CERN Accelerating science

CLOUD Papers

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2017-12-16
17:14
Characterization of positive clusters in the CLOUD nucleation experiments / Bianchi, Federico (PSI, Villigen) ; Tröstl, Jasmin (PSI, Villigen) ; Schobesberger, Siegfried (Helsinki U.) ; Junninen, Heikki (Helsinki U.) ; Dommen, Josef (PSI, Villigen) ; Worsnop, Douglas R (Helsinki U.) ; Baltensperger, Urs (PSI, Villigen) /CLOUD
The mechanism of new particle formation (NPF) events is still poorly understood. The CLOUD experiment is studying at which conditions this process occurs. [...]
2013 - 4 p. - Published in : AIP Conf. Proc. 1527 (2013) 346-349

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2017-12-16
17:14
Aerosol nucleation and growth in a mixture of sulfuric acid/alpha-pinene oxidation products at the CERN CLOUD chamber / Tröstl, Jasmin (PSI, Villigen) ; Bianchi, Federico (PSI, Villigen) ; Kürten, Andreas (Frankfurt U.) ; Rondo, Linda (Frankfurt U.) ; Simon, Mario (Frankfurt U.) ; Sarnela, Nina (Helsinki U.) ; Jokinen, Tuija (Helsinki U. ; TROPOS, Leibniz) ; Heinritzi, Martin (Innsbruck U.) ; Dommen, Josef (PSI, Villigen) ; Kirkby, Jasper (CERN) et al. /CLOUD
The role of α-pinene in aerosol nucleation and growth was investigated using the CERN CLOUD chamber, a nano scanning mobility particle sizer (nanoSMPS) and several condensation particle counters (CPCs) with different diameter cut-offs. Different oxidation conditions for α-pinene - OH⋅ vs. [...]
2013 - 4 p. - Published in : AIP Conf. Proc. 1527 (2013) 322-325

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2017-12-16
17:14
Nucleation of H2SO4 and oxidized organics in CLOUD experiment / Sipilä, Mikko (Helsinki U.) ; Sarnela, Nina (Helsinki U.) ; Jokinen, Tuija (Helsinki U.) ; Nieminen, Tuomo (Helsinki U.) ; Almeida, Joao (Frankfurt U.) ; Tröstl, Jasmin (PSI, Villigen) ; Lehtipalo, Katrianne (Helsinki U.) ; Duplissy, Jonathan (Helsinki U.) ; Junninen, Heikki (Helsinki U.) /CLOUD
The research of atmospheric new particle formation has proceeded lately as the role of sulphuric acid has been established. Still, the roles of other atmospheric compounds in nucleation remain largely unclear. [...]
2013 - 4 p. - Published in : AIP Conf. Proc. 1527 (2013) 318-321

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2017-12-16
17:14
A double inversion: Size and time resolved growth rates for aerosol particles in the CERN CLOUD experiment / Williamson, C (Goethe U., Frankfurt (main)) ; Curtius, J (Goethe U., Frankfurt (main)) ; Kürten, A (Goethe U., Frankfurt (main)) ; Almeida, J (Goethe U., Frankfurt (main)) ; Ehrhart, S (Goethe U., Frankfurt (main)) ; Wimmer, D (Goethe U., Frankfurt (main) ; Helsinki U.) ; Lehtipalo, K (Helsinki U.) ; Tröstl, J (PSI, Villigen) /CLOUD
An integrated analysis of multiple instruments measuring concentrations of aerosol particles in the CLOUD (Cosmics Leaving OUtdoor Droplets) chamber at CERN obtains size and time dependent growth rates. A matrix inversion is performed twice: first to get size distributions from measured concentrations using instrument transfer functions; secondly to get growth rates from size distributions using the aerosol general dynamic equation (GDE)..
2013 - 5 p. - Published in : AIP Conf. Proc. 1527 (2013) 389-392

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2017-11-08
06:21
Insight into Acid–Base Nucleation Experiments by Comparison of the Chemical Composition of Positive, Negative, and Neutral Clusters / Bianchi, Federico (PSI, Villigen) ; Praplan, Arnaud P (Helsinki U.) ; Sarnela, Nina (Helsinki U.) ; Dommen, Josef (PSI, Villigen) ; Kürten, Andreas (Goethe U., Frankfurt (main)) ; Ortega, Ismael K (Lille U.) ; Schobesberger, Siegfried (Helsinki U.) ; Junninen, Heikki (Helsinki U.) ; Simon, Mario (Goethe U., Frankfurt (main)) ; Tröstl, Jasmin (PSI, Villigen) et al.
We investigated the nucleation of sulfuric acid together with two bases (ammonia and dimethylamine), at the CLOUD chamber at CERN. The chemical composition of positive, negative, and neutral clusters was studied using three Atmospheric Pressure interface-Time Of Flight (APi-TOF) mass spectrometers: two were operated in positive and negative mode to detect the chamber ions, while the third was equipped with a nitrate ion chemical ionization source allowing detection of neutral clusters. [...]
2014 - 10 p. - Published in : Environ. Sci. Technol. 48 (2014) 13675-13684 Fulltext: PDF;

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2017-11-04
11:33
Causes and importance of new particle formation in the present-day and preindustrial atmospheres / Gordon, Hamish (Leeds U.) ; Kirkby, Jasper (CERN ; Goethe U., Frankfurt (main)) ; Baltensperger, Urs (PSI, Villigen) ; Bianchi, Federico (Helsinki U.) ; Breitenlechner, Martin (Harvard U. (main)) ; Curtius, Joachim (Goethe U., Frankfurt (main)) ; Dias, Antonio (CERN) ; Dommen, Josef (PSI, Villigen) ; Donahue, Neil M (Carnegie Mellon U.) ; Dunne, Eimear M (Kuopio U.) et al.
New particle formation has been estimated to produce around half of cloud-forming particlesin the present-day atmosphere, via gas-to-particle conversion. Here we assess the importance of newparticle formation (NPF) for both the present-day and the preindustrial atmospheres [...]
2017 - 22 p. - Published in : J. Geophys. Res. 122 (2017) 8739-8760 Fulltext: PDF;

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2017-11-04
11:33
Effect of ions on sulfuric acid-water binary particle formation: 1. Theory for kinetic- and nucleation-type particle formation and atmospheric implications / Merikanto, Joonas (Helsinki Inst. of Phys. ; Finnish Meteorological Inst.) ; Duplissy, Jonathan (Helsinki U. ; Helsinki Inst. of Phys.) ; Määttänen, Anni (Versailles U., Velizy ; LATMOS, Guyancourt ; Paris U., IV) ; Henschel, Henning (Helsinki U.) ; Donahue, Neil M (Carnegie Mellon U.) ; Brus, David (Finnish Meteorological Inst.) ; Schobesberger, Siegfried (Helsinki Inst. of Phys.) ; Kulmala, Markku (Helsinki U.) ; Vehkamäki, Hanna (Helsinki Inst. of Phys.)
We derive a version of Classical Nucleation Theory normalized by quantum chemical results on sulfuric acid-water hydration to describe neutral and ion-induced particle formation in the binary sulfuric acid-water system. The theory is extended to treat the kinetic regime where the nucleation free energy barrier vanishes at high sulfuric acid concentrations or low temperatures. [...]
2016 - 16 p. - Published in : J. Geophys. Res. 121 (2016) 1736-1751 External link: Fulltext

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2017-06-13
06:17
On the composition of ammonia–sulfuric-acid ion clusters during aerosol particle formation / Schobesberger, S (Helsinki U.) ; Franchin, A (Helsinki U.) ; Bianchi, F (PSI, Villigen) ; Rondo, L (Goethe U., Frankfurt (main)) ; Duplissy, J (Helsinki U. ; CERN) ; Kürten, A (Goethe U., Frankfurt (main)) ; Ortega, I K (Helsinki U. ; PhLAM, Villeneuve d'Ascq) ; Metzger, A (Ionicon Analytik GmbH, Innsbruck) ; Schnitzhofer, R (Innsbruck U.) ; Almeida, J (CERN) et al.
The formation of particles from precursor vapors is an important source of atmospheric aerosol. Research at the Cosmics Leaving OUtdoor Droplets (CLOUD) facility at CERN tries to elucidate which vapors are responsible for this new-particle formation, and how in detail it proceeds. [...]
2015 - 24 p. - Published in : Atmosph. Chem. Phys. 15 (2015) 55-78 Fulltext: PDF;

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2017-06-13
06:17
Elemental composition and clustering behaviour of α-pinene oxidation products for different oxidation conditions / Praplan, A P (Helsinki U.) ; Schobesberger, S (Helsinki U.) ; Bianchi, F (PSI, Villigen ; Zurich, ETH) ; Rissanen, M P (Helsinki U.) ; Ehn, M (Helsinki U.) ; Jokinen, T (Helsinki U.) ; Junninen, H (Helsinki U.) ; Adamov, A (Helsinki U.) ; Amorim, A (SIM, University of Lisbon ; Beira Interior U., Covilha) ; Dommen, J (PSI, Villigen) et al.
This study presents the difference between oxidised organic compounds formed by α-pinene oxidation under various conditions in the CLOUD environmental chamber: (1) pure ozonolysis (in the presence of hydrogen as hydroxyl radical (OH) scavenger) and (2) OH oxidation (initiated by nitrous acid (HONO) photolysis by ultraviolet light) in the absence of ozone. We discuss results from three Atmospheric Pressure interface Time-of-Flight (APi-TOF) mass spectrometers measuring simultaneously the composition of naturally charged as well as neutral species (via chemical ionisation with nitrate). [...]
2015 - 15 p. - Published in : Atmosph. Chem. Phys. 15 (2015) 4145-4159 Fulltext: PDF;

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2017-06-13
06:17
Experimental investigation of ion–ion recombination under atmospheric conditions / Franchin, A (Helsinki U.) ; Ehrhart, S (CERN ; Goethe U., Frankfurt (main)) ; Leppä, J (Finnish Meteorological Inst. ; Caltech, Eng. Appl. Sci.) ; Nieminen, T (Helsinki U.) ; Gagné, S (Dalhousie U. ; York U., Canada) ; Schobesberger, S (Helsinki U.) ; Wimmer, D (Helsinki U.) ; Duplissy, J (Helsinki U.) ; Riccobono, F (PSI, Villigen) ; Dunne, E M (Finnish Meteorological Inst.) et al.
We present the results of laboratory measurements of the ion–ion recombination coefficient at different temperatures, relative humidities and concentrations of ozone and sulfur dioxide. The experiments were carried out using the Cosmics Leaving OUtdoor Droplets (CLOUD) chamber at CERN, the walls of which are made of conductive material, making it possible to measure small ions. [...]
2015 - 14 p. - Published in : Atmosph. Chem. Phys. 15 (2015) 7203-7216 Fulltext: PDF;

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