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| Titel |
Comparison of chemical characteristics of 495 biomass burning plumes intercepted by the NASA DC-8 aircraft during the ARCTAS/CARB-2008 field campaign |
| VerfasserIn |
A. Hecobian, Z. Liu, C. J. Hennigan, L. G. Huey, J. L. Jimenez, M. J. Cubison, S. Vay, G. S. Diskin, G. W. Sachse, A. Wisthaler, T. Mikoviny, A. J. Weinheimer, J. Liao, D. J. Knapp, P. O. Wennberg, A. Kürten, J. D. Crounse, J. St. Clair, Y. Wang, R. J. Weber |
| 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 ; 11, no. 24 ; Nr. 11, no. 24 (2011-12-22), S.13325-13337 |
| Datensatznummer |
250010305
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| Publikation (Nr.) |
 copernicus.org/acp-11-13325-2011.pdf |
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| Zusammenfassung |
This paper compares measurements of gaseous and particulate emissions from a
wide range of biomass-burning plumes intercepted by the NASA DC-8 research
aircraft during the three phases of the ARCTAS-2008 experiment: ARCTAS-A,
based out of Fairbanks, Alaska, USA (3 April to 19 April 2008); ARCTAS-B
based out of Cold Lake, Alberta, Canada (29 June to 13 July 2008); and
ARCTAS-CARB, based out of Palmdale, California, USA (18 June to 24 June
2008). Approximately 500 smoke plumes from biomass burning emissions that
varied in age from minutes to days were segregated by fire source region and
urban emission influences. The normalized excess mixing ratios (NEMR) of
gaseous (carbon dioxide, acetonitrile, hydrogen cyanide, toluene, benzene,
methane, oxides of nitrogen and ozone) and fine aerosol particulate
components (nitrate, sulfate, ammonium, chloride, organic aerosols and water
soluble organic carbon) of these plumes were compared. A detailed
statistical analysis of the different plume categories for different gaseous
and aerosol species is presented in this paper.
The comparison of NEMR values showed that CH4 concentrations were
higher in air-masses that were influenced by urban emissions. Fresh biomass
burning plumes mixed with urban emissions showed a higher degree of
oxidative processing in comparison with fresh biomass burning only plumes.
This was evident in higher concentrations of inorganic aerosol components
such as sulfate, nitrate and ammonium, but not reflected in the organic
components. Lower NOx NEMRs combined with high sulfate, nitrate and
ammonium NEMRs in aerosols of plumes subject to long-range transport, when
comparing all plume categories, provided evidence of advanced processing of
these plumes. |
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