CERN Accelerating science

CLOUD Papers

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2016-05-30
16:50
The role of low-volatility organic compounds in initial particle growth in the atmosphere / Tröstl, Jasmin (PSI, Villigen) ; Chuang, Wayne K (Carnegie Mellon U. (main)) ; Gordon, Hamish (CERN) ; Heinritzi, Martin (Goethe U., Frankfurt (main)) ; Yan, Chao (Helsinki U.) ; Molteni, Ugo (PSI, Villigen) ; Ahlm, Lars (Stockholm U. (main)) ; Frege, Carla (PSI, Villigen) ; Bianchi, Federico (PSI, Villigen ; Helsinki U. ; ETH, Zurich (main)) ; Wagner, Robert (Helsinki U.) et al.
About half of present-day cloud condensation nuclei originate from atmospheric nucleation, frequently appearing as a burst of new particles near midday. Atmospheric observations show that the growth rate of new particles often accelerates when the diameter of the particles is between one and ten nanometres. [...]
2016 - Published in : Nature 533 (2016) 527-531 NPG Open Access article: PDF;

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2016-05-30
15:23
Ion-induced nucleation of pure biogenic particles / Kirkby, Jasper (Goethe U., Frankfurt (main) ; CERN) ; Duplissy, Jonathan (Helsinki U. ; Helsinki Inst. of Phys.) ; Sengupta, Kamalika (U. Leeds (main)) ; Frege, Carla (PSI, Villigen) ; Gordon, Hamish (CERN) ; Williamson, Christina (Goethe U., Frankfurt (main)) ; Heinritzi, Martin (Goethe U., Frankfurt (main) ; Innsbruck U.) ; Simon, Mario (Goethe U., Frankfurt (main)) ; Yan, Chao (Helsinki U.) ; Almeida, João (Goethe U., Frankfurt (main) ; CERN) et al.
Atmospheric aerosols and their effect on clouds are thought to be important for anthropogenic radiative forcing of the climate, yet remain poorly understood. Globally, around half of cloud condensation nuclei originate from nucleation of atmospheric vapours. [...]
2016 - Published in : Nature 533 (2016) 521-526 NPG Open Access article: PDF;

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2014-11-26
10:21
On the derivation of particle nucleation rates from experimental formation rates / Kürten, A (Goethe U., Frankfurt (main)) ; Williamson, C (Goethe U., Frankfurt (main)) ; Almeida, J (CERN) ; Kirkby, J (Goethe U., Frankfurt (main) ; CERN) ; Curtius, J (Goethe U., Frankfurt (main))
Atmospheric particle formation rates are usually measured at sizes larger than the critical size where nucleation occurs. Due to loss of particles during their growth to the detection threshold, the measured formation rate is often substantially smaller than the nucleation rate. [...]
2014 - Published in : Atmos. Chem. Phys. Discuss. 14 (2014) 27233-27261

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2014-11-26
10:12
Technical Note: Using DEG CPCs at upper tropospheric temperatures / Wimmer, D (Goethe U., Frankfurt (main) ; Helsinki U.) ; Lehtipalo, K (Helsinki U. ; Airmodus, 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)) ; Manninen, H E (Helsinki U.) et al.
Over the last few years, several Condensation Particle Counters (CPC) capable of measuring in the sub-3 nm size range have been developed. Here we study the performance of Diethylene glycol (DEG) based CPCs at different temperatures during Cosmics Leaving Outdoor Droplets (CLOUD) measurements at CERN. [...]
2014 - Published in : Atmos. Chem. Phys. Discuss. 14 (2014) 12797-12817

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2014-11-26
09:56
On the composition of ammonia-sulfuric acid 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. ; Helsinki U. ; CERN) ; Kürten, A (Goethe U., Frankfurt (main)) ; Ortega, I K (Helsinki U. ; PhLAM, Villeneuve d'Ascq) ; Metzger, A (Ionicon Analytik, 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. [...]
2014 - Published in : Atmos. Chem. Phys. Discuss. 14 (2014) 13413-13464

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2014-11-26
09:49
Effect of ions on the measurement of sulphuric 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., with and without the presence of ions, were carried out under precisely controlled conditions. [...]
2014 - Published in : Atmos. Meas. Tech. Discuss. 7 (2014) 6595-6624

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2014-11-26
09:40
Numerical simulations of mixing conditions and aerosol dynamics in the CERN CLOUD chamber / Voigtländer, J (TROPOS, Leibniz) ; Duplissy, J (CERN ; Helsinki U.) ; Rondo, L (Goethe U., Frankfurt (main)) ; Kürten, A (Goethe U., Frankfurt (main)) ; Stratmann, F (TROPOS, Leibniz)
To study the effect of galactic cosmic rays on aerosols and clouds, the Cosmics Leaving OUtdoor Droplets (CLOUD) project was established. Experiments are carried out at a 26.1 m3 tank at CERN (Switzerland). [...]
2012 - Published in : Atmos. Chem. Phys. 12 (2012) 2205-2214

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2014-11-26
09:36
Dimethylamine and ammonia measurements with ion chromatography during the CLOUD4 campaign / Praplan, A P (PSI, Villigen) ; Bianchi, F (PSI, Villigen) ; Dommen, J (PSI, Villigen) ; Baltensperger, U (PSI, Villigen)
The CLOUD project investigates the influence of galactic cosmic rays on the nucleation of new particles in an environmental chamber at CERN. Dimethylamine (DMA) was injected intentionally into the CLOUD chamber to reach atmospherically relevant levels away from sources (up to 100 pptv) in order to study its effect on nucleation with sulphuric acid and water at 278 K. [...]
2012 - Published in : Atmos. Meas. Tech. 5 (2012) 2161-2167

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2014-11-26
09:31
On-line determination of ammonia at low pptv mixing ratios in the CLOUD chamber / Bianchi, F (PSI, Villigen) ; Dommen, J (PSI, Villigen) ; Mathot, S (CERN) ; Baltensperger, U (PSI, Villigen)
A new instrument for the on-line determination of ammonia was developed. Since ammonia is a rather sticky compound, sampling losses were minimised with a new sam- pling device where the ammonia was transferred to the liq- uid phase only 5 mm after the inlet tip. [...]
2012 - Published in : Atmos. Meas. Tech. 5 (2012) 1719-1725

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2014-11-26
09:21
Performance of diethylene glycol-based particle counters in the sub-3 nm size range / Wimmer, D (Goethe U., Frankfurt (main)) ; Lehtipalo, K (Helsinki U. ; Airmodus, Helsinki) ; Franchin, A (Helsinki U.) ; Kangasluoma, J (Helsinki U.) ; Kreissl, F (Goethe U., Frankfurt (main)) ; Kürten, A (Goethe U., Frankfurt (main)) ; Kupc, A (U. Vienna (main)) ; Metzger, A (Goethe U., Frankfurt (main)) ; Mikkilä, J (Airmodus, Helsinki) ; Petäjä, J (Helsinki U.) et al.
When studying new particle formation, the uncertainty in determining the "true" nucleation rate is considerably reduced when using condensation particle counters (CPCs) capable of measuring concentrations of aerosol particles at sizes close to or even at the critical cluster size (1–2 nm). Recently, CPCs able to reliably detect particles below 2 nm in size and even close to 1 nm became available. [...]
2013 - Published in : Atmos. Meas. Tech. 6 (2013) 1793-1804

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