Atmospheric Chemistry and Physics Discussions
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10.5194/acpd-7-709-2007
http://www.atmos-chem-phys-discuss.net/7/709/2007/
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http://www.atmos-chem-phys-discuss.net/7/709/2007/acpd-7-709-2007.pdf
709
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2007-01-17
Concentrations and fluxes of aerosol particles during the LAPBIAT measurement campaign in Värriö field station
T. M. Ruuskanen
taina.ruuskanen@helsinki.fi
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
University of Helsinki, Dept. of Physical Sciences, P.O. Box 64, 00014 University of Helsinki, Finland
Institute of Environmental Physics, University of Tartu, Tartu, Estonia
Department of Applied Environmental Science, Stockholm University, Stockholm, Sweden
Department of Experimental Physics, National University of Ireland, Galway, Ireland
Institute of Geology, Tallinn University of Technology, Tallinn, Estonia
Air Quality Research, Finnish Meteorological Institute, Finland
The LAPBIAT measurement campaign took place in the 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
polluted air mass approaching from industrial areas of Kola Peninsula,
Russia. 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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