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CERN Document Server Encontrados 2,036 registros  1 - 10siguientefinal  ir al registro: La búsqueda tardó 0.46 segundos. 
1.
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Experimental particle formation rates spanning tropospheric sulfuric acid and ammonia abundances, ion production rates, and temperatures / Kürten, Andreas ; Bianchi, Federico ; Almeida, Joao (CERN) ; Kupiainen-Määttä, Oona ; Dunne, Eimear M. ; Duplissy, Jonathan (CERN) ; Williamson, Christina ; Barmet, Peter ; Breitenlechner, Martin ; Dommen, Josef et al.
Binary nucleation of sulfuric acid and water as well as ternary nucleation involving ammonia arethought to be the dominant processes responsible for new particle formation (NPF) in the cold temperaturesof the middle and upper troposphere. Ions are also thought to be important for particle nucleation inthese regions. [...]
2016 - 24 p. - Published in : J. Geophys. Res. Atmos. 121 (2016) 12,377-12,400
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2.
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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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3.
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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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4.
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Global atmospheric particle formation from CERN CLOUD measurements / Dunne, E M (Leeds U.) ; Gordon, H (CERN) ; Kurten, A ; Almeida, J ; Duplissy, J ; Williamson, C ; Ortega, I K ; Pringle, K J ; Adamov, A ; Baltensperger, U et al. /CLOUD
Fundamental questions remain about the origin of newly formed atmospheric aerosol particles because data from laboratory measurements have been insufficient to build global models. In contrast, gas-phase chemistry models have been based on laboratory kinetics measurements for decades. [...]
2016 - 6 p. - Published in : Science 354 (2016) 1119-1124
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5.
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New particle formation in the sulfuric acid–dimethylamine–water system: reevaluation of CLOUD chamber measurements and comparison to an aerosol nucleation and growth model / Kürten, Andreas (Goethe U., Frankfurt (main)) ; Li, Chenxi (Minnesota U.) ; Bianchi, Federico (U. Helsinki (main)) ; Curtius, Joachim (Goethe U., Frankfurt (main)) ; Dias, António (U. Lisbon (main)) ; Donahue, Neil M (Carnegie Mellon U. (main)) ; Duplissy, Jonathan (U. Helsinki (main)) ; Flagan, Richard C (Caltech) ; Hakala, Jani (U. Helsinki (main)) ; Jokinen, Tuija (U. Helsinki (main)) et al.
A recent CLOUD (Cosmics Leaving OUtdoor Droplets) chamber study showed that sulfuric acid and dimethylamine produce new aerosols very efficiently and yield particle formation rates that are compatible with boundary layer observations. These previously published new particle formation (NPF) rates are reanalyzed in the present study with an advanced method. [...]
2018 - 19 p. - Published in : Atmos. Chem. Phys. 18 (2018) 845-863 Fulltext: PDF; External link: Fulltext
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6.
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The driving factors of new particle formation and growth in the polluted boundary layer / Xiao, Mao ; Hoyle, Christopher R ; Dada, Lubna ; Stolzenburg, Dominik ; Kürten, Andreas ; Wang, Mingyi ; Lamkaddam, Houssni ; Garmash, Olga ; Mentler, Bernhard ; Molteni, Ugo et al.
New particle formation (NPF) is a significant source of atmospheric particles, affecting climate and air quality. Understanding the mechanisms involved in urban aerosols is important to develop effective mitigation strategies. [...]
2021 - 17 p. - Published in : Atmos. Chem. Phys. 21 (2021) 14275-14291 Fulltext: PDF; Supplement: PDF;
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7.
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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
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8.
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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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9.
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Comparison of the SAWNUC model with CLOUD measurements of sulphuric acid-water nucleation / Ehrhart, Sebastian (CERN) ; Ickes, Luisa ; Almeida, Joao (CERN) ; Amorim, Antonio ; Barmet, Peter ; Bianchi, Federico ; Dommen, Josef ; Dunne, Eimear M ; Duplissy, Jonathan ; Franchin, Alessandro et al.
Binary nucleation of sulphuric acid-water particles is expected to be an important process in the free troposphere at low temperatures. SAWNUC (Sulphuric Acid Water Nucleation) is a model of binary nucleation that is based on laboratory measurements of the binding energies of sulphuric acid and water in charged and neutral clusters. [...]
2016 - 15 p. - Published in : J. Geophys. Res. Atmos. 121 (2016) 12,401-12,414
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10.
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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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