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| Titel |
Aircraft measurements of polar organic tracer compounds in tropospheric particles (PM10) over central China |
| VerfasserIn |
P. Q. Fu, K. Kawamura, Y. F. Cheng, S. Hatakeyama, A. Takami, H. Li, 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 ; 14, no. 8 ; Nr. 14, no. 8 (2014-04-25), S.4185-4199 |
| Datensatznummer |
250118640
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| Publikation (Nr.) |
 copernicus.org/acp-14-4185-2014.pdf |
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| Zusammenfassung |
| Atmospheric aerosol samples were collected by aircraft at low to middle
altitudes (0.8–3.5 km a.g.l.) over central East to West China during summer
2003 and spring 2004. The samples were analyzed for polar organic compounds
using a technique of solvent extraction/BSTFA derivatization/gas
chromatography–mass spectrometry. Biogenic secondary organic aerosol (SOA)
tracers from the oxidation of isoprene were found to be more abundant in
summer (3.3–138 ng m−3, mean 39 ng m−3) than in spring (3.2–42 ng m−3,
15 ng m−3), while α/β-pinene and β-caryophyllene SOA tracers showed similar abundances between these two
seasons. A strong positive correlation (R2 = 0.83) between
levoglucosan and β-caryophyllinic acid was found in the spring
samples vs. a weak correlation (R2 = 0.17) in the summer
samples, implying substantial contributions from biomass burning to the
β-caryophyllinic acid production in spring. Two organic nitrogen
species (oxamic acid and carbamide) were detected in the aircraft aerosol
samples, and their concentrations were comparable to those of biogenic SOA
tracers. Most of the primary organic aerosol (POA) and SOA tracers were less abundant at higher
altitudes, suggesting they are of ground surface origin, either being
directly emitted from anthropogenic/natural sources on the ground surface,
or rapidly formed through photooxidation of their precursors emitted from
the ground surface and then diluted during uplifting into the troposphere.
This study demonstrates that primary biological aerosols, biogenic SOA, and
organic nitrogen species are important components of organic aerosols in the
troposphere over central China during warm seasons. |
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