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Aerosol fluxes and their measurement technique

Vertical particle fluxes were measured applying condensation particle counter (CPC) model TSI 3010 in the eddy covariance technique. The EC is a widely used method to measure gas fluxes. Different aspects of the method have been described. During the measurement campaign in the spring 1998 (Biofor1), in parallel to the particle counter another of the same model counter was deployed (using one common sampling line). Counters operation controlling temperatures were shifted to have minimum detectable particle size 7 and 14 nm.
There was an attempt to estimate experimentally vertical transport of particles between these sizes. In the case of evident flux upward source of particles is between the ground level and the measurement point. During the measurement campaign in spring 1999 (biofor3) CPC TSI 3010 was modified to operate at 3 1pm sampling flow rate (10 nm cut-off size). The modification allowed increasing time resolution of the instrument and detection of relatively faster in time scale fluctuations. In parallel the same type of CPC was deployed operating at standard conditions. 1 1pm sampling flow rate and 10 cut-off size to validate the concentration measurements of the modified CPC.

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University of Helsinki
Siltavuorenpenger 20 D
00014 Helsinki
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