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1.
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Modelling the gas–particle partitioning and water uptake of isoprene-derived secondary organic aerosol at high and low relative humidity
/ Amaladhasan, Dalrin Ampritta (McGill U.) ; Heyn, Claudia (PSI, Villigen) ; Hoyle, Christopher R (PSI, Villigen ; Zurich, ETH) ; Haddad, Imad El (PSI, Villigen) ; Elser, Miriam (PSI, Villigen) ; Pieber, Simone M (PSI, Villigen ; EMPA, Dubendorf) ; Slowik, Jay G (PSI, Villigen) ; Amorim, Antonio (Lisbon U.) ; Duplissy, Jonathan (Helsinki U. ; Helsinki Inst. of Phys.) ; Ehrhart, Sebastian (CERN ; Helsinki U.) et al.
Abstract. This study presents a characterization of the hygroscopic growth behaviour and effects of different inorganic seed particles on the formation of secondary organic aerosols (SOAs) from the dark ozone-initiated oxidation of isoprene at low NOx conditions [...]
2022 - 30 p.
- Published in : Atmos. Chem. Phys. 22 (2022) 215-244
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2.
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Enhanced growth rate of atmospheric particles from sulfuric acid
/ Stolzenburg, Dominik (Vienna U. ; Helsinki U.) ; Simon, Mario (Frankfurt U.) ; Ranjithkumar, Ananth (Leeds U.) ; Kürten, Andreas (Frankfurt U.) ; Lehtipalo, Katrianne (Helsinki U. ; Finnish Meteorological Inst.) ; Gordon, Hamish (Leeds U.) ; Ehrhart, Sebastian (Mainz, Max Planck Inst.) ; Finkenzeller, Henning (U. Colorado, Boulder) ; Pichelstorfer, Lukas (Helsinki U.) ; Nieminen, Tuomo (Helsinki U.) et al.
In the present-day atmosphere, sulfuric acid is the
most important vapour for aerosol particle formation and initial growth. However, the growth rates of nanoparticles ( <
10 nm) from sulfuric acid remain poorly measured. [...]
2020 - 14 p.
- Published in : Atmos. Chem. Phys. 20 (2020) 7359-7372
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3.
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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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4.
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Evaporation of sulfate aerosols at low relative humidity
/ Tsagkogeorgas, Georgios (TROPOS, Leibniz) ; Roldin, Pontus (Helsinki U. ; Lund U.) ; Duplissy, Jonathan (Helsinki U. ; Helsinki Inst. of Phys.) ; Rondo, Linda (Goethe U., Frankfurt (main)) ; Tröstl, Jasmin (PSI, Villigen) ; Slowik, Jay G (PSI, Villigen) ; Ehrhart, Sebastian (Goethe U., Frankfurt (main)) ; Franchin, Alessandro (Helsinki U.) ; Kürten, Andreas (Goethe U., Frankfurt (main)) ; Amorim, Antonio (Lisbon, CENTRA) et al.
Evaporation of sulfuric acid from particles can be important in the atmospheres of Earth and Venus. However, the equilibrium constant for the dissociation of H2SO4 to bisulfate ions, which is the one of the fundamental parameters controlling the evaporation of sulfur particles, is not well constrained. [...]
2017 - 16 p.
- Published in : Atmos. Chem. Phys. 17 (2017) 8923-8938
External link: Fulltext
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5.
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Measurement–model comparison of stabilized Criegee intermediate and highly oxygenated molecule production in the CLOUD chamber
/ Sarnela, Nina (U. Helsinki (main)) ; Jokinen, Tuija (U. Helsinki (main)) ; Duplissy, Jonathan (U. Helsinki (main)) ; Yan, Chao (U. Helsinki (main)) ; Nieminen, Tuomo (UEF, Kuopio) ; Ehn, Mikael (U. Helsinki (main)) ; Schobesberger, Siegfried (U. Helsinki (main) ; UEF, Kuopio ; U. Washington, Seattle (main)) ; Heinritzi, Martin (Goethe U., Frankfurt (main)) ; Ehrhart, Sebastian (Goethe U., Frankfurt (main)) ; Lehtipalo, Katrianne (U. Helsinki (main) ; PSI, Villigen) et al.
Atmospheric oxidation is an important phenomenon which produces large quantities of low-volatility compounds such as sulfuric acid and oxidized organic compounds. Such species may be involved in the nucleation of particles and enhance their subsequent growth to reach the size of cloud condensation nuclei (CCN). [...]
2018 - 18 p.
- Published in : Atmos. Chem. Phys. 18 (2018) 2363-2380
Fulltext: PDF; External link: Fulltext
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6.
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Temperature uniformity in the CERN CLOUD chamber
/ Dias, António (CERN) ; Ehrhart, Sebastian (CERN ; Mainz, Max Planck Inst.) ; Vogel, Alexander (CERN ; PSI, Villigen) ; Williamson, Christina (Goethe U., Frankfurt (main) ; Colorado U., CIRES) ; Almeida, João (CERN ; Goethe U., Frankfurt (main)) ; Kirkby, Jasper (CERN ; Goethe U., Frankfurt (main)) ; Mathot, Serge (CERN) ; Mumford, Samuel (CERN) ; Onnela, Antti (CERN)
The CLOUD (Cosmics Leaving OUtdoor Droplets) experiment at CERN (European Council for Nuclear Research) investigates the nucleation and growth of aerosol particles under atmospheric conditions and their activation into cloud droplets. A key feature of the CLOUD experiment is precise control of the experimental parameters. [...]
2017 - 14 p.
- Published in : Atmos. Meas. Tech. 10 (2017) 5075-5088
Fulltext: PDF; External link: Fulltext
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7.
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Influence of temperature on the molecular composition of ions and charged clusters during pure biogenic nucleation
/ Frege, Carla (PSI, Villigen) ; Ortega, Ismael K ; Rissanen, Matti P ; Praplan, Arnaud P ; Steiner, Gerhard ; Heinritzi, Martin ; Ahonen, Lauri ; Amorim, António ; Bernhammer, Anne-Kathrin ; Bianchi, Federico et al.
It was recently shown by the CERN CLOUD experiment that biogenic highly oxygenated molecules (HOMs) form particles under atmospheric conditions in the absence of sulfuric acid, where ions enhance the nucleation rate by 1–2 orders of magnitude. The biogenic HOMs were produced from ozonolysis of α-pinene at 5 °C. [...]
2018 - 15 p.
- Published in : Atmos. Chem. Phys. 18 (2018) 65-79
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8.
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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
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9.
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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
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10.
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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
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