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Paasonen, P. (author), Asmi, A. (author), Petäjä, T. (author), Kajos, M.K. (author), Äijälä, M. (author), Junninen, H. (author), Holst, T. (author), Abbatt, J.P.D. (author), Arneth, A. (author), Birmili, W. (author), Denier van der Gon, H.A.C. (author), Hamed, A. (author), Hoffer, A. (author), Laakso, L. (author), Laaksonen, A. (author), Richard Leaitch, W. (author), Plass-Dülmer, C. (author), Pryor, S.C. (author), Räisänen, P. (author), Swietlicki, E. (author), Wiedensohler, A. (author), Worsnop, D.R. (author), Kerminen, V.-M. (author), Kulmala, M. (author)Atmospheric aerosol particles influence the climate system directly by scattering and absorbing solar radiation, and indirectly by acting as cloud condensation nuclei. Apart from black carbon aerosol, aerosols cause a negative radiative forcing at the top of the atmosphere and substantially mitigate the warming caused by greenhouse gases. In the...article 2013
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South African EUCAARI measurements: Seasonal variation of trace gases and aerosol optical propertiesLaakso, L. (author), Vakkari, V. (author), Virkkula, A. (author), Laakso, H. (author), Backman, J. (author), Kulmala, M. (author), Beukes, J.P. (author), van Zyl, P.G. (author), Tiitta, P. (author), Josipovic, M. (author), Pienaar, J.J. (author), Chiloane, K. (author), Gilardoni, S. (author), Vignati, E. (author), Wiedensohler, A. (author), Tuch, T. (author), Birmili, W. (author), Piketh, S. (author), Collett, K. (author), Fourie, G.D. (author), Komppula, M. (author), Lihavainen, H. (author), de Leeuw, G. (author), Kerminen, V.-M. (author)In this paper we introduce new in situ observations of atmospheric aerosols, especially chemical composition, physical and optical properties, on the eastern brink of the heavily polluted Highveld area in South Africa. During the observation period between 11 February 2009 and 31 January 2011, the mean particle number concentration (size range...article 2012
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Kulmala, M. (author), Asmi, A. (author), Lappalainen, H.K. (author), Baltensperger, U. (author), Brenguier, J.-L. (author), Facchini, M.C. (author), Hansson, H.-C. (author), Hov, Ø. (author), O'Dowd, C.D. (author), Pöschl, U. (author), Wiedensohler, A. (author), Boers, R. (author), Boucher, O. (author), de Leeuw, G. (author), Denier van der Gon, H.A.C. (author), Feichter, J. (author), Krejci, R. (author), Laj, P. (author), Lihavainen, H. (author), Lohmann, U. (author), McFiggans, G. (author), Mentel, T. (author), Pilinis, C. (author), Riipinen, I. (author), Schulz, M. (author), Stohl, A. (author), Swietlicki, E. (author), Vignati, E. (author), Alves, C. (author), Amann, M. (author), Ammann, M. (author), Arabas, S. (author), Artaxo, P. (author), Baars, H. (author), Beddows, D.C.S. (author), Bergström, R. (author), Beukes, J.P. (author), Bilde, M. (author), Burkhart, J.F. (author), Canonaco, F. (author), Clegg, S.L. (author), Coe, H. (author), Crumeyrolle, S. (author), D'Anna, B. (author), Decesari, S. (author), Gilardoni, S. (author), Fischer, M. (author), Fjaeraa, A.M. (author), Fountoukis, C. (author), George, C. (author), Gomes, L. (author), Halloran, P. (author), Hamburger, T. (author), Harrison, R.M. (author), Herrmann, H. (author), Hoffmann, T. (author), Hoose, C. (author), Hu, M. (author), Hyvärinen, A. (author), Hõrrak, U. (author), Iinuma, Y. (author), Iversen, T. (author), Josipovic, M. (author), Kanakidou, M. (author), Kiendler-Scharr, A. (author), Kirkevåg, A. (author), Kiss, G. (author), Klimont, Z. (author), Kolmonen, P. (author), Komppula, M. (author), Kristjánsson, J.-E. (author), Laakso, L. (author), Laaksonen, A. (author), Labonnote, L. (author), Lanz, V.A. (author), Lehtinen, K.E.J. (author), Rizzo, L.V. (author), Makkonen, R. (author), Manninen, H.E. (author), McMeeking, G. (author), Merikanto, J. (author), Minikin, A. (author), Mirme, S. (author), Morgan, W.T. (author), Nemitz, E. (author), O'Donnell, D. (author), Panwar, T.S. (author), Pawlowska, H. (author), Petzold, A. (author), Pienaar, J.J. (author), Pio, C. (author), Plass-Duelmer, C. (author), Prévôt, A.S.H. (author), Pryor, S. (author), Reddington, C.L. (author), Roberts, G. (author), Rosenfeld, D. (author), Schwarz, J. (author), Seland, O. (author), Sellegri, K. (author), Shen, X.J. (author), Shiraiwa, M. (author), Siebert, H. (author), Sierau, B. (author), Simpson, D. (author), Sun, J.Y. (author), Topping, D. (author), Tunved, P. (author), Vaattovaara, P. (author), Vakkari, V. (author), Veefkind, J.P. (author), Visschedijk, A. (author), Vuollekoski, H. (author), Vuolo, R. (author), Wehner, B. (author), Wildt, J. (author), Woodward, S. (author), Worsnop, D.R. (author), van Zadelhoff, G.J. (author), Zardini, A.A. (author), Zhang, K. (author), van Zyl, P.G. (author), Kerminen, V.-M. (author), Carslaw, K.S. (author), Pandis, S.N. (author)In this paper we describe and summarize the main achievements of the European Aerosol Cloud Climate and Air Quality Interactions project (EUCAARI). EUCAARI started on 1 January 2007 and ended on 31 December 2010 leaving a rich legacy including: (a) a comprehensive database with a year of observations of the physical, chemical and optical...article 2011
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Laakso, L. (author), Vakkari, V. (author), Laakso, H. (author), Virkkula, A. (author), Kulmala, M. (author), Beukes, J.P. (author), van Zyl, P.G. (author), Pienaar, J.J. (author), Chiloane, K. (author), Gilardoni, S. (author), Vignati, E. (author), Wiedensohler, A. (author), Tuch, T. (author), Birmili, W. (author), Piketh, S. (author), Collett, K. (author), Fourie, G.D. (author), Komppula, M. (author), Lihavainen, H. (author), de Leeuw, G. (author), Kerminen, V.-M. (author), TNO Bouw en Ondergrond (author)In this paper, new long-term measurements of chemical composition and physical properties of atmospheric aerosols carried out on the eastern brink of the heavily polluted Highveld area in South Africa are introduced. As expected, a high variability of aerosol properties was observed. Optical properties of aerosol particles were found to be...article 2010
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Verheggen, B. (author), Duplissy, J. (author), Enghoff, M.B. (author), Aplin, K.L. (author), Arnold, F. (author), Aufmhoff, H. (author), Avngaard, M. (author), Baltensperger, U. (author), Bondo, T. (author), Bingham, R. (author), Carslaw, K. (author), Curtius, J. (author), David, A. (author), Fastrup, B. (author), Gagne, S. (author), Hahn, F. (author), Kirkby, J. (author), Onnela, A. (author), Veenhof, R. (author), Wilhelmsson, M. (author), Harrison, R.G. (author), Kellett, B. (author), Lockwood, M. (author), Kulmala, M. (author), Laakso, L. (author), Nieminen, T. (author), Sipila, M. (author), Laaksonen, A. (author), Lillestol, E. (author), Makela, J. (author), Makhmutov, V. (author), Stozhkov, Y. (author), Marsh, N.D. (author), Pedersen, J.O.P. (author), Polny, J. (author), Svensmark, H. (author), Svensmark, J. (author), Pedersen, E. (author), Reichl, U. (author), Seinfeld, J.H. (author), Stratmann, F. (author), Wex, H. (author), Wehrle, G. (author), Weingartner, E. (author), Viisanen, Y. (author), Wagner, P.E. (author), Winkler, P.M. (author)During a 4-week run in October–November 2006, a pilot experiment was performed at the CERN Proton Synchrotron in preparation for the Cosmics Leaving Outdoor Droplets (CLOUD) experiment, whose aim is to study the possible influence of cosmic rays on clouds. The purpose of the pilot experiment was firstly to carry out exploratory measurements of...article 2010