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CLOUD Papers

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2018-04-06
06:04
An ultra-pure gas system for the CLOUD experiment at CERN / Guida, Roberto (CERN) ; Carrie, P (CERN) ; De Menezes, L (CERN) ; Duplissy, J (CERN) ; Fayet, F (CERN) ; Kirkby, J (CERN) ; Mathot, S (CERN) ; Minginette, P (CERN) ; Onnela, A (CERN) ; Rochez, J (CERN) et al.
The Cosmics Leaving Outdoor Droplets (CLOUD) experiment aims to recreate atmospheric conditions inside a large chamber where the mechanisms for the formation of aerosol and cloud are studied. Aerosol and cloud are recognized as representing the largest uncertainty in the current understanding of climate change together with the influence of the cosmic rays. [...]
2013 - 5 p. - Published in : 10.1109/NSSMIC.2012.6551298
In : 2012 IEEE Nuclear Science Symposium and Medical Imaging Conference, Anaheim, California, USA, 29 Oct - 3 Nov 2012, pp.1199-1203

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2018-04-06
06:04
Development of the gas system for the CLOUD experiment at CERN / Guida, R (CERN) ; Carrié, P (CERN) ; De Menezes, L (CERN) ; Duplissy, J (CERN) ; Fayet, F (CERN) ; Haider, S (CERN) ; Kirkby, J (CERN) ; Mathot, S (CERN) ; Minginette, P (CERN) ; Onnela, A (CERN) et al.
The Cosmics Leaving Outdoor Droplets (CLOUD) experiment aims to recreate atmospheric conditions inside a large chamber where the mechanisms for the formation of aerosol and cloud are studied. Aerosol and cloud are recognized as representing the largest uncertainty in the current understanding of climate change together with the influence of the cosmic rays. [...]
2014 - 5 p. - Published in : 10.1109/NSSMIC.2013.6829603
In : 2013 IEEE Nuclear Science Symposium and Medical Imaging Conference, Seoul, Korea, 26 Oct - 2 Nov 2013, pp.6829603

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2018-03-28
06:30
Performance of a corona ion source for measurement of sulfuric acid by chemical ionization mass spectrometry / Kürten, A (Goethe U., Frankfurt (main)) ; Rondo, L (Goethe U., Frankfurt (main)) ; Ehrhart, S (Goethe U., Frankfurt (main)) ; Curtius, J (Goethe U., Frankfurt (main))
The performance of an ion source based on corona discharge has been studied. This source is used for the detection of gaseous sulfuric acid by chemical ionization mass spectrometry (CIMS) through the reaction of NO3– ions with H2SO4. [...]
2011 - 7 p. - Published in : Atmos. Meas. Tech. 4 (2011) 437-443 Fulltext: PDF; External link: Fulltext

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2018-03-28
06:30
No statistically significant effect of a short-term decrease in the nucleation rate on atmospheric aerosols / Dunne, E M (U. Leeds (main) ; Finnish Meteorological Inst.) ; Lee, L A (U. Leeds (main)) ; Reddington, C L (U. Leeds (main)) ; Carslaw, K S (U. Leeds (main))
Observed correlations between short-term decreases in cosmic ray ionisation and cloud and aerosol properties have been attributed to short-term decreases in the ion-induced nucleation rate. We use a global aerosol microphysics model to determine whether a 10 day reduction of 15% in the nucleation rate could generate a statistically significant response in aerosol concentrations and optical properties. [...]
2012 - 15 p. - Published in : Atmos. Chem. Phys. 12 (2012) 11573-11587 Fulltext: PDF; External link: Fulltext

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2018-03-28
06:30
Calibration of a Chemical Ionization Mass Spectrometer for the Measurement of Gaseous Sulfuric Acid / Kürten, Andreas (Goethe U., Frankfurt (main)) ; Rondo, Linda (Goethe U., Frankfurt (main)) ; Ehrhart, Sebastian (Goethe U., Frankfurt (main)) ; Curtius, Joachim (Goethe U., Frankfurt (main))
The accurate measurement of the gaseous sulfuric acid concentration is crucial within many fields of atmospheric science. Instruments utilizing chemical ionization mass spectrometry (CIMS) measuring H2SO4, therefore, require a careful calibration. [...]
2012 - 12 p. - Published in : J. Phys. Chem. A 116 (2012) 6375-6386

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2018-03-28
06:30
Influence of aerosol lifetime on the interpretation of nucleation experiments with respect to the first nucleation theorem / Ehrhart, S (Goethe U., Frankfurt (main)) ; Curtius, J (Goethe U., Frankfurt (main))
The SAWNUC (Sulphuric Acid Water NUCleation) microphysical aerosol nucleation model is used to study the effect of reactor walls on the interpretation of nucleation experiments with respect to nucleation theory. This work shows that loss processes, such as wall losses, influence the interpretation of nucleation experiments, especially at low growth rates and short lifetimes of freshly nucleated particles. [...]
2013 - 7 p. - Published in : Atmosph. Chem. Phys. 13 (2013) 11465-11471 Fulltext: PDF; External link: Fulltext

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2018-03-28
06:30
A new high-transmission inlet for the Caltech nano-RDMA for size distribution measurements of sub-3 nm ions at ambient concentrations / Franchin, Alessandro (Helsinki U.) ; Downard, Andy (Caltech, Pasadena (main)) ; Kangasluoma, Juha (Helsinki U.) ; Nieminen, Tuomo (Helsinki U. ; Helsinki Inst. of Phys. ; UEF, Kuopio) ; Lehtipalo, Katrianne (Helsinki U. ; Airmodus Ltd, Helsinki) ; Steiner, Gerhard (U. Vienna (main) ; Innsbruck U.) ; Manninen, Hanna E (Helsinki U.) ; Petäjä, Tuukka (Helsinki U.) ; Flagan, Richard C (Caltech, Pasadena (main)) ; Kulmala, Markku (Helsinki U.)
Reliable and reproducible measurements of atmospheric aerosol particle number size distributions below 10 nm require optimized classification instruments with high particle transmission efficiency. Almost all differential mobility analyzers (DMAs) have an unfavorable potential gradient at the outlet (e.g., long column, Vienna type) or at the inlet (nano-radial DMA), preventing them from achieving a good transmission efficiency for the smallest nanoparticles. [...]
2016 - 12 p. - Published in : Atmos. Meas. Tech. 9 (2016) 2709-2720 Fulltext: PDF; External link: Fulltext

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2018-03-27
06:01
Characterization of the mass-dependent transmission efficiency of a CIMS / Heinritzi, Martin (Goethe U., Frankfurt (main)) ; Simon, Mario (Goethe U., Frankfurt (main)) ; Steiner, Gerhard (U. Vienna (main) ; Innsbruck U.) ; Wagner, Andrea C (Goethe U., Frankfurt (main)) ; Kürten, Andreas (Goethe U., Frankfurt (main)) ; Hansel, Armin (Innsbruck U.) ; Curtius, Joachim (Goethe U., Frankfurt (main))
Knowledge about mass discrimination effects in a chemical ionization mass spectrometer (CIMS) is crucial for quantifying, e.g., the recently discovered extremely low volatile organic compounds (ELVOCs) and other compounds for which no calibration standard exists so far. Here, we present a simple way of estimating mass discrimination effects of a nitrate-based chemical ionization atmospheric pressure interface time-of-flight (CI-APi-TOF) mass spectrometer. [...]
2016 - 12 p. - Published in : Atmos. Meas. Tech. 9 (2016) 1449-1460 Fulltext: PDF; External link: Fulltext

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2018-03-27
06:01
Detection of dimethylamine in the low pptv range using nitrate chemical ionization atmospheric pressure interface time-of-flight (CI-APi-TOF) mass spectrometry / Simon, Mario (Goethe U., Frankfurt (main)) ; Heinritzi, Martin (Goethe U., Frankfurt (main)) ; Herzog, Stephan (Goethe U., Frankfurt (main)) ; Leiminger, Markus (Goethe U., Frankfurt (main)) ; Bianchi, Federico (PSI, Villigen ; ETH, Zurich (main)) ; Praplan, Arnaud (Helsinki Inst. of Phys.) ; Dommen, Josef (PSI, Villigen) ; Curtius, Joachim (Goethe U., Frankfurt (main)) ; Kürten, Andreas (Goethe U., Frankfurt (main))
Amines are potentially important for atmospheric new particle formation, but their concentrations are usually low with typical mixing ratios in the pptv range or even smaller. Therefore, the demand for highly sensitive gas-phase amine measurements has emerged in the last several years. [...]
2016 - 11 p. - Published in : Atmos. Meas. Tech. 9 (2016) 2135-2145 Fulltext: PDF; External link: Fulltext

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2018-03-27
06:01
Can Highly Oxidized Organics Contribute to Atmospheric New Particle Formation? / Ortega, Ismael K (PhLAM, Villeneuve d'Ascq ; Carnegie Mellon U. (main)) ; Donahue, Neil M (Carnegie Mellon U. (main)) ; Kurtén, Theo (U. Helsinki (main)) ; Kulmala, Markku (Helsinki U.) ; Focsa, Cristian (PhLAM, Villeneuve d'Ascq) ; Vehkamäki, Hanna (Helsinki U.)
Highly oxidized organic molecules may play a critical role in new-particle formation within Earth’s atmosphere along with sulfuric acid, which has long been considered as a key compound in this process. Here we explore the interactions of these two partners, using quantum chemistry to find the formation free energies of heterodimers and trimers as well as the fastest evaporation rates of (2,2) tetramers. [...]
2015 - 7 p. - Published in : J. Phys. Chem. A 120 (2015) 1452-1458

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