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

Tutkimustuotosvertaisarvioitu

Standard

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

julkaisussa: Atmospheric Environment, Vuosikerta 189, 01.09.2018, s. 98-106.

Tutkimustuotosvertaisarvioitu

Harvard

Hietikko, R, Kuuluvainen, H, Harrison, RM, Portin, H, Timonen, H, Niemi, JV & Rönkkö, T 2018, 'Diurnal variation of nanocluster aerosol concentrations and emission factors in a street canyon', Atmospheric Environment, Vuosikerta. 189, Sivut 98-106. https://doi.org/10.1016/j.atmosenv.2018.06.031

APA

Hietikko, R., Kuuluvainen, H., Harrison, R. M., Portin, H., Timonen, H., Niemi, J. V., & Rönkkö, T. (2018). Diurnal variation of nanocluster aerosol concentrations and emission factors in a street canyon. Atmospheric Environment, 189, 98-106. https://doi.org/10.1016/j.atmosenv.2018.06.031

Vancouver

Hietikko R, Kuuluvainen H, Harrison RM, Portin H, Timonen H, Niemi JV et al. Diurnal variation of nanocluster aerosol concentrations and emission factors in a street canyon. Atmospheric Environment. 2018 syys 1;189:98-106. https://doi.org/10.1016/j.atmosenv.2018.06.031

Author

Hietikko, Riina ; Kuuluvainen, Heino ; Harrison, Roy M. ; Portin, Harri ; Timonen, Hilkka ; Niemi, Jarkko V. ; Rönkkö, Topi. / Diurnal variation of nanocluster aerosol concentrations and emission factors in a street canyon. Julkaisussa: Atmospheric Environment. 2018 ; Vuosikerta 189. Sivut 98-106.

Bibtex - Lataa

@article{53720c4372e14790af5ffb0f14fdb2ca,
title = "Diurnal variation of nanocluster aerosol concentrations and emission factors in a street canyon",
abstract = "Traffic emits a considerable amount of aerosol particles in urban areas and has also recently been shown to be a significant source of sub-3 nm particles. In this study, the concentration of sub-3 nm particles, here referred to as nanocluster aerosol (NCA), was continuously measured with 1 s resolution in a busy street canyon in the city of Helsinki, Finland, for a month period in 2017. NCA concentrations were carefully analyzed with respect to the time of day, the wind direction, the condensation sink, the concentration of sub-7 nm particles, the total particle size distribution, and the CO2 concentration, from which the emission factors for the NCA were calculated. The concentration of the NCA seemed to follow a similar trend to that of sub-7 nm particles. Diurnal variation of the NCA concentration divided into weekdays and weekends and sorted according to the wind direction followed the amount traffic. The NCA concentration was at highest when wind was blowing directly from the road, during the rush hours or when the condensation sink calculated from the particle size distributions was low. The NCA concentration was in line with the traffic-related nucleation mode of the size distribution and its diurnal variation, and the NCA fraction comprised a relatively large part of the total particle number concentration. Average emission factors for the NCA and sub-7 nm particles were 9.36 ⋅ 1014 kgfuel −1 and 2.73 ⋅ 1015 kgfuel −1, respectively. Diurnal variation of the emission factors showed an increase in the night, which may result from a dependency of the emission factors on traffic composition, temperature, condensation sink or the driving mode of vehicles.",
keywords = "Nanocluster aerosol, Street canyon, Traffic emissions, Urban air",
author = "Riina Hietikko and Heino Kuuluvainen and Harrison, {Roy M.} and Harri Portin and Hilkka Timonen and Niemi, {Jarkko V.} and Topi R{\"o}nkk{\"o}",
note = "INT=fys,{"}Hietikko, Riina{"}",
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 (suitable for import to EndNote) - Lataa

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 M.

AU - Portin, Harri

AU - Timonen, Hilkka

AU - Niemi, Jarkko V.

AU - Rönkkö, Topi

N1 - INT=fys,"Hietikko, Riina"

PY - 2018/9/1

Y1 - 2018/9/1

N2 - Traffic emits a considerable amount of aerosol particles in urban areas and has also recently been shown to be a significant source of sub-3 nm particles. In this study, the concentration of sub-3 nm particles, here referred to as nanocluster aerosol (NCA), was continuously measured with 1 s resolution in a busy street canyon in the city of Helsinki, Finland, for a month period in 2017. NCA concentrations were carefully analyzed with respect to the time of day, the wind direction, the condensation sink, the concentration of sub-7 nm particles, the total particle size distribution, and the CO2 concentration, from which the emission factors for the NCA were calculated. The concentration of the NCA seemed to follow a similar trend to that of sub-7 nm particles. Diurnal variation of the NCA concentration divided into weekdays and weekends and sorted according to the wind direction followed the amount traffic. The NCA concentration was at highest when wind was blowing directly from the road, during the rush hours or when the condensation sink calculated from the particle size distributions was low. The NCA concentration was in line with the traffic-related nucleation mode of the size distribution and its diurnal variation, and the NCA fraction comprised a relatively large part of the total particle number concentration. Average emission factors for the NCA and sub-7 nm particles were 9.36 ⋅ 1014 kgfuel −1 and 2.73 ⋅ 1015 kgfuel −1, respectively. Diurnal variation of the emission factors showed an increase in the night, which may result from a dependency of the emission factors on traffic composition, temperature, condensation sink or the driving mode of vehicles.

AB - Traffic emits a considerable amount of aerosol particles in urban areas and has also recently been shown to be a significant source of sub-3 nm particles. In this study, the concentration of sub-3 nm particles, here referred to as nanocluster aerosol (NCA), was continuously measured with 1 s resolution in a busy street canyon in the city of Helsinki, Finland, for a month period in 2017. NCA concentrations were carefully analyzed with respect to the time of day, the wind direction, the condensation sink, the concentration of sub-7 nm particles, the total particle size distribution, and the CO2 concentration, from which the emission factors for the NCA were calculated. The concentration of the NCA seemed to follow a similar trend to that of sub-7 nm particles. Diurnal variation of the NCA concentration divided into weekdays and weekends and sorted according to the wind direction followed the amount traffic. The NCA concentration was at highest when wind was blowing directly from the road, during the rush hours or when the condensation sink calculated from the particle size distributions was low. The NCA concentration was in line with the traffic-related nucleation mode of the size distribution and its diurnal variation, and the NCA fraction comprised a relatively large part of the total particle number concentration. Average emission factors for the NCA and sub-7 nm particles were 9.36 ⋅ 1014 kgfuel −1 and 2.73 ⋅ 1015 kgfuel −1, respectively. Diurnal variation of the emission factors showed an increase in the night, which may result from a dependency of the emission factors on traffic composition, temperature, condensation sink or the driving mode of vehicles.

KW - Nanocluster aerosol

KW - Street canyon

KW - Traffic emissions

KW - Urban air

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 -