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| Titel |
Observation of biogenic secondary organic aerosols in the atmosphere of a mountain site in central China: temperature and relative humidity effects |
| VerfasserIn |
J. J. Li, G. H. Wang, J. J. Cao, X. M. Wang, R. J. Zhang |
| 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. 22 ; Nr. 13, no. 22 (2013-11-28), S.11535-11549 |
| Datensatznummer |
250085841
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| Publikation (Nr.) |
 copernicus.org/acp-13-11535-2013.pdf |
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| Zusammenfassung |
| Secondary organic aerosols (SOA) derived from isoprene,
pinene and caryophyllene were determined for PM10 and size-segregated
(9-stages) aerosols collected at the summit (2060 m a.s.l.) of Mt. Hua,
central China during the summer of 2009. Estimated concentrations of
isoprene, α-/β-pinene and β-caryophyllene derived
secondary organic carbon (SOC) are 81 ± 53, 29 ± 14 and 98 ± 53 ng m−3,
accounting for 2.7 ± 1.0%, 0.8 ± 0.2% and
2.1 ± 1.0% of OC, respectively. Concentrations of biogenic (BSOA,
the isoprene/pinene/caryophyllene oxidation products) and anthropogenic
(ASOA, mainly aromatic acids) SOA positively correlated with temperature
(R=0.57–0.90). However, a decreasing trend of BSOA concentration with an
increase in relative humidity (RH) was observed during the sampling period,
although a clear trend between ASOA and RH was not found. Based on the AIM
Model calculation, we found that during the sampling period an increase in
RH resulted in a decrease in the aerosol acidity and thus reduced the effect
of acid-catalysis on BSOA formation. There was no significant correlation
observed for the BSOA products and anthropogenic parameters (e.g. EC,
SO42− and NO4−). Size distribution measurements showed
that most of the determined BSOA are formed in the aerosol phase and
enriched in the fine mode (<2.1 μm) except for cis-pinonic acid,
which is formed in the gas phase and subsequently partitioned into aerosol
phase and thus presents a bimodal pattern with a small peak in the fine mode
and a large peak in the coarse mode (>2.1 μm). |
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