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| Titel |
Mixing state of individual submicron carbon-containing particles during spring and fall seasons in urban Guangzhou, China: a case study |
| VerfasserIn |
G. Zhang, X. Bi, L. Li, L. Y. Chan, M. Li, X. Wang, G. Sheng, J. Fu, Z. Zhou |
| 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 ; 13, no. 9 ; Nr. 13, no. 9 (2013-05-07), S.4723-4735 |
| Datensatznummer |
250018637
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| Publikation (Nr.) |
 copernicus.org/acp-13-4723-2013.pdf |
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| Zusammenfassung |
| Growing evidence suggests that the size-resolved mixing state of
carbon-containing particles is very critical in determining their optical
properties, atmospheric lifetime, and impact on the environment. However,
still little is known about the mixing state of particles in the urban area of
the Pearl River Delta (PRD) region, China. To investigate the mixing state of
submicron carbon-containing particles, measurements were carried out during
spring and fall periods of 2010 using a single-particle aerosol mass
spectrometer (SPAMS). Approximately 700 000 particles for each period were
detected. This is the first report on the size-resolved mixing state of
carbon-containing particles by direct observations in the PRD region.
Cluster analysis of single-particle mass spectra was applied to identify
carbon-containing particle classes. These classes represented
~80% and ~90% of all the detected
particles for spring and fall periods, respectively. Carbon-containing
particle classes mainly consisted of biomass/biofuel burning particles
(Biomass), organic carbon (OC), fresh elemental carbon (EC-fresh),
internally mixed OC and EC (ECOC), internally mixed EC with sulfate
(EC-Sulfate), vanadium-containing ECOC (V-ECOC), and amines-containing
particles (Amine). In spring, the top three ranked carbon-containing
particle classes were ECOC (26.1%), Biomass (23.6%) and OC (10%),
respectively. However, the fraction of Biomass particles increased
remarkably and predominated (61.0%), while the fraction of ECOC (3.0%)
and V-ECOC (0.1%) significantly decreased in fall. To highlight the
influence of monsoon on the properties of carbon-containing particles in
urban Guangzhou, their size distributions, mixing state, and aerosol acidity
were compared between spring and fall seasons. In addition, a case study was
also performed to investigate how the formation of fog and haze influenced
the mixing state of carbon-containing particles. These results could
improve our understanding of the mixing state of carbon-containing particles,
and may also be helpful in modeling the climate forcing of aerosol in the
PRD region. |
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