A synthesis of cloud condensation nuclei counter (CCNC) measurements within the EUCAARI network ...

• Main Authors: Paramonov, Mikhail, Kerminen, Veli-Matti, Gysel, Martin, Aalto, P. P., Andreae, Meinrat O., Asmi, Eija, Baltensperger, Urs, Bougiatioti, Aikaterini, Brus, David, Frank, Göran, Good, N., Gunthe, Sachin S., Hao, Liqing, Irwin, M., Jaatinen, A., Jurányi, Zsófia, King, S. M., Kortelainen, A., Kristensson, Adam, Lihavainen, Heikki, Kulmala, Markku, Lohmann, Ulrike, Martin, Scot T., McFiggans, Gordon, Mihalopoulos, Nikolaos, Nenes, Athanasios, O'Dowd, Colin, Ovadnevaite, Jurgita, Petäjä, Tuukka, Pöschl, Ulrich, Roberts, Greg, Rose, D., Svenningsson, Brigitta, Swietlicki, Erik, Weingartner, Ernest, Whitehead, James, Wiedensohler, Alfred, Wittbom, Cerina, Sierau, Berko
• Format: Article in Journal/Newspaper
• Language: English
• Published: Copernicus 2015
• Subjects: 620 - Ingenieurwissenschaften und Maschinenbau; Northern Finland
• Online Access: https://dx.doi.org/10.26041/fhnw-8076; https://irf.fhnw.ch/handle/11654/44263

Cloud condensation nuclei counter (CCNC) measurements performed at 14 locations around the world within the European Integrated project on Aerosol Cloud Climate and Air Quality interactions (EUCAARI) framework have been analysed and discussed with respect to the cloud condensation nuclei (CCN) activation and hygroscopic properties of the atmospheric aerosol. The annual mean ratio of activated cloud condensation nuclei (NCCN) to the total number concentration of particles (NCN), known as the activated fraction A, shows a similar functional dependence on supersaturation S at many locations – exceptions to this being certain marine locations, a free troposphere site and background sites in south-west Germany and northern Finland. The use of total number concentration of particles above 50 and 100 nm diameter when calculating the activated fractions (A50 and A100, respectively) renders a much more stable dependence of A on S; A50 and A100 also reveal the effect of the size distribution on CCN activation. With ...