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| Titel |
Estimates of non-traditional secondary organic aerosols from aircraft SVOC and IVOC emissions using CMAQ |
| VerfasserIn |
M. C. Woody, J. J. West, S. H. Jathar, A. L. Robinson, S. Arunachalam |
| 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. 12 ; Nr. 15, no. 12 (2015-06-25), S.6929-6942 |
| Datensatznummer |
250119850
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| Publikation (Nr.) |
 copernicus.org/acp-15-6929-2015.pdf |
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| Zusammenfassung |
| Utilizing an aircraft-specific parameterization based on smog chamber data in
the Community Multiscale Air Quality (CMAQ) model with the volatility basis
set (VBS), we estimated contributions of non-traditional secondary organic
aerosols (NTSOA) for aircraft emissions during landing and takeoff (LTO)
activities at the Hartsfield–Jackson Atlanta International Airport. NTSOA,
formed from the oxidation of semi-volatile and intermediate volatility
organic compounds (S/IVOCs), is a heretofore unaccounted component of fine
particulate matter (PM2.5) in most air quality models. We expanded a
prerelease version of CMAQ with VBS implemented for the Carbon Bond 2005
(CB05) chemical mechanism to use the Statewide Air Pollution Research Center
2007 (SAPRC-07) chemical mechanism and added species representing aircraft
S/IVOCs and corresponding NTSOA oxidation products. Results indicated that
the maximum monthly average NTSOA contributions occurred at the airport and
ranged from 2.4 ng m−3 (34 % from idle and 66 % from non-idle
aircraft activities) in January to 9.1 ng m−3 (33 and 67 %) in July.
This represents 1.7 % (of 140 ng m−3) in January and 7.4 % in July
(of 122 ng m−3) of aircraft-attributable PM2.5 compared to
41.0–42.0 % from elemental carbon and 42.8–58.0 % from inorganic
aerosols. As a percentage of PM2.5, impacts were higher downwind of the
airport, where NTSOA averaged 4.6–17.9 % of aircraft-attributable
PM2.5 and, considering alternative aging schemes, was as high as
24.0 % – thus indicating the increased contribution of
aircraft-attributable SOA as a component of PM2.5. However, NTSOA
contributions were generally low compared to smog chamber results,
particularly at idle, due to the considerably lower ambient organic aerosol
concentrations in CMAQ compared to those in the smog chamber experiments. |
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