Corona ions from high-voltage power lines: Nature of emission and dispersion

Jayaratne, E.R.; Ling, Xuan; Morawska, Lidia

doi:10.1016/j.elstat.2011.03.014

Cited by 15 publications

(17 citation statements)

References 12 publications

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“…In areas away from ion sources, large ions are found in concentrations of 500-1000 cm -3 . However, in the presence of an ion source, this may increase to several thousand cm -3 , with many particles carrying more than one charge (Jayaratne et al, 2011;Lee et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

Charging State of Aerosols during Particle Formation Events in an Urban Environment and Its Implications for Ion-Induced Nucleation

Jayaratne

Ling

Morawska

2016

Aerosol Air Qual. Res.

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The aim of this study was to investigate the charging state of atmospheric ions during particle formation (PF) events in an urban environment. We measured small ion (charged cluster) and large ion (charged particle) concentrations over a period of 13 months in Brisbane, Australia, using a neutral cluster and air ion spectrometer (NAIS) and obtained 245 complete days of data. PF events were observed on 110 days which count as 45% of the total. On the average, the positive small ion concentration was 40% higher than the negative. The positive large ion concentration was 20% higher than the negative. Generally, small ion concentrations peaked during the night, while large ion concentrations were a maximum during the day. Next, we classified the results into days on which there was a PF event and when there was not. We showed that PF events have a profound effect on small and large ion concentrations in the environment; the small ion concentrations decreased by about 30% while large ion concentrations increased by up to 100%. We identified two phenomena that have a bearing on ion-induced nucleation. Firstly, the fraction of particles that were charged consistently decreased during PF events and rarely exceeded the equilibrium value, suggesting that the formation process was not significantly influenced by an ion-induced mechanism. Secondly, small ion concentrations were higher in the pre-dawn hours of PF event days than on other days, while the fraction of clusters that were charged often showed an increase immediately prior to a PF event, both observations supporting an ion-induced mechanism of PF. This study serves as basis for future work explaining these observations.

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Section: Introductionmentioning

confidence: 99%

Charging State of Aerosols during Particle Formation Events in an Urban Environment and Its Implications for Ion-Induced Nucleation

Jayaratne

Ling

Morawska

2016

Aerosol Air Qual. Res.

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“…In a recent study, we showed that ion emission does not occur uniformly along OHVPLs but only from discrete corona points on the lines, generally on insulators and spacers (Jayaratne et al, 2011). Long stretches of the lines are often corona-free and the charged particle concentrations in these vicinities are not higher than the background values.…”

Section: Site Description and Measurement Techniquesmentioning

confidence: 97%

“…Total net space charge concentrations have also been estimated using direct current (DC) electric field measurements (Fews et al, 1999(Fews et al, , 2002Matthews et al, 2010Matthews et al, , 2012. Studies using the aerosol electrometer have provided net charged particle concentrations (Jayaratne et al, 2011;J-Fatokun et al, 2010;Ling et al, 2010). However, there have not been any direct measurements of total charged particle concentrations under OHVPLs.…”

Section: Introductionmentioning

confidence: 99%

“…Monitoring studies under alternating current (AC) OHVPLs have reported air ion concentration (Jayaratne et al, , 2011Ling et al, 2010) or total space charge concentration (Bracken et al, 2005;Grabarczyk and Berlinski, 2004). While air ions do not include charged particles, space charge includes both air ions and charged particles.…”

Section: Introductionmentioning

confidence: 99%

“…In stable air, this results in a uniform background air ion concentration of between 200 and 2500 cm −3 , the concentrations being mainly determined by the level of particle pollution in the environment (Hirsikko et al, 2011;Retalis et al, 2009). Anthropogenic sources of ions, such as corona discharge in overhead high-voltage power lines (OHVPL), may significantly affect concentrations of ions and charged particles in the urban environment Fews et al, 1999Fews et al, , 2002Jayaratne et al, 2008Jayaratne et al, , 2011. We have monitored air ion concentrations at 41 OHVPL sites in Australia, and shown that the concentration at 76% of these sites exceeded the mean background value .…”

Section: Introductionmentioning

confidence: 99%

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