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Methods for determining particle size distribution and growth rates between 1 and 3 nm using the Particle Size Magnifier
/ Lehtipalo, Katrianne (Helsinki U. ; Airmodus, Helsinki) ; Leppä, Johannes (Finnish Meteorological Inst.) ; Kontkanen, Jenni (Helsinki U.) ; Kangasluoma, Juha (Helsinki U.) ; Franchin, Alessandro (Helsinki U.) ; Wimmer, Daniela (Helsinki U.) ; Schobesberger, Siegfried (Helsinki U.) ; Junninen, Heikki (Helsinki U.) ; Petäjä, Tuukka (Helsinki U.) ; Sipilä, Mikko (Helsinki U.) et al.
The most important parameters describing the atmospheric new particle formation process are the particle formation and growth rates. These together determine the amount of cloud condensation nuclei attributed to secondary particle formation. [...]
2014
- Published in : Boreal Env. Res.: 19 (suppl. B) (2014) , pp. 215-236
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2.
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Performance of diethylene glycol-based particle counters in the sub-3 nm size range
/ Wimmer, D (Goethe U., Frankfurt (main)) ; Lehtipalo, K (Helsinki U. ; Airmodus, Helsinki) ; Franchin, A (Helsinki U.) ; Kangasluoma, J (Helsinki U.) ; Kreissl, F (Goethe U., Frankfurt (main)) ; Kürten, A (Goethe U., Frankfurt (main)) ; Kupc, A (U. Vienna (main)) ; Metzger, A (Goethe U., Frankfurt (main)) ; Mikkilä, J (Airmodus, Helsinki) ; Petäjä, J (Helsinki U.) et al.
When studying new particle formation, the uncertainty in determining the "true" nucleation rate is considerably reduced when using condensation particle counters (CPCs) capable of measuring concentrations of aerosol particles at sizes close to or even at the critical cluster size (1–2 nm). Recently, CPCs able to reliably detect particles below 2 nm in size and even close to 1 nm became available. [...]
2013
- Published in : Atmos. Meas. Tech. 6 (2013) 1793-1804
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3.
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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
Fulltext: PDF;
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4.
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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
Fulltext: PDF; External link: Fulltext
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5.
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Technical Note: Using DEG-CPCs at upper tropospheric temperatures
/ Wimmer, D (Goethe U., Frankfurt (main) ; Helsinki U.) ; Lehtipalo, K (Helsinki U. ; Airmodus Ltd, Helsinki) ; Nieminen, T (Helsinki U.) ; Duplissy, J (Helsinki U.) ; Ehrhart, S (Goethe U., Frankfurt (main) ; CERN) ; Almeida, J (Goethe U., Frankfurt (main) ; CERN) ; Rondo, L (Goethe U., Frankfurt (main)) ; Franchin, A (Helsinki U.) ; Kreissl, F (Goethe U., Frankfurt (main)) ; Bianchi, F (PSI, Villigen ; Zurich, ETH) et al.
Over the last few years, several condensation particle counters (CPCs) capable of measuring in the sub-3 nm size range have been developed. Here we study the performance of CPCs based on diethylene glycol (DEG) at different temperatures during Cosmics Leaving OUtdoor Droplets (CLOUD) measurements at CERN. [...]
2015 - 9 p.
- Published in : Atmos. Chem. Phys. 15 (2015) 7547-7555
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6.
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Neutral molecular cluster formation of sulfuric acid–dimethylamine observed in real time under atmospheric conditions
/ Kürten, Andreas (Goethe U., Frankfurt (main)) ; Jokinen, Tuija (Helsinki U.) ; Simon, Mario (Goethe U., Frankfurt (main)) ; Sipilä, Mikko (Helsinki U. ; Helsinki Inst. of Phys.) ; Sarnela, Nina (Helsinki U.) ; Junninen, Heikki (Helsinki U.) ; Adamov, Alexey (Helsinki U.) ; Almeida, João (Goethe U., Frankfurt (main) ; CERN) ; Amorim, Antonio (UBI, Covilha ; U. Lisbon (main)) ; Bianchi, Federico (PSI, Villigen) et al.
For atmospheric sulfuric acid (SA) concentrations the presence of dimethylamine (DMA) at mixing ratios of several parts per trillion by volume can explain observed boundary layer new particle formation rates. However, the concentration and molecular composition of the neutral (uncharged) clusters have not been reported so far due to the lack of suitable instrumentation. [...]
arXiv:1509.03474.-
2014
- Published in : Proc. Natl. Acad. Sci. U.S.A. 111 (2014) 15019-15024
External link: Fulltext
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7.
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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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8.
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The effect of acid–base clustering and ions on the growth of atmospheric nano-particles
/ Lehtipalo, Katrianne (Helsinki U. ; PSI, Villigen) ; Rondo, Linda (Frankfurt U.) ; Kontkanen, Jenni (Helsinki U.) ; Schobesberger, Siegfried (Helsinki U. ; Washington U., Seattle) ; Jokinen, Tuija (Helsinki U.) ; Sarnela, Nina (Helsinki U.) ; Kürten, Andreas (Frankfurt U.) ; Ehrhart, Sebastian (Frankfurt U. ; CERN) ; Franchin, Alessandro (Helsinki U.) ; Nieminen, Tuomo (Helsinki U.) et al.
The growth of freshly formed aerosol particles can be the bottleneck in their survival to cloud condensation nuclei. It is therefore crucial to understand how particles grow in the atmosphere. [...]
2016
- Published in : Nature Commun. 7 (2016) 11594
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9.
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Role of sulphuric acid, ammonia and galactic cosmic rays in atmospheric aerosol nucleation
/ Kirkby, Jasper (CERN) ; Curtius, Joachim (Goethe U., Frankfurt) ; Almeida, João (Goethe U., Frankfurt ; SIM, Lisbon U. ; Beira Interior U., Lisbon) ; Dunne, Eimear (Leeds U.) ; Duplissy, Jonathan (CERN ; Helsinki U. ; Helsinki Inst. of Phys.) ; Ehrhart, Sebastian (Goethe U., Frankfurt) ; Franchin, Alessandro (Helsinki U.) ; Gagné, Stéphanie (Helsinki U. ; Helsinki Inst. of Phys.) ; Ickes, Luisa (Goethe U., Frankfurt) ; Kürten, Andreas (Goethe U., Frankfurt) et al.
Atmospheric aerosols exert an important influence on climate1 through their effects on stratiform cloud albedo and lifetime2 and the invigoration of convective storms3. Model calculations suggest that almost half of the global cloud condensation nuclei in the atmospheric boundary layer may originate from the nucleation of aerosols from trace condensable vapours4, although the sensitivity of the number of cloud condensation nuclei to changes of nucleation rate may be small5, 6. [...]
2011
- Published in : Nature 476 (2011) 429-433
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10.
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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
Fulltext: PDF; External link: Fulltext
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