CERN Accelerating science

CLOUD Papers

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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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2017-06-13
06:17
Technical Note: Using DEG-CPCs at upper tropospheric temperatures / Wimmer, D (Goethe U., Frankfurt (main) ; Helsinki U.) ; Lehtipalo, K (Helsinki U. ; Airmodus Ltd, Helsinki) ; Nieminen, T (Helsinki U.) ; Duplissy, J (Helsinki U.) ; Ehrhart, S (Goethe U., Frankfurt (main) ; CERN) ; Almeida, J (Goethe U., Frankfurt (main) ; CERN) ; Rondo, L (Goethe U., Frankfurt (main)) ; Franchin, A (Helsinki U.) ; Kreissl, F (Goethe U., Frankfurt (main)) ; Bianchi, F (PSI, Villigen ; Zurich, ETH) et al.
Over the last few years, several condensation particle counters (CPCs) capable of measuring in the sub-3 nm size range have been developed. Here we study the performance of CPCs based on diethylene glycol (DEG) at different temperatures during Cosmics Leaving OUtdoor Droplets (CLOUD) measurements at CERN. [...]
2015 - 9 p. - Published in : Atmosph. Chem. Phys. 15 (2015) 7547-7555 Fulltext: PDF;

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2017-06-13
06:17
Thermodynamics of the formation of sulfuric acid dimers in the binary (H2SO4–H2O) and ternary (H2SO4–H2O–NH3) system / Kürten, A (Goethe U., Frankfurt (main)) ; Münch, S (Goethe U., Frankfurt (main)) ; Rondo, L (Goethe U., Frankfurt (main)) ; Bianchi, F (PSI, Villigen ; Zurich, ETH) ; Duplissy, J (CERN) ; Jokinen, T (Helsinki U.) ; Junninen, H (Helsinki U.) ; Sarnela, N (Helsinki U.) ; Schobesberger, S (Helsinki U.) ; Simon, M (Goethe U., Frankfurt (main)) et al.
Sulfuric acid is an important gas influencing atmospheric new particle formation (NPF). Both the binary $(H_2SO_4–H_2O)$ system and the ternary system involving ammonia $(H_2SO_4–H_2O–NH_3)$ may be important in the free troposphere. [...]
2015 - 21 p. - Published in : Atmosph. Chem. Phys. 15 (2015) 10701-10721 Fulltext: PDF;

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2017-06-13
06:17
Effect of ions on the measurement of sulfuric acid in the CLOUD experiment at CERN / Rondo, L (Goethe U., Frankfurt (main)) ; Kürten, A (Goethe U., Frankfurt (main)) ; Ehrhart, S (Goethe U., Frankfurt (main)) ; Schobesberger, S (Helsinki U.) ; Franchin, A (Helsinki U.) ; Junninen, H (Helsinki U.) ; Petäjä, T (Helsinki U.) ; Sipilä, M (Helsinki U.) ; Worsnop, D R (Helsinki U. ; Aerodyne Research, Billerica) ; Curtius, J (Goethe U., Frankfurt (main))
Ternary aerosol nucleation experiments were conducted in the CLOUD chamber at CERN in order to investigate the influence of ions on new particle formation. Neutral and ion-induced nucleation experiments, i.e. [...]
2014 - 11 p. - Published in : Atmosph. Meas. Tech. 7 (2014) 3849-3859 INSPIRE-PUBLIC: PDF;

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2017-06-13
06:17
Modeling the thermodynamics and kinetics of sulfuric acid-dimethylamine-water nanoparticle growth in the CLOUD chamber / Ahlm, L (ACES, Stockholm University) ; Yli-Juuti, T (UEF, Kuopio) ; Schobesberger, S (Helsinki U. ; Washington U., Seattle) ; Praplan, A P (Helsinki U.) ; Kim, J (UEF, Kuopio) ; Tikkanen, O -P (UEF, Kuopio ; Helsinki U.) ; Lawler, M J (UC, Irvine) ; Smith, J N (UEF, Kuopio ; UC, Irvine) ; Tröstl, J (PSI, Villigen) ; Acosta Navarro, J C (ACES, Stockholm University) et al.
Dimethylamine (DMA) has a stabilizing effect on sulfuric acid (SA) clusters, and the SA and DMA molecules and clusters likely play important roles in both aerosol particle formation and growth in the atmosphere. We use the monodisperse particle growth model for acid-base chemistry in nanoparticle growth (MABNAG) together with direct and indirect observations from the CLOUD4 and CLOUD7 experiments in the cosmics leaving outdoor droplets (CLOUD) chamber at CERN to investigate the size and composition evolution of freshly formed particles consisting of SA, DMA, and water as they grow to 20 nm in dry diameter [...]
2016 - 16 p. - Published in : Aerosol Sci. Technol. 50 (2016) 1017-1032

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2017-06-10
06:48
Aqueous phase oxidation of sulphur dioxide by ozone in cloud droplets / Hoyle, C R (PSI, Villigen ; Davos Observ.) ; Fuchs, C (PSI, Villigen) ; Järvinen, E (KIT, Karlsruhe) ; Saathoff, H (KIT, Karlsruhe) ; Dias, A (CERN) ; El Haddad, I (PSI, Villigen) ; Gysel, M (PSI, Villigen) ; Coburn, S C (Colorado U., CIRES) ; Tröstl, J (PSI, Villigen) ; Bernhammer, A -K (Innsbruck U. ; Ionicon Analytik GmbH, Innsbruck) et al.
The growth of aerosol due to the aqueous phase oxidation of sulfur dioxide by ozone was measured in laboratory-generated clouds created in the Cosmics Leaving OUtdoor Droplets (CLOUD) chamber at the European Organization for Nuclear Research (CERN). Experiments were performed at 10 and −10 °C, on acidic (sulfuric acid) and on partially to fully neutralised (ammonium sulfate) seed aerosol. [...]
2016 - 20 p. - Published in : Atmosph. Chem. Phys. 16 (2016) 1693-1712 Fulltext: PDF;

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2017-06-10
06:48
Hygroscopicity of nanoparticles produced from homogeneous nucleation in the CLOUD experiments / Kim, J (UEF, Kuopio) ; Ahlm, L (Stockholm U.) ; Yli-Juuti, T (UEF, Kuopio) ; Lawler, M (UEF, Kuopio ; NCAR, Boulder) ; Keskinen, H (UEF, Kuopio) ; Tröstl, J (PSI, Villigen) ; Schobesberger, S (Helsinki U.) ; Duplissy, J (Helsinki U.) ; Amorim, A (Lisbon, CENTRA) ; Bianchi, F (PSI, Villigen ; Zurich, ETH) et al.
Sulfuric acid, amines and oxidized organics have been found to be important compounds in the nucleation and initial growth of atmospheric particles. Because of the challenges involved in determining the chemical composition of objects with very small mass, however, the properties of the freshly nucleated particles and the detailed pathways of their formation processes are still not clear. [...]
2016 - 12 p. - Published in : Atmosph. Chem. Phys. 16 (2016) 293-304 Fulltext: PDF;

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2017-06-10
06:48
Observation of viscosity transition in α-pinene secondary organic aerosol / Järvinen, Emma (KIT, Karlsruhe) ; Ignatius, Karoliina (TROPOS, Leibniz) ; Nichman, Leonid (Manchester U.) ; Kristensen, Thomas B (TROPOS, Leibniz) ; Fuchs, Claudia (PSI, Villigen) ; Hoyle, Christopher R (PSI, Villigen ; Davos Observ.) ; Höppel, Niko (KIT, Karlsruhe) ; Corbin, Joel C (PSI, Villigen) ; Craven, Jill (Caltech) ; Duplissy, Jonathan (Helsinki U.) et al.
Under certain conditions, secondary organic aerosol (SOA) particles can exist in the atmosphere in an amorphous solid or semi-solid state. To determine their relevance to processes such as ice nucleation or chemistry occurring within particles requires knowledge of the temperature and relative humidity (RH) range for SOA to exist in these states. [...]
2016 - 16 p. - Published in : Atmosph. Chem. Phys. 16 (2016) 4423-4438 Fulltext: PDF;

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