel is diluted into the regional
atmosphere. The SOA mass increase in the forest outflow is more modest
(~50%) and of shorter duration (1–2 days). The multiday production
in the urban outflow stems from continuing oxidation of gas-phase precursors
which persist in equilibrium with the particle phase, and can be attributed
to multigenerational reaction products of both aromatics and alkanes,
especially those with relatively low carbon numbers (C4–15). In particular
we find large contributions from substituted maleic anhydrides and
multi-substituted peroxide-bicyclic alkenes. The results show that the
predicted production is a robust feature of our model even under changing
atmospheric conditions and different vapor pressure schemes, and contradict
the notion that SOA undergoes little mass production beyond a short initial
formation period. The results imply that anthropogenic aerosol precursors
could influence the chemical and radiative characteristics of the atmosphere
over an extremely wide region, and that SOA measurements near precursor
sources may routinely underestimate this influence. |
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