naa a22 4500 530098601 20181026074615.0 cr unu---uuuuu 181026s2015 xx s 000 0 eng 10.3929/ethz-b-000106275 doi 10.5194/acp-15-12211-2015 doi (ETHRESEARCH)oai:www.research-collection.ethz.ch:20.500.11850/106275 A synthesis of cloud condensation nuclei counter (CCNC) measurements within the EUCAARI network [Elektronische Daten] [Mikhail Paramonov, Veli-Matti Kerminen, Martin Gysel, Pasi P. Aalto, Meinrat O. Andreae, Eija Asmi, Urs Baltensperger, Aikaterini Bougiatioti, David Brus, G.P. Frank, N. Good, Sachin S. Gunthe, L. Hao, Martin Irwin, Antti Jaatinen, Zsófia Jurányi, S.M. King, Aki Kortelainen, Adam Kristensson, Heikki Lihavainen, Markku Kulmala, Ulrike; id_orcid 0000-0001-8885-3785 Lohmann, Scot T. Martin, Gordon McFiggans, Nikolaos Mihalopoulos, Athanasios Nenes, Colin D. O'Dowd, Jurgita Ovadnevaite, Tuukka Petäjä, Ulrich Pöschl, Gregory C. Roberts, Diana Rose, Birgitta Svenningsson, Erik Swietlicki, Ernest; id_orcid 0000-0002-2427-4634 Weingartner, James Whitehead, Alfred Wiedensohler, C. Wittbom, Berko Sierau] Atmos. chem. phys. Open access ethresearch 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 respect to chemical composition, it was found that the hygroscopicity of aerosol particles as a function of size differs among locations. The hygroscopicity parameter κ decreased with an increasing size at a continental site in south-west Germany and fluctuated without any particular size dependence across the observed size range in the remote tropical North Atlantic and rural central Hungary. At all other locations κ increased with size. In fact, in Hyytiälä, Vavihill, Jungfraujoch and Pallas the difference in hygroscopicity between Aitken and accumulation mode aerosol was statistically significant at the 5 % significance level. In a boreal environment the assumption of a size-independent κ can lead to a potentially substantial overestimation of NCCN at S levels above 0.6 %. The same is true for other locations where κ was found to increase with size. While detailed information about aerosol hygroscopicity can significantly improve the prediction of NCCN, total aerosol number concentration and aerosol size distribution remain more important parameters. The seasonal and diurnal patterns of CCN activation and hygroscopic properties vary among three long-term locations, highlighting the spatial and temporal variability of potential aerosol-cloud interactions in various environments. Creative Commons Attribution 3.0 Unported http://creativecommons.org/licenses/by/3.0 ethresearch Paramonov Mikhail joint author Kerminen Veli-Matti joint author Gysel Martin joint author Aalto Pasi P. joint author Andreae Meinrat O. joint author Asmi Eija joint author Baltensperger Urs joint author Bougiatioti Aikaterini joint author Brus David joint author Frank G.P. joint author Good N. joint author Gunthe Sachin S. joint author Hao L. joint author Irwin Martin joint author Jaatinen Antti joint author Jurányi Zsófia joint author King S.M. joint author Kortelainen Aki joint author Kristensson Adam joint author Lihavainen Heikki joint author Kulmala Markku joint author Lohmann Ulrike; id_orcid 0000-0001-8885-3785 joint author Martin Scot T. joint author McFiggans Gordon joint author Mihalopoulos Nikolaos joint author Nenes Athanasios joint author O'Dowd Colin D. joint author Ovadnevaite Jurgita joint author Petäjä Tuukka joint author Pöschl Ulrich joint author Roberts Gregory C. joint author Rose Diana joint author Svenningsson Birgitta joint author Swietlicki Erik joint author Weingartner Ernest; id_orcid 0000-0002-2427-4634 joint author Whitehead James joint author Wiedensohler Alfred joint author Wittbom C. joint author Sierau Berko joint author Atmospheric Chemistry and Physics Göttingen : Copernicus 15 (21), pp. 12211-12229 1680-7375 http://hdl.handle.net/20.500.11850/106275 text/html WWW-Backlink auf das Repository (Open access) 1 Journal Article ethresearch ETHRESEARCH 856 40 http://hdl.handle.net/20.500.11850/106275 text/html WWW-Backlink auf das Repository (Open access) ETHRESEARCH 700 1- Paramonov Mikhail joint author ETHRESEARCH 700 1- Kerminen Veli-Matti joint author ETHRESEARCH 700 1- Gysel Martin joint author ETHRESEARCH 700 1- Aalto Pasi P. joint author ETHRESEARCH 700 1- Andreae Meinrat O. joint author ETHRESEARCH 700 1- Asmi Eija joint author ETHRESEARCH 700 1- Baltensperger Urs joint author ETHRESEARCH 700 1- Bougiatioti Aikaterini joint author ETHRESEARCH 700 1- Brus David joint author ETHRESEARCH 700 1- Frank G.P. joint author ETHRESEARCH 700 1- Good N. joint author ETHRESEARCH 700 1- Gunthe Sachin S. joint author ETHRESEARCH 700 1- Hao L. joint author ETHRESEARCH 700 1- Irwin Martin joint author ETHRESEARCH 700 1- Jaatinen Antti joint author ETHRESEARCH 700 1- Jurányi Zsófia joint author ETHRESEARCH 700 1- King S.M. joint author ETHRESEARCH 700 1- Kortelainen Aki joint author ETHRESEARCH 700 1- Kristensson Adam joint author ETHRESEARCH 700 1- Lihavainen Heikki joint author ETHRESEARCH 700 1- Kulmala Markku joint author ETHRESEARCH 700 1- Lohmann Ulrike; id_orcid 0000-0001-8885-3785 joint author ETHRESEARCH 700 1- Martin Scot T. joint author ETHRESEARCH 700 1- McFiggans Gordon joint author ETHRESEARCH 700 1- Mihalopoulos Nikolaos joint author ETHRESEARCH 700 1- Nenes Athanasios joint author ETHRESEARCH 700 1- O'Dowd Colin D. joint author ETHRESEARCH 700 1- Ovadnevaite Jurgita joint author ETHRESEARCH 700 1- Petäjä Tuukka joint author ETHRESEARCH 700 1- Pöschl Ulrich joint author ETHRESEARCH 700 1- Roberts Gregory C. joint author ETHRESEARCH 700 1- Rose Diana joint author ETHRESEARCH 700 1- Svenningsson Birgitta joint author ETHRESEARCH 700 1- Swietlicki Erik joint author ETHRESEARCH 700 1- Weingartner Ernest; id_orcid 0000-0002-2427-4634 joint author ETHRESEARCH 700 1- Whitehead James joint author ETHRESEARCH 700 1- Wiedensohler Alfred joint author ETHRESEARCH 700 1- Wittbom C. joint author ETHRESEARCH 700 1- Sierau Berko joint author ETHRESEARCH 773 0- Atmospheric Chemistry and Physics Göttingen : Copernicus 15 (21), pp. 12211-12229 1680-7375 BK010053 XK010053 XK010000 ETHRESEARCH ETHRESEARCH ETHRESEARCH Journal Article Open access