Influence of medium range transport of particles from nucleation burst on particle number concentration within the urban airshed

Cheung, Hing Cho; Morawska, Lidia; Ristovski, Zoran; Wainwright, David

doi:10.5194/acp-12-4951-2012

Cited by 17 publications

(13 citation statements)

References 22 publications

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“…For cluster and intermediate ions, relatively weak directional dependency was observed compared to that for large ions. In previous studies, anthropogenic pollution (including local vehicle and industrial emissions) was found to be dominant when southwesterly and northeasterly winds prevailed (Cheung et al, 2011(Cheung et al, , 2012. The results of this study further suggested that higher large ion concentrations were also associated with the southwest/ northeast directions, whereas the relatively uniform concentrations for cluster and intermediate ions were attributed to neutral ion production, such as the ionization of air molecules by cosmic rays.…”

Section: Overall Resultssupporting

confidence: 33%

Impact of particle formation on atmospheric ions and particle number concentrations in an urban environment

Cheung

Chou

Jayaratne

et al. 2015

Atmospheric Research

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A measurement campaign was conducted from 3 to 19 December 2012 at an urban site of Brisbane, Australia. Size distribution of ions and particle number concentrations were measured to investigate the influence of particle formation and biomass burning on atmospheric ion and particle concentrations. Overall ion and particle number concentrations during the measurement period were found to be (−1.2 × 10 3 cm −3 | +1.6 × 10 3 cm −3 ) and 4.4 × 10 3 , respectively. The results of correlation analysis between concentrations of ions and nitrogen oxides indicated that positive and negative ions originated from similar sources, and that vehicle exhaust emissions had a more significant influence on intermediate/large ions, while cluster ions rapidly attached to larger particles once emitted into the atmosphere. Diurnal variations in ion concentration suggested the enrichment of intermediate and large ions on new particle formation event days, indicating that they were involved in the particle formation processes. Elevated total ions, particularly larger ions, and particle number concentrations were found during biomass burning episodes. This could be due to the attachment of cluster ions onto accumulation mode particles or production of charged particles from biomass burning, which were in turn transported to the measurement site. The results of this work enhance scientific understanding of the sources of atmospheric ions in an urban environment, as well as their interactions with particles during particle formation processes.

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Section: Overall Resultssupporting

confidence: 33%

Impact of particle formation on atmospheric ions and particle number concentrations in an urban environment

Cheung

Chou

Jayaratne

et al. 2015

Atmospheric Research

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“…An origin from the industrial zone is plausible. As already reported, a large coal-fired power plant and an oil refinery are located in the industrial area of Porto Marghera and both installations are potential sources of particles in the nucleation range (Nielsen et al, 2002;Liu et al, 2010;Cheung et al, 2012) and SO 2 . Emission inventories for 2010 (ARPAV e Regione Veneto, 2015) reported that combustion in energy and transformation industries accounts for~72% of total SO 2 emissions in the Venice Province.…”

Section: Pmf Resultsmentioning

confidence: 68%

“…It has been reported that the probability of nucleation is increased by elevated SO 2 concentrations (e.g., Stanier et al, 2004) and a 13 year-long monitoring of airborne pollutants conducted in Mestre (Masiol et al, 2014b) reported evident peaks of SO 2 for winds blowing from the industrial zone. A large influence of oil refineries and/or coal-fired power plants upon the particle number concentrations in the nucleation range have been observed in many parts of the world (e.g., Stevens et al, 2012;Cheung et al, 2012;Gonz alez and Rodríguez, 2013).…”

Section: Pmf Resultsmentioning

confidence: 99%

Source apportionment of wide range particle size spectra and black carbon collected at the airport of Venice (Italy)

Masiol

Beddows

et al. 2016

Atmospheric Environment

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h i g h l i g h t sParticle number, size and black carbon were measured at the airport of Venice. Data were analysed along with gases, weather parameters and flight traffic. Six potential sources were identified and apportioned by PMF analysis on PNSD. Airport emissions contributed~20% to the total PNC. No specific local sources of BC can be identified as dominant. a b s t r a c t Atmospheric particles are of high concern due to their toxic properties and effects on climate, and large airports are known as significant sources of particles. This study investigates the contribution of the Airport of Venice (Italy) to black carbon (BC), total particle number concentrations (PNC) and particle number size distributions (PNSD) over a large range (14 nme20 mm). Continuous measurements were conducted between April and June 2014 at a site located 110 m from the main taxiway and 300 m from the runway. Results revealed no significantly elevated levels of BC and PNC, but exhibited characteristic diurnal profiles. PNSD were then analysed using both k-means cluster analysis and positive matrix factorization. Five clusters were extracted and identified as midday nucleation events, road traffic, aircraft, airport and nighttime pollution. Six factors were apportioned and identified as probable sources according to the size profiles, directional association, diurnal variation, road and airport traffic volumes and their relationships to micrometeorology and common air pollutants. Photochemical nucleation accounted for~44% of total number, followed by road þ shipping traffic (26%). Airport-related emissions accounted for~20% of total PNC and showed a main mode at 80 nm and a second mode beyond the lower limit of the SMPS (<14 nm). The remaining factors accounted for less than 10% of number counts, but were relevant for total volume concentrations: nighttime nitrate, regional pollution and local resuspension. An analysis of BC levels over different wind sectors revealed no especially significant contributions from specific directions associated with the main local sources, but a potentially significant role of diurnal dynamics of the mixing layer on BC levels. The approaches adopted in this study have identified and apportioned the main sources of particles and BC at an international airport located in area affected by a complex emission scenario. The results may underpin measures for improving local and regional air quality, and health impact assessment studies.

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“…Anderson et al, 2005;Herndon et al, 2008;Kinsey et al, 2010;Mazaheri et al, 2009Mazaheri et al, , 2013Masiol and Harrison, 2014;Lobo et al, 2015Lobo et al, , 2012 as well as from other anthropogenic (e.g. Schneider et al, 2005;Chen et al, 2011;Cheung et al, 2012;Stevens et al, 2012;Kumar et al, 2013Kumar et al, , 2014Vu et al, 2015b) and natural (e.g. Kulmala et al, 1998;O'Dowd et al, 1998O'Dowd et al, , 1999Kulmala and Kerminen, 2008;Riccobono et al, 2014) sources.…”

Section: Warm Seasonmentioning

confidence: 99%

Sources of sub-micrometre particles near a major international airport

Masiol

Harrison

et al. 2017

Atmos. Chem. Phys.

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Abstract. The international airport of Heathrow is a major source of nitrogen oxides, but its contribution to the levels of sub-micrometre particles is unknown and is the objective of this study. Two sampling campaigns were carried out during warm and cold seasons at a site close to the airfield (1.2 km). Size spectra were largely dominated by ultrafine particles: nucleation particles (< 30 nm) were found to be ∼ 10 times higher than those commonly measured in urban background environments of London. Five clusters and six factors were identified by applying k means cluster analysis and positive matrix factorisation (PMF), respectively, to particle number size distributions; their interpretation was based on their modal structures, wind directionality, diurnal patterns, road and airport traffic volumes, and on the relationship with weather and other air pollutants. Airport emissions, fresh and aged road traffic, urban accumulation mode, and two secondary sources were then identified and apportioned. The fingerprint of Heathrow has a characteristic modal structure peaking at < 20 nm and accounts for 30-35 % of total particles in both the seasons. Other main contributors are fresh (24-36 %) and aged (16-21 %) road traffic emissions and urban accumulation from London (around 10 %). Secondary sources accounted for less than 6 % in number concentrations but for more than 50 % in volume concentration. The analysis of a strong regional nucleation event showed that both the cluster categorisation and PMF contributions were affected during the first 6 h of the event. In 2016, the UK government provisionally approved the construction of a third runway; therefore the direct and indirect impact of Heathrow on local air quality is expected to increase unless mitigation strategies are applied successfully.

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Influence of medium range transport of particles from nucleation burst on particle number concentration within the urban airshed

Cited by 17 publications

References 22 publications

Impact of particle formation on atmospheric ions and particle number concentrations in an urban environment

Impact of particle formation on atmospheric ions and particle number concentrations in an urban environment

Source apportionment of wide range particle size spectra and black carbon collected at the airport of Venice (Italy)

Sources of sub-micrometre particles near a major international airport

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