Diurnal variation of nanocluster aerosol concentrations and emission factors in a street canyon

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Diurnal variation of nanocluster aerosol concentrations and emission factors in a street canyon. / Hietikko, Riina; Kuuluvainen, Heino; Harrison, Roy; Portin, Harri; Timonen, Hikka; Niemi, Jarkko V.; Ronkko, Topi.

In: Atmospheric Environment, Vol. 189, 01.09.2018, p. 98-106.

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Hietikko, Riina ; Kuuluvainen, Heino ; Harrison, Roy ; Portin, Harri ; Timonen, Hikka ; Niemi, Jarkko V. ; Ronkko, Topi. / Diurnal variation of nanocluster aerosol concentrations and emission factors in a street canyon. In: Atmospheric Environment. 2018 ; Vol. 189. pp. 98-106.

Bibtex

@article{9d5b1668fba6411f97dccdcc5eaa4661,
title = "Diurnal variation of nanocluster aerosol concentrations and emission factors in a street canyon",
abstract = "Traffc emits a considerable amount of aerosol particles in urban areas andhas also recently been shown to be a signi_cant source of sub-3 nm particles.In this study, the concentration of sub-3 nm particles, here referred to asnanocluster aerosol (NCA), was continuously measured with one second resolution in a busy street canyon in the city of Helsinki, Finland, for a monthperiod in 2017. NCA concentrations were carefully analyzed with respect tothe time of day, the wind direction, the condensation sink, the concentrationof sub-7 nm particles, the total particle size distribution, and the CO2concentration, from which the emission factors for the NCA were calculated.The concentration of the NCA seemed to follow a similar trend to that ofsub-7 nm particles. Diurnal variation of the NCA concentration divided intoweekdays and weekends and sorted according to the wind direction followedthe amount traffc. The NCA concentration was at highest when wind wasblowing directly from the road, during the rush hours or when the condensationsink calculated from the particle size distributions was low. The NCA concentration was in line with the tra_c-related nucleation mode of the sizedistribution and its diurnal variation, and the NCA fraction comprised arelatively large part of the total particle number concentration. Averageemission factors for the NCA and sub-7 nm particles were 9.36 ˑ1014 kg-1fueland 2.73 ˑ1015 kg-1fuel respectively. Diurnal variation of the emission factorsshowed an increase in the night, which may result from a dependency of theemission factors on traffc composition, temperature, condensation sink orthe driving mode of vehicles.",
keywords = "nanocluster aerosol, street canyon, urban air, traffic emissions",
author = "Riina Hietikko and Heino Kuuluvainen and Roy Harrison and Harri Portin and Hikka Timonen and Niemi, {Jarkko V.} and Topi Ronkko",
year = "2018",
month = "9",
day = "1",
doi = "10.1016/j.atmosenv.2018.06.031",
language = "English",
volume = "189",
pages = "98--106",
journal = "Atmospheric Environment",
issn = "1352-2310",
publisher = "Elsevier",

}

RIS

TY - JOUR

T1 - Diurnal variation of nanocluster aerosol concentrations and emission factors in a street canyon

AU - Hietikko, Riina

AU - Kuuluvainen, Heino

AU - Harrison, Roy

AU - Portin, Harri

AU - Timonen, Hikka

AU - Niemi, Jarkko V.

AU - Ronkko, Topi

PY - 2018/9/1

Y1 - 2018/9/1

N2 - Traffc emits a considerable amount of aerosol particles in urban areas andhas also recently been shown to be a signi_cant source of sub-3 nm particles.In this study, the concentration of sub-3 nm particles, here referred to asnanocluster aerosol (NCA), was continuously measured with one second resolution in a busy street canyon in the city of Helsinki, Finland, for a monthperiod in 2017. NCA concentrations were carefully analyzed with respect tothe time of day, the wind direction, the condensation sink, the concentrationof sub-7 nm particles, the total particle size distribution, and the CO2concentration, from which the emission factors for the NCA were calculated.The concentration of the NCA seemed to follow a similar trend to that ofsub-7 nm particles. Diurnal variation of the NCA concentration divided intoweekdays and weekends and sorted according to the wind direction followedthe amount traffc. The NCA concentration was at highest when wind wasblowing directly from the road, during the rush hours or when the condensationsink calculated from the particle size distributions was low. The NCA concentration was in line with the tra_c-related nucleation mode of the sizedistribution and its diurnal variation, and the NCA fraction comprised arelatively large part of the total particle number concentration. Averageemission factors for the NCA and sub-7 nm particles were 9.36 ˑ1014 kg-1fueland 2.73 ˑ1015 kg-1fuel respectively. Diurnal variation of the emission factorsshowed an increase in the night, which may result from a dependency of theemission factors on traffc composition, temperature, condensation sink orthe driving mode of vehicles.

AB - Traffc emits a considerable amount of aerosol particles in urban areas andhas also recently been shown to be a signi_cant source of sub-3 nm particles.In this study, the concentration of sub-3 nm particles, here referred to asnanocluster aerosol (NCA), was continuously measured with one second resolution in a busy street canyon in the city of Helsinki, Finland, for a monthperiod in 2017. NCA concentrations were carefully analyzed with respect tothe time of day, the wind direction, the condensation sink, the concentrationof sub-7 nm particles, the total particle size distribution, and the CO2concentration, from which the emission factors for the NCA were calculated.The concentration of the NCA seemed to follow a similar trend to that ofsub-7 nm particles. Diurnal variation of the NCA concentration divided intoweekdays and weekends and sorted according to the wind direction followedthe amount traffc. The NCA concentration was at highest when wind wasblowing directly from the road, during the rush hours or when the condensationsink calculated from the particle size distributions was low. The NCA concentration was in line with the tra_c-related nucleation mode of the sizedistribution and its diurnal variation, and the NCA fraction comprised arelatively large part of the total particle number concentration. Averageemission factors for the NCA and sub-7 nm particles were 9.36 ˑ1014 kg-1fueland 2.73 ˑ1015 kg-1fuel respectively. Diurnal variation of the emission factorsshowed an increase in the night, which may result from a dependency of theemission factors on traffc composition, temperature, condensation sink orthe driving mode of vehicles.

KW - nanocluster aerosol

KW - street canyon

KW - urban air

KW - traffic emissions

U2 - 10.1016/j.atmosenv.2018.06.031

DO - 10.1016/j.atmosenv.2018.06.031

M3 - Article

VL - 189

SP - 98

EP - 106

JO - Atmospheric Environment

JF - Atmospheric Environment

SN - 1352-2310

ER -