Atmospheric Chemistry and Physics Discussions
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8
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2008
10.5194/acpd-8-7263-2008
http://www.atmos-chem-phys-discuss.net/8/7263/2008/
http://www.atmos-chem-phys-discuss.net/8/7263/2008/acpd-8-7263-2008.html
http://www.atmos-chem-phys-discuss.net/8/7263/2008/acpd-8-7263-2008.pdf
7263
7288
2008-04-15
Mode resolved density of atmospheric aerosol particles
J. Kannosto
M. Lemmetty
A. Virtanen
annele.virtanen@tut.fi
J. M. Mäkelä
J. Keskinen
H. Junninen
T. Hussein
P. Aalto
M. Kulmala
Tampere University of Technology, Department of Physics, Aerosol Physics Laboratory, P.O.Box 692, FIN-33101 Tampere, Finland
Department of Physics, University of Helsinki, P.O.Box 64, FI-00014 Uhel, Finland
In this study, we investigate the mode resolved density of ultrafine
atmospheric particles measured in boreal forest environment. The method used
here enables us to find the distinct density information for each mode in
atmospheric fine particle population: the density values for nucleation,
Aitken, and accumulation mode particles are presented. The experimental data
was gained during 2 May 2005–19 May 2005 at the boreal forest measurement
station "SMEAR II" in Hyytiälä, southern Finland. The density
values for accumulation mode varied from 1.1 to 2 g/cm<sup>3</sup> (average 1.5 g/cm<sup>3</sup>) and for Aitken mode from 0.4 to 2 g/cm<sup>3</sup> (average
0.97 g/cm<sup>3</sup>. As an overall trend during the two weeks campaign, the density
value of Aitken mode was seen to gradually increase. With the present
method, the time dependent behaviour of the particle density can be
investigated in time scale of 10 min. This allows us the follow the
density evolution of the nucleation mode particles during the particle
growth process following the nucleation burst. The density of nucleation
mode particles decreased during the growth process. The density values for
15 nm particles were 1.2–1.5 g/cm<sup>3</sup> and for grown 30 nm particles
0.5–1 g/cm<sup>3</sup>. These values are consistent with the present knowledge that
the condensing species are semi volatile organics, emitted from the Boreal
forest.
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