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| Titel |
Concentrations and fluxes of aerosol particles during the LAPBIAT measurement campaign at Värriö field station |
| VerfasserIn |
T. M. Ruuskanen, M. Kaasik, P. P. Aalto, U. Hõrrak, M. Vana, M. Mårtensson, Y. J. Yoon, P. Keronen, G. Mordas, D. Ceburnis, E. D. Nilsson, C. O'Dowd, M. Noppel, T. Alliksaar, J. Ivask, M. Sofiev, M. Prank, M. Kulmala  |
| 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 ; 7, no. 14 ; Nr. 7, no. 14 (2007-07-16), S.3683-3700 |
| Datensatznummer |
250005132
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| Publikation (Nr.) |
 copernicus.org/acp-7-3683-2007.pdf |
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| Zusammenfassung |
| The LAPBIAT measurement campaign took place in the Värriö
SMEAR I measurement station located in Eastern Lapland in the spring
of 2003 between 26 April and 11 May. In this paper we describe the
measurement campaign, concentrations and fluxes of aerosol
particles, air ions and trace gases, paying special attention to an
aerosol particle formation event broken by a air mass change from a
clean Arctic air mass with new particle formation to polluted one
approaching from industrial areas of Kola Peninsula, Russia, lacking
new particle formation. Aerosol particle number flux measurements
show strong downward fluxes during that time. Concentrations of
coarse aerosol particles were high for 1–2 days before the
nucleation event (i.e. 28–29 April), very low immediately before
and during the observed aerosol particle formation event (30 April)
and increased moderately from the moment of sudden break of the
event. In general particle deposition measurements based on snow
samples show the same changes. Measurements of the mobility
distribution of air ions showed elevated concentrations of
intermediate air ions during the particle formation event. We
estimated the growth rates in the nucleation mode size range. For
particles <10 nm, the growth rate increases with size on 30
April. Dispersion modelling made with model SILAM support the
conclusion that the nucleation event was interrupted by an outbreak
of sulphate-rich air mass in the evening of 30 April that originated
from the industry at Kola Peninsula, Russia. The results of this
campaign highlight the need for detailed research in atmospheric
transport of air constituents for understanding the aerosol
dynamics. |
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