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| Titel |
Oxygenated organic functional groups and their sources in single and submicron organic particles in MILAGRO 2006 campaign |
| VerfasserIn |
S. Liu, S. Takahama, L. M. Russell, S. Gilardoni, D. Baumgardner |
| 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 ; 9, no. 18 ; Nr. 9, no. 18 (2009-09-21), S.6849-6863 |
| Datensatznummer |
250007636
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| Publikation (Nr.) |
 copernicus.org/acp-9-6849-2009.pdf |
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| Zusammenfassung |
| Fourier Transform Infrared (FTIR) and X-ray Fluorescence (XRF) were
used to measure organic functional groups and elements of submicron
particles collected during MILAGRO in March 2006 on three platforms:
the Mexico City urban area (SIMAT), the high altitude site at 4010 m
(Altzomoni), and the NCAR C130 aircraft. Scanning Transmission X-ray
Microscopy (STXM) and Near-Edge X-ray Absorption Fine Structure
(NEXAFS) were applied to single particle organic functional group
abundance analysis of particles simultaneously collected at SIMAT and
C130. Correlations of elemental concentrations showed different groups
of source-related elements at SIMAT, Altzomoni, and C130, suggesting
different processes affecting the air masses sampled at the three
platforms. Cluster analysis resulted in seven distinct clusters of
FTIR spectra, with the last three clusters consisting of spectra
collected almost exclusively on the C130 platform, reflecting the
variety of sources contributing to C130 samples. Positive Matrix
Factorization (PMF) of STXM-NEXAFS spectra identified three main
factors representing soot, secondary, and biomass burning type
spectra. PMF of FTIR spectra resulted in two fossil fuel combustion
factors and one biomass burning factor, the former representative
of source regions to the northeast and southwest of SIMAT. Alkane,
carboxylic acid, amine, and alcohol functional groups were mainly
associated with combustion related sources, while non-acid carbonyl
groups were likely from biomass burning events. The majority of OM
and O/C was attributed to combustion sources, although no distinction
between direct emissions and atmospherically processed OM could be
identified. |
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