Formation of binary ion clusters from polar vapours: effect of the dipole-charge interaction

Nadykto, Alexey B.; Yu, Fangqun

doi:10.5194/acp-4-385-2004

Cited by 12 publications

(10 citation statements)

References 18 publications

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“…Ion-mediated nucleation (IMN) involves the condensation of vapors on positive or negative ions. The attractive potential between ions and ions and between ions and the dipole moment (induced or not) of the condensable vapor reduces the thermodynamic barrier for nucleation and hence, enhances the condensational growth (Lovejoy et al, 2004;Nadykto and Yu, 2004). Conflicting views about the relative importance of IMN subsist between modelling studies (see for example Laakso et al, 2002;Harrisson and Carslaw, 2003;Yu et al, 2008) which assess that IMN should be an important source of atmospheric particles and field measurements (see for example Eisele et al, 2006;Manninen et al, 2009) who show that the contribution of IMN to new particle formation in planetary boundary layer (PBL) is less than 10% in average.…”

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confidence: 99%

New particle formation and ultrafine charged aerosol climatology at a high altitude site in the Alps (Jungfraujoch, 3580 m a.s.l., Switzerland)

Boulon¹,

Sellegri²,

Venzac³

et al. 2010

Preprint

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Aerosol nucleation is an important source of atmospheric particles which have an effect both on the climatic system and on human health. The new particle formation (NPF) process is an ubiquitous phenomenon, yet poorly understood despite the many studies performed on this topic using various approaches (observation, experimentation in smog chambers and modeling). In this work, we investigate the formation of secondary charged aerosols and its climatology at Jungfraujoch, a high altitude site in Swiss Alps (3580 m a.s.l.). Charged particles and clusters (0.5–1.8 nm) were measured within the EUCAARI program from April 2008 to April 2009 and allowed the detection of nucleation events. We found that the aerosol concentration, which is dominated by cluster size class, shows a strong diurnal pattern and that the aerosol size distribution and concentration are strongly influenced by the presence of clouds either during daytime or nighttime conditions. New particle formation events have been investigated and it appears that new particle formation occurs 17.5% of measured days and that the nucleation frequency is strongly linked to air mass origin and path and negatively influenced by cloud presence. In fact, we show that NPF events depend on the occurrence of high concentration VOCs air masses which allowed clusters growing by condensation of organic vapors rather than nucleation of new clusters. Furthermore, the contribution of ions to nucleation process was studied and we found that ion-mediated nucleation (IMN) contribute to 26% of the total nucleation so that ions play an important role in the new particle formation and growth at Jungfraujoch

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confidence: 99%

New particle formation and ultrafine charged aerosol climatology at a high altitude site in the Alps (Jungfraujoch, 3580 m a.s.l., Switzerland)

Boulon¹,

Sellegri²,

Venzac³

et al. 2010

Preprint

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“…New particle formation events have been observed in various environments (see Kulmala et al, 2004, for a review) from polluted area (Hämeri et al, 1996;Harrison et al, 2000;Woo et al, 2001;Stanier et al, 2004;Dunn et al, 2004) to clean or rural sites (Weber et al, 1997;Mäkelä et al, 1997;O'Dowd et al, 1998;Suni et al, 2008), polar areas (Weber et al, 2003;Asmi et al, 2010) and high altitude sites (Weber et al, 1995;Venzac et al, 2007;Shaw, 2007;Nishita et al, 2008;Rodriguez et al, 2009). It has been recently proposed that nucleation was promoted at high altitude .…”

mentioning

confidence: 99%

“…The attractive potential between ions and ions and between ions and the dipole moment (induced or not) of the condensable vapor reduces the thermodynamic barrier for nucleation and hence, enhances the condensational growth (Lovejoy et al, 2004;Nadykto and Yu, 2004). Conflicting views about the relative importance of IMN subsist between modelling studies (see for example Laakso et al, 2002;Harrisson and Carslaw, 2003;Yu et al, 2008) which assess that IMN should be an important source of atmospheric particles and field measurements (see for example Eisele et al, 2006;Manninen et al, 2009) who show that the contribution of IMN to new particle formation in planetary boundary layer (PBL) is less than 10% in average.…”

mentioning

confidence: 99%

New particle formation and ultrafine charged aerosol climatology at a high altitude site in the Alps (Jungfraujoch, 3580 m a.s.l., Switzerland)

et al. 2010

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Atmospheric Chemistry and PhysicsNew particle formation and ultrafine charged aerosol climatology at a high altitude site in the Alps (Jungfraujoch, 3580 m a.s.l., Switzerland) Abstract. We investigate the formation and growth of charged aerosols clusters at Jungfraujoch, in the Swiss Alps (3580 m a.s.l.), the highest altitude site of the European EU-CAARI project intensive campaign. Charged particles and clusters (0.5 − 1.8 nm) were measured from April 2008 to April 2009 and allowed the detection of nucleation events in this very specific environment (presence of free tropospheric air and clouds). We found that the naturally charged aerosol concentrations, which are dominated by the cluster size class, shows a strong diurnal pattern likely linked to valley breezes transporting surface layer ion precursors, presumably radon. Cosmic rays were found not to be the major ion source at the measurement site. However, at night, when air masses are more representative of free tropospheric conditions, we found that the cluster concentrations are still high. The charged aerosol size distribution and concentration are strongly influenced by the presence of clouds at the station. Clouds should be taken into account when deriving high altitude nucleation statistics. New particle formation occurs on average 17.5% of the measurement period and shows a weak seasonality with a minimum of frequency during winter, but this seasonality is enhanced when the data set is screened forCorrespondence to: J. Boulon (j.boulon@opgc.univ-bpclermont.fr) periods when the atmospheric station is out of clouds. The role of ions in the nucleation process was investigated and we found that the ion-mediated nucleation explains 22.3% of the particle formation. The NPF events frequency is correlated with UV radiation but not with calculated H 2 SO 4 concentrations, suggesting that other compounds such as organic vapors are involved in the nucleation and subsequently growth process. In fact, NPF events frequency also surprisingly increases with the condensational sink (CS), suggesting that at Jungfraujoch, the presence of condensing vapours probably coupled with high CS are driving the occurrence of NPF events. A strong link to the air mass path was also pointed out and events were observed to be frequently occurring in Eastern European air masses, which present the highest condensational sink. In these air masses, pre-existing cluster concentrations are more than three time larger than in other air masses during event days, and no new clusters formation is observed, contrarily to what is happening in other air mass types.

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“…These models allow many features of stratospheric aerosol to be suc cessfully reproduced and can be used to predict indi vidual physical processes. Later, these models have been substantially improved by using a parameteriza tion of nucleation and involvement of ions in this pro cess [3][4][5][6]. The aerosol dynamics models mentioned above were used to simulate PSCs [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Modeling the formation of polar stratospheric clouds with allowance for kinetic and heterogeneous processes

Aloyan

Yermakov

Arutyunyan

2015

Izv. Atmos. Ocean. Phys.

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A new mathematical model of global transport of multicomponent gaseous admixtures and aero sols in the atmosphere and the formation of polar stratospheric clouds (PSC) in both hemispheres has been constructed. Two types of PSCs are considered: type Ia, nitric acid trihydrate (NAT), and type Ib, super cooled ternary solutions of H 2 SO 4 /HNO 3 /H 2 O (STS). New equations are used to describe the variation in gas and condensed phase components on the basis of their thermodynamic properties. The formation of PSCs is coupled with sulfate aerosols generated in the upper troposphere and lower stratosphere, and with chemical and kinetic transformation processes (photochemistry, nucleation, condensation/evaporation, and coagulation). Using this coupled model, numerical experiments were performed to reproduce the spatial and temporal variability of PSCs in winter in both hemispheres. First, the formation of primary sulfate aerosols in the atmosphere is considered and then these aerosols are incorporated to the PSC model. The results of the numerical experiments are analyzed.

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Formation of binary ion clusters from polar vapours: effect of the dipole-charge interaction

Cited by 12 publications

References 18 publications

New particle formation and ultrafine charged aerosol climatology at a high altitude site in the Alps (Jungfraujoch, 3580 m a.s.l., Switzerland)

New particle formation and ultrafine charged aerosol climatology at a high altitude site in the Alps (Jungfraujoch, 3580 m a.s.l., Switzerland)

New particle formation and ultrafine charged aerosol climatology at a high altitude site in the Alps (Jungfraujoch, 3580 m a.s.l., Switzerland)

Modeling the formation of polar stratospheric clouds with allowance for kinetic and heterogeneous processes

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