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| Titel |
Aerosol composition and sources during the Chinese Spring Festival: fireworks, secondary aerosol, and holiday effects |
| VerfasserIn |
Q. Jiang, Y. L. Sun, Z. Wang, Y. Yin |
| 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. 11 ; Nr. 15, no. 11 (2015-06-02), S.6023-6034 |
| Datensatznummer |
250119782
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| Publikation (Nr.) |
 copernicus.org/acp-15-6023-2015.pdf |
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| Zusammenfassung |
| Aerosol particles were characterized by an Aerodyne aerosol chemical
speciation monitor along with various collocated instruments in Beijing,
China, to investigate the role of fireworks (FW) and secondary aerosol in
particulate pollution during the Chinese Spring Festival of 2013. Three
FW events, exerting significant and short-term impacts on fine
particles (PM2.5), were observed on the days of Lunar New Year, Lunar
Fifth Day, and Lantern Festival. The FW were shown to have a large impact on
non-refractory potassium, chloride, sulfate, and organics in submicron
aerosol (PM1), of which FW organics appeared to be emitted
mainly in secondary, with its mass spectrum resembling that of secondary
organic aerosol (SOA). Pollution events (PEs) and clean periods (CPs)
alternated routinely throughout the study. Secondary particulate matter (SPM
= SOA + sulfate + nitrate + ammonium) dominated the total PM1
mass on average, accounting for 63–82% during nine PEs in this study. The
elevated contributions of secondary species during PEs resulted in a higher
mass extinction efficiency of PM1 (6.4 m2 g-1) than
during CPs (4.4 m2 g-1). The Chinese Spring Festival also provides
a unique opportunity to study the impact of reduced anthropogenic emissions
on aerosol chemistry in the city. Primary species showed ubiquitous
reductions during the holiday period with the largest reduction being in cooking
organic aerosol (OA; 69%), in nitrogen monoxide (54%), and in coal combustion OA (28%).
Secondary sulfate, however, remained only slightly changed, and the SOA and the
total PM2.5 even slightly increased. Our results have significant
implications for controlling local primary source emissions during PEs,
e.g., cooking and traffic activities. Controlling these factors might have a limited effect on
improving air quality in the megacity of Beijing, due to the dominance of SPM from
regional transport in aerosol particle composition. |
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