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| Titel |
Long term particle size distribution measurements at Mount Waliguan, a high-altitude site in inland China |
| VerfasserIn |
N. Kivekäs, J. Sun, M. Zhan, V.-M. Kerminen, A. Hyvärinen, M. Komppula, Y. Viisanen, N. Hong, Y. Zhang, M. Kulmala  , X.-C. Zhang, Deli-Geer, H. Lihavainen |
| 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 ; 9, no. 15 ; Nr. 9, no. 15 (2009-08-03), S.5461-5474 |
| Datensatznummer |
250007553
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| Publikation (Nr.) |
 copernicus.org/acp-9-5461-2009.pdf |
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| Zusammenfassung |
| Particle number size distributions in size range 12–570 nm were measured
continuously at Mount Waliguan, a remote mountain-top station in inland
China. The station is located at the altitude of 3816 m a.s.l., and some
600–1200 m above the surrounding area. The measurement period lasted from
September 2005 to May 2007. The measurements were verified with independent
CPC measurements at the same site. The average particle concentration in
ambient conditions was 2030 cm−3, which is higher than the values
measured at similar altitude in other regions of the world. On average, the
Aitken mode contributed to roughly half of the particle number concentration.
The concentrations were found to be higher during the summer than during the
winter. The diurnal variation was also investigated and a clear pattern was
found for the nucleation mode during all seasons, so that the nucleation mode
particle concentration increased in the afternoon. The same pattern was
visible in the Aitken mode during the summer, whereas the accumulation mode
did not show any level of diurnal pattern during any season. Excluding the
nucleation mode, the average day-time particle concentrations were not
significantly higher than those measured at night-time, indicating no
systematic pattern of change between planetary boundary layer conditions and
free troposphere conditions. In air masses coming from east, the number
concentration of particles was higher than in other air masses, which
indicates that the air mass might be affected anthropogenic pollution east of
the station. Also other factors, such as active new-particle formation, keep
aerosol number concentrations high in the area. |
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