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1.
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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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2.
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Roll vortices induce new particle formation bursts in the planetary boundary layer
/ Lampilahti, Janne (Helsinki U.) ; Manninen, Hanna Elina (CERN) ; Leino, Katri (Helsinki U.) ; Väänänen, Riikka (Helsinki U.) ; Manninen, Antti (Finnish Meteorological Inst.) ; Mazon, Stephany Buenrostro (Helsinki U.) ; Nieminen, Tuomo (Helsinki U.) ; Leskinen, Matti (Helsinki U.) ; Enroth, Joonas (Helsinki U.) ; Bister, Marja (Helsinki U.) et al.
Recent studies have shown the importance of new
particle formation (NPF) to global cloud condensation nuclei (CCN) production, as well as to air pollution in megacities. In addition to the necessary presence of low-volatility
vapors that can form new aerosol particles, both numerical
and observational studies have shown that the dynamics of
the planetary boundary layer (BL) plays an important role
in NPF. [...]
2020 - 14 p.
- Published in : Atmos. Chem. Phys. 20 (2020) 11841-11854
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3.
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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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4.
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Zeppelin-led study on the onset of new particle formation in the planetary boundary layer
/ Lampilahti, Janne (Helsinki U.) ; Manninen, Hanna E (CERN) ; Nieminen, Tuomo (Helsinki U.) ; Mirme, Sander (Tartu U.) ; Ehn, Mikael (Helsinki U.) ; Pullinen, Iida (Kuopio U.) ; Leino, Katri (Helsinki U.) ; Schobesberger, Siegfried (Helsinki U. ; Kuopio U.) ; Kangasluoma, Juha (Helsinki U.) ; Kontkanen, Jenni (Helsinki U.) et al.
We compared observations of aerosol particle formation and growth in different parts of the planetary boundary layer at two different environments that have frequent
new particle formation (NPF) events. In summer 2012 we
had a campaign in Po Valley, Italy (urban background), and
in spring 2013 a similar campaign took place in Hyytiälä,
Finland (rural background). [...]
2021 - 15 p.
- Published in : Atmos. Chem. Phys. 21 (2021) 12649-12663
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5.
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Vertical profiles of sub-3 nm particles over the boreal forest
/ Leino, Katri (Helsinki U.) ; Lampilahti, Janne (Helsinki U.) ; Poutanen, Pyry (Helsinki U.) ; Väänänen, Riikka (Helsinki U.) ; Manninen, Antti (Helsinki U.) ; Buenrostro Mazon, Stephany (Helsinki U.) ; Dada, Lubna (Helsinki U.) ; Franck, Anna (Helsinki U.) ; Wimmer, Daniela (Helsinki U.) ; Aalto, Pasi P (Helsinki U.) et al.
This work presents airborne observations of sub3 nm particles in the lower troposphere and investigates new
particle formation (NPF) within an evolving boundary layer
(BL). We studied particle concentrations together with supporting gas and meteorological data inside the planetary BL
over a boreal forest site in Hyytiälä, southern Finland. [...]
2019 - 12 p.
- Published in : Atmos. Chem. Phys. 19 (2019) 4127-4138
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6.
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Molecular understanding of the suppression of new-particle formation by isoprene
/ Heinritzi, Martin (Frankfurt U.) ; Dada, Lubna (Helsinki U.) ; Simon, Mario (Frankfurt U.) ; Stolzenburg, Dominik (Vienna U.) ; Wagner, Andrea C (Frankfurt U. ; U. Colorado, Boulder) ; Fischer, Lukas (Innsbruck U.) ; Ahonen, Lauri R (Helsinki U.) ; Amanatidis, Stavros (Caltech, Pasadena (main)) ; Baalbaki, Rima (Helsinki U.) ; Baccarini, Andrea (PSI, Villigen) et al.
Nucleation of atmospheric vapours produces more
than half of global cloud condensation nuclei and so has
an important influence on climate. Recent studies show
that monoterpene (C$_{10}$H$_{16}$) oxidation yields highly oxygenated products that can nucleate with or without sulfuric acid. [...]
2020 - 13 p.
- Published in : Atmos. Chem. Phys. 20 (2020) 11809-11821
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7.
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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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8.
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Multicomponent new particle formation from sulfuric acid, ammonia, and biogenic vapors
/ Lehtipalo, Katrianne (U. Helsinki (main) ; PSI, Villigen ; Finnish Meteorological Inst.) ; Yan, Chao (U. Helsinki (main)) ; Dada, Lubna (U. Helsinki (main)) ; Bianchi, Federico (U. Helsinki (main)) ; Xiao, Mao (PSI, Villigen) ; Wagner, Robert (U. Helsinki (main)) ; Stolzenburg, Dominik (Vienna U.) ; Ahonen, Lauri R (U. Helsinki (main)) ; Amorim, Antonio (Lisbon, CENTRA ; Lisbon U.) ; Baccarini, Andrea (PSI, Villigen) et al.
A major fraction of atmospheric aerosol particles, which affect both air quality and climate, form from gaseous precursors in the atmosphere. Highly oxygenated organic molecules (HOMs), formed by oxidation of biogenic volatile organic compounds, are known to participate in particle formation and growth. [...]
2018 - 10 p.
- Published in : Sci. Adv. 4 (2018) eaau5363
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9.
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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
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10.
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The role of ions in new particle formation in the CLOUD chamber
/ Wagner, Robert ; Yan, Chao ; Lehtipalo, Katrianne ; Duplissy, Jonathan ; Nieminen, Tuomo ; Kangasluoma, Juha ; Ahonen, Lauri R ; Dada, Lubna ; Kontkanen, Jenni ; Manninen, Hanna E (CERN) et al.
The formation of secondary particles in the atmosphere accounts for more than half of global cloud condensation nuclei. Experiments at the CERN CLOUD (Cosmics Leaving OUtdoor Droplets) chamber have underlined the importance of ions for new particle formation, but quantifying their effect in the atmosphere remains challenging. [...]
2017 - 17 p.
- Published in : Atmos. Chem. Phys. 17 (2017) 15181-15197
Fulltext: PDF; External link: Fulltext
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