Characterisation of corona-generated ions used in a Neutral cluster  and Air Ion Spectrometer (NAIS)

Manninen, Hanna E.; Franchin, Alessandro; Schobesberger, Siegfried; Hirsikko, Anne; Hakala, J.; Skromulis, Andris; Kangasluoma, Juha; Ehn, Mikael; Junninen, Heikki; Mirme, A.; Mirme, Sander; Sipilä, Mikko; Petäj̈ä, Tuukka; Worsnop, Douglas R.; Kulmala, Markku

doi:10.5194/amt-4-2767-2011

Cited by 50 publications

(27 citation statements)

References 29 publications

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“…Only particles larger than the charger ions can reliably be measured. The lower size limit of NAIS in particle mode is thus ∼ 2 nm Manninen et al, 2011).…”

Section: Chargingmentioning

confidence: 99%

The mathematical principles and design of the NAIS – a spectrometer for the measurement of cluster ion and nanometer aerosol size distributions

2013

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Abstract. The paper describes the Neutral cluster and Air Ion Spectrometer (NAIS) – a multichannel aerosol instrument capable of measuring the distribution of ions (charged particles and cluster ions) of both polarities in the electric mobility range from 3.2 to 0.0013 cm2 V−1 s−1 and the distribution of aerosol particles in the size range from 2.0 to 40 nm. We introduce the principles of design, data processing and spectrum deconvolution of the instrument.

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“…Only particles larger than the charger ions can reliably be measured. The lower size limit of NAIS in particle mode is thus ∼ 2 nm Manninen et al, 2011).…”

Section: Chargingmentioning

confidence: 99%

The mathematical principles and design of the NAIS – a spectrometer for the measurement of cluster ion and nanometer aerosol size distributions

2013

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“…In the present study, we collected data of charged and uncharged particle concentrations in the urban environment of Brisbane using a neutral cluster and air ion spectrometer (NAIS) on close to five hundred days. The NAIS can provide more accurate information on NPF than the SMPS, because of its ability to measure particles down to 2 nm in size, which is very close to the size at which the initial steps of nucleation and formation of particles occur (Manninen et al, 2011(Manninen et al, , 2016. The results were compared with that obtained simultaneously with an SMPS with a minimum detectable size of 9 nm.…”

Section: Occurrence Ratementioning

confidence: 99%

Differentiating between particle formation and growth events in an urban environment

2018

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Abstract. Small aerosols at a given location in the atmosphere often originate in situ from new particle formation (NPF). However, they can also be produced and then transported from a distant location to the point of observation where they may continue to grow to larger sizes. This study was carried out in the subtropical urban environment of Brisbane, Australia, in order to assess the relative occurrence frequencies of NPF events and particle growth events with no NPF. We used a neutral cluster and air ion spectrometer (NAIS) to monitor particles and ions in the size range 2–42 nm on 485 days, and identified 236 NPF events on 213 days. The majority of these events (37 %) occurred during the daylight hours with just 10 % at night. However, the NAIS also showed particle growth with no NPF on many nights (28 %). Using a scanning mobility particle sizer (SMPS), we showed that particle growth continued at larger sizes and occurred on 70 % of nights, typically under high relative humidities. Most particles in the air, especially near coastal locations, contain hygroscopic salts such as sodium chloride that may exhibit deliquescence when the relative humidity exceeds about 75 %. The growth rates of particles at night often exceeded the rates observed during NPF events. Although most of these night time growth events were preceded by day time NPF events, the latter was not a prerequisite for growth. We conclude that particle growth in the atmosphere can be easily misidentified as NPF, especially when they are monitored by an instrument that cannot detect them at the very small sizes.

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“…The Mediterranean atmosphere is affected adversely by particulate and gaseous pollution. Consequently, aerosol and/or ozone mixing ratios are usually more elevated in the Mediterranean region than in the majority of the continental European regions, chiefly during summer (Doche et al, 2014;Menut et al, 2015;Nabat et al, 2013;Safieddine et al, 2014). The Mediterranean is also regarded as a notorious climate change "hot spot" and which is predicted to undergo significant warming and drying in the 21st century (Giorgi, 2006;Kopf, 2010;Lelieveld et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

Driving parameters of biogenic volatile organic compounds and consequences on new particle formation observed at an eastern Mediterranean background site

et al. 2018

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H 2 SO 4 concentrations coupled with high BVOC concentrations seemed to be one of the most favorable conditions Published by Copernicus Publications on behalf of the European Geosciences Union. 14298 C. Debevec et al.: Biogenic VOCs at an eastern Mediterranean background siteto observe NPF at CAO in March 2015. NPF event days were characterized by either (1) a predominant anthropogenic influence (high concentrations of anthropogenic source tracers observed), (2) a predominant biogenic influence (high BVOC concentrations coupled with low anthropogenic tracer concentrations), (3) a mixed influence (high BVOC concentrations coupled with high anthropogenic tracer concentrations) and (4) a marine influence (both low BVOC and anthropogenic tracer concentrations). More pronounced NPF events were identified during mixed anthropogenic-biogenic conditions compared to the pure anthropogenic or biogenic ones, for the same levels of precursors. Analysis of a specific NPF period of the mixed influence type highlighted that BVOC interactions with anthropogenic compounds enhanced nucleation formation and growth of newly formed particles. During this period, the nucleation-mode particles may be formed by the combination of high H 2 SO 4 and isoprene amounts, under favorable meteorological conditions (high temperature and solar radiation and low relative humidity) along with low CS. During the daytime, growth of the newly formed particles, not only sulfate but also oxygenlike organic aerosol (OOA) mass contributions, increased in the particle phase. High BVOC concentrations were observed during the night following NPF events, accompanied by an increase in CS and in semi-volatile OOA contributions, suggesting further BVOC contribution to aerosol nighttime growth by condensing onto pre-existing aerosols.

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Characterisation of corona-generated ions used in a Neutral cluster and Air Ion Spectrometer (NAIS)

Cited by 50 publications

References 29 publications

The mathematical principles and design of the NAIS – a spectrometer for the measurement of cluster ion and nanometer aerosol size distributions

The mathematical principles and design of the NAIS – a spectrometer for the measurement of cluster ion and nanometer aerosol size distributions

Differentiating between particle formation and growth events in an urban environment

Driving parameters of biogenic volatile organic compounds and consequences on new particle formation observed at an eastern Mediterranean background site

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