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1.
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Molecular Understanding of the Enhancement in Organic Aerosol Mass at High Relative Humidity
/ Surdu, Mihnea ; Lamkaddam, Houssni ; Wang, Dongyu S ; Bell, David M ; Xiao, Mao ; Lee, Chuan Ping ; Li, Dandan ; Caudillo, Lucía ; Marie, Guillaume ; Scholz, Wiebke et al.
The mechanistic pathway by which high relative humidity (RH) affects gas–particle partitioning remains poorly understood, although many studies report increased secondary organic aerosol (SOA) yields at high RH. Here, we use real-time, molecular measurements of both the gas and particle phase to provide a mechanistic understanding of the effect of RH on the partitioning of biogenic oxidized organic molecules (from α-pinene and isoprene) at low temperatures (243 and 263 K) at the CLOUD chamber at CERN. [...]
2023 - 13 p.
- Published in : Environ. Sci. Technol. 57 (2023) 2297-2309
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An intercomparison study of four different techniques for measuring the chemical composition of nanoparticles
/ Caudillo, Lucía (Frankfurt U., FIAS ; Frankfurt U.) ; Surdu, Mihnea (PSI, Villigen) ; Lopez, Brandon (Carnegie Mellon U.) ; Wang, Mingyi (Carnegie Mellon U. ; Caltech) ; Thoma, Markus (Frankfurt U., FIAS ; Frankfurt U.) ; Bräkling, Steffen (LLNL, Livermore) ; Buchholz, Angela (Aalto U.) ; Simon, Mario (Frankfurt U., FIAS ; Frankfurt U.) ; Wagner, Andrea C (Frankfurt U., FIAS ; Frankfurt U.) ; Müller, Tatjana (Frankfurt U., FIAS ; Frankfurt U. ; Mainz, Max Planck Inst.) et al.
Currently, the complete chemical characterization of nanoparticles
(< 100 nm) represents an analytical challenge, since these particles
are abundant in number but have negligible mass. Several methods for
particle-phase characterization have been recently developed to better
detect and infer more accurately the sources and fates of sub-100 nm
particles, but a detailed comparison of different approaches is missing.
Here we report on the chemical composition of secondary organic aerosol
(SOA) nanoparticles from experimental studies of α-pinene ozonolysis
at −50, −30, and −10 ∘C and intercompare the results measured by different
techniques. [...]
2023 - 19 p.
- Published in : Atmos. Chem. Phys. 23 (2023) 6613-6631
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3.
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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
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4.
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Role of sesquiterpenes in biogenic new particle formation
/ Dada, Lubna (PSI, Villigen ; Helsinki U.) ; Stolzenburg, Dominik (Helsinki U. ; Vienna U. ; TU Vienna) ; Simon, Mario (Frankfurt U.) ; Fischer, Lukas (Innsbruck U.) ; Heinritzi, Martin (Frankfurt U.) ; Wang, Mingyi (Carnegie Mellon U. ; Caltech) ; Xiao, Mao (PSI, Villigen) ; Vogel, Alexander L (Frankfurt U.) ; Ahonen, Lauri (Helsinki U.) ; Amorim, Antonio (Lisbon U.) et al.
Biogenic vapors form new particles in the atmosphere, affecting global climate. The contributions of monoterpenes and isoprene to new particle formation (NPF) have been extensively studied. [...]
2023 - 14 p.
- Published in : Sci. Adv. 9 (2023) adi5297
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5.
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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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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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7.
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High Gas-Phase Methanesulfonic Acid Production in the OH-Initiated Oxidation of Dimethyl Sulfide at Low Temperatures
/ Shen, Jiali ; Scholz, Wiebke ; He, Xu-Cheng ; Zhou, Putian ; Marie, Guillaume ; Wang, Mingyi ; Marten, Ruby ; Surdu, Mihnea ; Rörup, Birte ; Baalbaki, Rima et al.
Dimethyl sulfide (DMS) influences climate via cloud condensation nuclei (CCN) formation resulting from its oxidation products (mainly
methanesulfonic acid, MSA, and sulfuric acid, H2SO4). Despite their importance,
accurate prediction of MSA and H2SO4 from DMS oxidation remains
challenging. [...]
2022 - 14 p.
- Published in : Environ. Sci. Technol. 56 (2022) 13931-13944
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8.
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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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10.
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Synergistic HNO$_{3}$–H$_{2}$SO$_{4}$–NH$_{3}$ upper tropospheric particle formation
/ Wang, Mingyi ; Xiao, Mao ; Bertozzi, Barbara ; Marie, Guillaume ; Rörup, Birte ; Schulze, Benjamin ; Bardakov, Roman ; He, Xu-Cheng ; Shen, Jiali ; Scholz, Wiebke et al.
New particle formation in the upper free troposphere is a major global source of cloud condensation nuclei (CCN). However, the precursor vapours that drive the process are not well understood. [...]
2022 - 7 p.
- Published in : Nature 605 (2022) 483-489
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