Figure 3. General measurement set-up.

The upper panel shows the set-up for polydisperse cloud condensation nuclei (CCN) measurements. Depending on the station specific set-up, the same or different inlet systems were used for the size distribution and optional chemical composition measurements. Dashed boxes and lines indicate that the specific set-up varied by station. The lower panel shows the same for monodisperse CCN measurements, whereby size distributions were either measured after the same neutralizer and differential mobility analyzer (DMA) or behind a second system (indicated with option 1 and 2). The methods section specifies which set-up each station used. ACSM=aerosol chemical speciation monitor, AMS=aerosol mass spectrometer, CCNC=cloud condensation nuclei counter, CPC=condensation particle counter.