Abstract
A newly developed condensation particle counter UF-02 was approbated and tested. The investigations of the measured concentration range have shown that the condensation particle counter UF-02 can be used for measuring the particle number concentration from 0.002 to 100 000 cm i3 , and the determined cut-off size was 4 nm. Three newly developed condensation particle counters (CPCs) UF-02 were tested at the SMEAR I station in V‰rriˆ (Lapland, Finland). The studied period covers 26 April and 12 May 2003. These CPCs were used for measurement of the aerosol particle number concentration in the atmospheric boundary layer at the SMEAR I station. Two instruments were set into action with the cut-off size of 4.5 nm and one with 10 nm. The data of the particle number concentration variability were collected. The air mass backward trajectories were used to estimate the prehistory of the air masses. Moreover, trace gas (O3, NOx, and SO2) concentrations were analysed. During these studies the calibration and inter-comparison of instruments were also performed. The information about new characteristics of the instruments was obtained.
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