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Iodine oxoacids enhance nucleation of sulfuric acid particles in the atmosphere
/ He, Xu-Cheng (Helsinki U. ; Carnegie Mellon U. ; Helsinki Inst. of Phys.) ; Simon, Mario (Frankfurt U., FIAS ; Frankfurt U.) ; Iyer, Siddharth (Tampere U. of Tech.) ; Xie, Hong-Bin (Shanghai Jiao Tong U.) ; Rörup, Birte (Helsinki U.) ; Shen, Jiali (Helsinki U.) ; Finkenzeller, Henning (Colorado U. ; Colorado U., CIRES) ; Stolzenburg, Dominik (Helsinki U. ; Vienna U.) ; Zhang, Rongjie (Shanghai Jiao Tong U.) ; Baccarini, Andrea (PSI, Villigen ; Ecole Polytechnique, Lausanne) et al.
The main nucleating vapor in the atmosphere is thought to be sulfuric acid (H2SO4), stabilized by ammonia (NH3). However, in marine and polar regions, NH3 is generally low, and H2SO4 is frequently found together with iodine oxoacids [HIOx, i.e., iodic acid (HIO3) and iodous acid (HIO2)]. [...]
2023 - 7 p.
- Published in : Science 382 (2023) adh2526
Manuscript: PDF;
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2.
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Role of iodine oxoacids in atmospheric aerosol nucleation
/ He, Xu-Cheng (Helsinki U.) ; Tham, Yee Jun (Helsinki U.) ; Dada, Lubna (Helsinki U.) ; Wang, Mingyi (Carnegie Mellon U.) ; Finkenzeller, Henning (U. Colorado, Boulder) ; Stolzenburg, Dominik (Vienna U. ; Helsinki U.) ; Iyer, Siddharth (Tampere U. of Tech.) ; Simon, Mario (Frankfurt U., FIAS) ; Kürten, Andreas (Frankfurt U., FIAS) ; Shen, Jiali (Helsinki U.) et al.
Iodic acid (HIO3) is known to form aerosol particles in coastal marine regions, but predicted nucleation and growth rates are lacking. Using the CERN CLOUD (Cosmics Leaving Outdoor Droplets) chamber, we find that the nucleation rates of HIO3 particles are rapid, even exceeding sulfuric acid–ammonia rates under similar conditions. [...]
2021 - 7 p.
- Published in : Science 371 (2021) 589-595
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3.
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The gas-phase formation mechanism of iodic acid as an atmospheric aerosol source
/ Finkenzeller, Henning (Colorado U. ; Colorado U., CIRES) ; Iyer, Siddharth (Tampere U. of Tech.) ; He, Xu-Cheng (Helsinki U.) ; Simon, Mario (Goethe U., Frankfurt (main)) ; Koenig, Theodore K (Colorado U. ; Colorado U., CIRES ; Peking U., Beijing) ; Lee, Christopher F (Colorado U. ; Colorado U., CIRES) ; Valiev, Rashid (Helsinki U.) ; Hofbauer, Victoria (Carnegie Mellon U.) ; Amorim, Antonio (Lisbon U.) ; Baalbaki, Rima (Helsinki U.) et al.
AbstractIodine is a reactive trace element in atmospheric chemistry that destroys ozone and nucleates particles. Iodine emissions have tripled since 1950 and are projected to keep increasing with rising O3 surface concentrations. [...]
2022 - 7 p.
- Published in : Nature Chem. 15 (2022) 129-135
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Survival of newly formed particles in haze conditions
/ Marten, Ruby (PSI, Villigen) ; Xiao, Mao (PSI, Villigen) ; Rorup, Birte (Helsinki U.) ; Wang, Mingyi (Carnegie Mellon U.) ; Kong, Weimeng (Caltech) ; He, Xu-Cheng (Helsinki U.) ; Stolzenburg, Dominik (Helsinki U.) ; Pfeifer, Joschka (CERN ; Frankfurt U., FIAS ; Frankfurt U.) ; Marie, Guillaume (Frankfurt U., FIAS ; Frankfurt U.) ; Wang, Dongyu S (PSI, Villigen) et al.
Intense new particle formation events are regularly observed under highly polluted conditions, despite the high loss rates of nucleated clusters. Higher than expected cluster survival probability implies either ineffective scavenging by pre-existing particles or missing growth mechanisms. [...]
2022 - 9 p.
- Published in : Environmental Science: Atmospheres 2 (2022) 491-499
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Molecular characterization of ultrafine particles using extractive electrospray time-of-flight mass spectrometry
/ Surdu, Mihnea (PSI, Villigen) ; Pospisilova, Veronika (PSI, Villigen) ; Xiao, Mao (PSI, Villigen) ; Wang, Mingyi (Carnegie Mellon U.) ; Mentler, Bernhard (Innsbruck U.) ; Simon, Mario (Frankfurt U., FIAS ; Frankfurt U.) ; Stolzenburg, Dominik (Vienna U., Dept. Math. ; Helsinki U.) ; Hoyle, Christopher R (PSI, Villigen ; Zurich, ETH) ; Bell, David M (PSI, Villigen) ; Lee, Chuan Ping (PSI, Villigen) et al.
Aerosol particles negatively affect human health while also having climatic relevance due to, for example, their ability to act as cloud condensation nuclei. Ultrafine particles (diameter D$_p$ < 100 nm) typically comprise the largest fraction of the total number concentration, however, their chemical characterization is difficult because of their low mass. [...]
2021 - 15 p.
- Published in : Environmental Science: Atmospheres 1 (2021) 434-448
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Determination of the collision rate coefficient between charged iodic acid clusters and iodic acid using the appearance time method
/ He, Xu-Cheng (U. Helsinki (main)) ; Iyer, Siddharth (U. Helsinki (main)) ; Sipilä, Mikko (U. Helsinki (main)) ; Ylisirniö, Arttu (UEF, Kuopio) ; Peltola, Maija (Helsinki U.) ; Kontkanen, Jenni (Helsinki U.) ; Baalbaki, Rima (Helsinki U.) ; Simon, Mario (Goethe U., Frankfurt (main)) ; Kürten, Andreas (Goethe U., Frankfurt (main)) ; Tham, Yee Jun (Helsinki U.) et al.
Ions enhance the formation rate of atmospheric aerosol particles, which play an important role in Earth’s radiative balance. Ion-induced nucleation involves the stepwise accretion of neutral monomers onto a molecular cluster containing an ion, which helps to stabilize the cluster against evaporation. [...]
2020 - 12 p.
- Published in : Aerosol Sci. Technol. 55 (2020) 231-242
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NO at low concentration can enhance the formation of highly oxygenated biogenic molecules in the atmosphere
/ Nie, Wei (Nanjing U. (main) ; Unlisted, CN ; Helsinki U. ; SYRTE, Paris) ; Yan, Chao (Nanjing U. (main) ; Unlisted, CN ; Helsinki U. ; SYRTE, Paris) ; Yang, Liwen (Nanjing U. (main)) ; Roldin, Pontus (Khlopin Radium Inst. ; Malmo U.) ; Liu, Yuliang (Nanjing U. (main)) ; Vogel, Alexander L (Frankfurt U., FIAS ; Frankfurt U.) ; Molteni, Ugo (PSI, Villigen ; UC, Irvine (main) ; Unlisted, US) ; Stolzenburg, Dominik (Helsinki U. ; Vienna U.) ; Finkenzeller, Henning (Colorado U.) ; Amorim, Antonio (CMAF, Lisbon) et al.
The interaction between nitrogen monoxide (NO) and organic peroxy radicals (RO$_{2}$) greatly impacts the formation of highly oxygenated organic molecules (HOM), the key precursors of secondary organic aerosols. It has been thought that HOM production can be significantly suppressed by NO even at low concentrations. [...]
2023 - 11 p.
- Published in : Nature Commun. 14 (2023) 3347
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Measurement of the collision rate coefficients between atmospheric ions and multiply charged aerosol particles in the CERN CLOUD chamber
/ Pfeifer, Joschka (CERN ; Frankfurt U.) ; Mahfouz, Naser G A (Carnegie Mellon U. ; Princeton U.) ; Schulze, Benjamin C (Caltech) ; Mathot, Serge (CERN) ; Stolzenburg, Dominik (Helsinki U.) ; Baalbaki, Rima (Helsinki U.) ; Brasseur, Zoé (Helsinki U.) ; Caudillo, Lucia (Frankfurt U., FIAS ; Frankfurt U.) ; Dada, Lubna (PSI, Villigen) ; Granzin, Manuel (Frankfurt U., FIAS ; Frankfurt U.) et al.
Aerosol particles have an important role in Earth's
radiation balance and climate, both directly and indirectly through
aerosol–cloud interactions. Most aerosol particles in the atmosphere are
weakly charged, affecting both their collision rates with ions and neutral
molecules, as well as the rates by which they are scavenged by other aerosol
particles and cloud droplets. [...]
2023 - 16 p.
- Published in : Atmos. Chem. Phys. 23 (2023) 6703-6718
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New particle formation from isoprene under upper-tropospheric conditions
/ Shen, Jiali (Helsinki U.) ; Russell, Douglas M (Frankfurt U., FIAS) ; DeVivo, Jenna (Carnegie Mellon U.) ; Kunkler, Felix (Mainz, Max Planck Inst.) ; Baalbaki, Rima (Helsinki U.) ; Mentler, Bernhard (Innsbruck U.) ; Scholz, Wiebke (Innsbruck U.) ; Yu, Wenjuan (Helsinki U.) ; Caudillo-Plath, Lucía (Frankfurt U., FIAS) ; Sommer, Eva (CERN ; Vienna U.) et al.
Abstract
Aircraft observations have revealed ubiquitous new particle formation in the tropical upper troposphere over the Amazon1,2 and the Atlantic and Pacific oceans3,4. Although the vapours involved remain unknown, recent satellite observations have revealed surprisingly high night-time isoprene mixing ratios of up to 1 part per billion by volume (ppbv) in the tropical upper troposphere5. [...]
2024 - 9 p.
- Published in : Nature 636 (2024) 115-123
Fulltext: PDF; External link: Interactions.org
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10.
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Molecular Composition and Volatility of Nucleated Particles from $\alpha$-Pinene Oxidation between −50 °C and +25 °C
/ Ye, Qing (Carnegie Mellon U. (main)) ; Wang, Mingyi (Carnegie Mellon U. (main)) ; Hofbauer, Victoria (Carnegie Mellon U. (main)) ; Stolzenburg, Dominik (Vienna U.) ; Chen, Dexian (Carnegie Mellon U. (main)) ; Schervish, Meredith (Carnegie Mellon U. (main)) ; Vogel, Alexander (CERN ; Goethe U., Frankfurt (main)) ; Mauldin, Roy L (Carnegie Mellon U. (main) ; U. Colorado, Boulder) ; Baalbaki, Rima (U. Helsinki (main)) ; Brilke, Sophia (Vienna U.) et al.
We use a real-time temperature-programmed desorption chemical-ionization mass spectrometer (FIGAERO–CIMS) to measure particle-phase composition and volatility of nucleated particles, studying pure α-pinene oxidation over a wide temperature range (−50 °C to +25 °C) in the CLOUD chamber at CERN. Highly oxygenated organic molecules are much more abundant in particles formed at higher temperatures, shifting the compounds toward higher O/C and lower intrinsic (300 K) volatility. [...]
2019 - 9 p.
- Published in : Environmental Science & Technology 53 (2019) 12357-12365
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