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Dispersion of a traffic related nanocluster aerosol near a major road

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Dispersion of a traffic related nanocluster aerosol near a major road. / Kangasniemi, Oskari; Kuuluvainen, Heino; Heikkilä, Joni; Pirjola, Liisa; Niemi, Jarkko V.; Timonen, Hilkka; Saarikoski, Sanna; Rönkkö, Topi; Maso, Miikka Dal.

In: Atmosphere, Vol. 10, No. 6, 309, 01.06.2019.

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Kangasniemi, Oskari ; Kuuluvainen, Heino ; Heikkilä, Joni ; Pirjola, Liisa ; Niemi, Jarkko V. ; Timonen, Hilkka ; Saarikoski, Sanna ; Rönkkö, Topi ; Maso, Miikka Dal. / Dispersion of a traffic related nanocluster aerosol near a major road. In: Atmosphere. 2019 ; Vol. 10, No. 6.

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@article{3aee2eadb3684c6ebfcb57582ac2fd9a,
title = "Dispersion of a traffic related nanocluster aerosol near a major road",
abstract = "Traffic is a major source of ultrafine aerosol particles in urban environments. Recent studies show that a significant fraction of traffic-related particles are only few nanometers in diameter. Here, we study the dispersion of this nanocluster aerosol (NCA) in the size range 1.3-4 nm. We measured particle concentrations near a major highway in the Helsinki region of Finland, varying the distance from the highway. Additionally, modelling studies were performed to gain further information on how different transformation processes affect NCA dispersion. The roadside measurements showed that NCA concentrations fell more rapidly than the total particle concentrations, especially during the morning. However, a significant amount of NCA particles remained as the aerosol population evolved. Modelling studies showed that, while dilution is the main process acting on the total particle concentration, deposition also had a significant impact. Condensation and possibly enhanced deposition of NCA were the main plausible processes explaining why dispersion is faster for NCA than for total particle concentration, while the effect of coagulation on all size ranges was small. Based on our results, we conclude that NCA may play a significant role in urban environments, since, rather than being scavenged by larger particles, NCA particles remain in the particle population and grow by condensation.",
keywords = "Aerosol modelling, Dispersion, Nanocluster aerosol",
author = "Oskari Kangasniemi and Heino Kuuluvainen and Joni Heikkil{\"a} and Liisa Pirjola and Niemi, {Jarkko V.} and Hilkka Timonen and Sanna Saarikoski and Topi R{\"o}nkk{\"o} and Maso, {Miikka Dal}",
note = "int=phys,{"}Heikkil{\"a}, Joni{"}",
year = "2019",
month = "6",
day = "1",
doi = "10.3390/atmos10060309",
language = "English",
volume = "10",
journal = "Atmosphere",
issn = "2073-4433",
publisher = "Multidisciplinary Digital Publishing Institute",
number = "6",

}

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TY - JOUR

T1 - Dispersion of a traffic related nanocluster aerosol near a major road

AU - Kangasniemi, Oskari

AU - Kuuluvainen, Heino

AU - Heikkilä, Joni

AU - Pirjola, Liisa

AU - Niemi, Jarkko V.

AU - Timonen, Hilkka

AU - Saarikoski, Sanna

AU - Rönkkö, Topi

AU - Maso, Miikka Dal

N1 - int=phys,"Heikkilä, Joni"

PY - 2019/6/1

Y1 - 2019/6/1

N2 - Traffic is a major source of ultrafine aerosol particles in urban environments. Recent studies show that a significant fraction of traffic-related particles are only few nanometers in diameter. Here, we study the dispersion of this nanocluster aerosol (NCA) in the size range 1.3-4 nm. We measured particle concentrations near a major highway in the Helsinki region of Finland, varying the distance from the highway. Additionally, modelling studies were performed to gain further information on how different transformation processes affect NCA dispersion. The roadside measurements showed that NCA concentrations fell more rapidly than the total particle concentrations, especially during the morning. However, a significant amount of NCA particles remained as the aerosol population evolved. Modelling studies showed that, while dilution is the main process acting on the total particle concentration, deposition also had a significant impact. Condensation and possibly enhanced deposition of NCA were the main plausible processes explaining why dispersion is faster for NCA than for total particle concentration, while the effect of coagulation on all size ranges was small. Based on our results, we conclude that NCA may play a significant role in urban environments, since, rather than being scavenged by larger particles, NCA particles remain in the particle population and grow by condensation.

AB - Traffic is a major source of ultrafine aerosol particles in urban environments. Recent studies show that a significant fraction of traffic-related particles are only few nanometers in diameter. Here, we study the dispersion of this nanocluster aerosol (NCA) in the size range 1.3-4 nm. We measured particle concentrations near a major highway in the Helsinki region of Finland, varying the distance from the highway. Additionally, modelling studies were performed to gain further information on how different transformation processes affect NCA dispersion. The roadside measurements showed that NCA concentrations fell more rapidly than the total particle concentrations, especially during the morning. However, a significant amount of NCA particles remained as the aerosol population evolved. Modelling studies showed that, while dilution is the main process acting on the total particle concentration, deposition also had a significant impact. Condensation and possibly enhanced deposition of NCA were the main plausible processes explaining why dispersion is faster for NCA than for total particle concentration, while the effect of coagulation on all size ranges was small. Based on our results, we conclude that NCA may play a significant role in urban environments, since, rather than being scavenged by larger particles, NCA particles remain in the particle population and grow by condensation.

KW - Aerosol modelling

KW - Dispersion

KW - Nanocluster aerosol

U2 - 10.3390/atmos10060309

DO - 10.3390/atmos10060309

M3 - Article

VL - 10

JO - Atmosphere

JF - Atmosphere

SN - 2073-4433

IS - 6

M1 - 309

ER -