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| Titel |
Morphology, composition and mixing state of individual carbonaceous aerosol in urban Shanghai |
| VerfasserIn |
H. Fu, M. Zhang, W. Li, J. Chen, L. Wang, X. Quan, W. Wang |
| 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 ; 12, no. 2 ; Nr. 12, no. 2 (2012-01-16), S.693-707 |
| Datensatznummer |
250010524
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| Publikation (Nr.) |
 copernicus.org/acp-12-693-2012.pdf |
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| Zusammenfassung |
| A total of 834 individual aerosol particles were collected during
October and November 2010 in urban Shanghai, China. Particles were sampled
under different weather and air quality conditions. Morphologies,
compositions and mixing states of carbonaceous aerosols were investigated by
transmission electron microscopy (TEM) coupled with energy-dispersive X-ray
(EDX). Structures of some particles were verified using selected-area
electron diffraction (SAED). Among the aerosol particles observed,
carbonaceous aerosols were mainly categorized into four types: polymeric
organic compound (POC), soot, tar ball, and biogenic particle. Based on the
detailed TEM-EDX analysis, most of the particles were coated with secondary
organic aerosols (SOA), which commonly formed through condensation or
heterogeneous reactions of precursor gases on pre-existing particles. Aged
particles were associated with days with low wind velocities, showed complex
structures, and were bigger in size. The internally mixed particles of
sulphates, organics and soot were encountered frequently. Such internally
mixed particles may be preferentially formed during a stagnated air mass
during serious pollution events, such as on 13 November. Although relative
number counts varied with different species, sulphates (38–71%) and soot
(11–22%) constituted the most dominant species observed in the samples.
However, soil-derived particles (68%) were relatively more frequently
observed on the sample collected on 12 November during a dust storm. |
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