The controlling factors of photochemical ozone production in Seoul, South Korea

Saewung Kim, Daun Jeong, Dianne Sanchez, Mark Wang, Roger Seco, Donald Blake, Simone Meinardi, Barbara Barletta, Stacey Hughes, Jinsang Jung, Deugsoo Kim, Gangwoong Lee, Meehye Lee, Joonyoung Ahn, Sang Deok Lee, Gangnam Cho, Min Young Sung, Yong Hwan Lee, Rokjin Park

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

We present the ambient ozone and relevant observed trace gas dataset in Seoul, South Korea, during the Megacity Air Pollution Studies (MAPS)-Seoul field campaign from May to June of 2015 (MAPS-Seoul 2015). We observed two distinctive periods, one with higher and the other with lower daytime ozone levels despite mostly clear conditions for both periods. The importance of peroxy radical contributions to excess ozone production is illustrated by the substantial differences in the Leighton constant (Φ) for the two periods. Moreover, higher levels of hydroxyl radical (OH) reactivity (s–1) were observed during the high ozone episode compared to the low ozone episode by as much as ~5 s–1. The contributions of nitrogen oxides (NOx) to OH reactivity become less important than those of volatile organic compounds (VOCs) during the high ozone episode, which suggests the NOx saturated ozone production regime. It was also notable that the biogenic VOC isoprene consistently contributed the most to OH reactivity from among the observed VOCs during the afternoon throughout the whole field campaign. Finally, we ran multiple box model scenarios to evaluate the ozone production rates of three different air mixtures: a high ozone mixture, a low ozone mixture, and a simulation of the regional air quality. The results indicate that the total OH reactivity levels and the relative contributions of VOCs to NOx play critical roles in ozone production rates. The simulated air quality mixture results in lower OH reactivity, causing lower ozone production rates than those calculated for the high ozone mixture, which clearly indicates the need for further improvements in the regional model to accurately simulate ozone precursors in the region. The results of this study suggest that a comprehensive trace gas dataset combined with observations of the OH reactivity enables us to properly diagnose the photochemistry behind ozone pollution, leading to effective ozone abatement policies.

Original languageEnglish
Pages (from-to)2253-2261
Number of pages9
JournalAerosol and Air Quality Research
Volume18
Issue number9
DOIs
Publication statusPublished - 2018 Sep 1

Fingerprint

Ozone
ozone
Volatile Organic Compounds
Nitrogen Oxides
Volatile organic compounds
volatile organic compound
Nitrogen oxides
nitrogen oxides
trace gas
Air quality
air quality
Gases
peroxy radical
Isoprene
megacity
isoprene
Photochemical reactions
photochemistry
hydroxyl radical
Air pollution

Keywords

  • Leighton constant
  • OH reactivity
  • Ozone
  • Ozone production regime

ASJC Scopus subject areas

  • Environmental Chemistry
  • Pollution

Cite this

Kim, S., Jeong, D., Sanchez, D., Wang, M., Seco, R., Blake, D., ... Park, R. (2018). The controlling factors of photochemical ozone production in Seoul, South Korea. Aerosol and Air Quality Research, 18(9), 2253-2261. https://doi.org/10.4209/aaqr.2017.11.0452

The controlling factors of photochemical ozone production in Seoul, South Korea. / Kim, Saewung; Jeong, Daun; Sanchez, Dianne; Wang, Mark; Seco, Roger; Blake, Donald; Meinardi, Simone; Barletta, Barbara; Hughes, Stacey; Jung, Jinsang; Kim, Deugsoo; Lee, Gangwoong; Lee, Meehye; Ahn, Joonyoung; Lee, Sang Deok; Cho, Gangnam; Sung, Min Young; Lee, Yong Hwan; Park, Rokjin.

In: Aerosol and Air Quality Research, Vol. 18, No. 9, 01.09.2018, p. 2253-2261.

Research output: Contribution to journalArticle

Kim, S, Jeong, D, Sanchez, D, Wang, M, Seco, R, Blake, D, Meinardi, S, Barletta, B, Hughes, S, Jung, J, Kim, D, Lee, G, Lee, M, Ahn, J, Lee, SD, Cho, G, Sung, MY, Lee, YH & Park, R 2018, 'The controlling factors of photochemical ozone production in Seoul, South Korea', Aerosol and Air Quality Research, vol. 18, no. 9, pp. 2253-2261. https://doi.org/10.4209/aaqr.2017.11.0452
Kim, Saewung ; Jeong, Daun ; Sanchez, Dianne ; Wang, Mark ; Seco, Roger ; Blake, Donald ; Meinardi, Simone ; Barletta, Barbara ; Hughes, Stacey ; Jung, Jinsang ; Kim, Deugsoo ; Lee, Gangwoong ; Lee, Meehye ; Ahn, Joonyoung ; Lee, Sang Deok ; Cho, Gangnam ; Sung, Min Young ; Lee, Yong Hwan ; Park, Rokjin. / The controlling factors of photochemical ozone production in Seoul, South Korea. In: Aerosol and Air Quality Research. 2018 ; Vol. 18, No. 9. pp. 2253-2261.
@article{4dbb28f22744405ebcdd3675306025fd,
title = "The controlling factors of photochemical ozone production in Seoul, South Korea",
abstract = "We present the ambient ozone and relevant observed trace gas dataset in Seoul, South Korea, during the Megacity Air Pollution Studies (MAPS)-Seoul field campaign from May to June of 2015 (MAPS-Seoul 2015). We observed two distinctive periods, one with higher and the other with lower daytime ozone levels despite mostly clear conditions for both periods. The importance of peroxy radical contributions to excess ozone production is illustrated by the substantial differences in the Leighton constant (Φ) for the two periods. Moreover, higher levels of hydroxyl radical (OH) reactivity (s–1) were observed during the high ozone episode compared to the low ozone episode by as much as ~5 s–1. The contributions of nitrogen oxides (NOx) to OH reactivity become less important than those of volatile organic compounds (VOCs) during the high ozone episode, which suggests the NOx saturated ozone production regime. It was also notable that the biogenic VOC isoprene consistently contributed the most to OH reactivity from among the observed VOCs during the afternoon throughout the whole field campaign. Finally, we ran multiple box model scenarios to evaluate the ozone production rates of three different air mixtures: a high ozone mixture, a low ozone mixture, and a simulation of the regional air quality. The results indicate that the total OH reactivity levels and the relative contributions of VOCs to NOx play critical roles in ozone production rates. The simulated air quality mixture results in lower OH reactivity, causing lower ozone production rates than those calculated for the high ozone mixture, which clearly indicates the need for further improvements in the regional model to accurately simulate ozone precursors in the region. The results of this study suggest that a comprehensive trace gas dataset combined with observations of the OH reactivity enables us to properly diagnose the photochemistry behind ozone pollution, leading to effective ozone abatement policies.",
keywords = "Leighton constant, OH reactivity, Ozone, Ozone production regime",
author = "Saewung Kim and Daun Jeong and Dianne Sanchez and Mark Wang and Roger Seco and Donald Blake and Simone Meinardi and Barbara Barletta and Stacey Hughes and Jinsang Jung and Deugsoo Kim and Gangwoong Lee and Meehye Lee and Joonyoung Ahn and Lee, {Sang Deok} and Gangnam Cho and Sung, {Min Young} and Lee, {Yong Hwan} and Rokjin Park",
year = "2018",
month = "9",
day = "1",
doi = "10.4209/aaqr.2017.11.0452",
language = "English",
volume = "18",
pages = "2253--2261",
journal = "Aerosol and Air Quality Research",
issn = "1680-8584",
publisher = "AAGR Aerosol and Air Quality Research",
number = "9",

}

TY - JOUR

T1 - The controlling factors of photochemical ozone production in Seoul, South Korea

AU - Kim, Saewung

AU - Jeong, Daun

AU - Sanchez, Dianne

AU - Wang, Mark

AU - Seco, Roger

AU - Blake, Donald

AU - Meinardi, Simone

AU - Barletta, Barbara

AU - Hughes, Stacey

AU - Jung, Jinsang

AU - Kim, Deugsoo

AU - Lee, Gangwoong

AU - Lee, Meehye

AU - Ahn, Joonyoung

AU - Lee, Sang Deok

AU - Cho, Gangnam

AU - Sung, Min Young

AU - Lee, Yong Hwan

AU - Park, Rokjin

PY - 2018/9/1

Y1 - 2018/9/1

N2 - We present the ambient ozone and relevant observed trace gas dataset in Seoul, South Korea, during the Megacity Air Pollution Studies (MAPS)-Seoul field campaign from May to June of 2015 (MAPS-Seoul 2015). We observed two distinctive periods, one with higher and the other with lower daytime ozone levels despite mostly clear conditions for both periods. The importance of peroxy radical contributions to excess ozone production is illustrated by the substantial differences in the Leighton constant (Φ) for the two periods. Moreover, higher levels of hydroxyl radical (OH) reactivity (s–1) were observed during the high ozone episode compared to the low ozone episode by as much as ~5 s–1. The contributions of nitrogen oxides (NOx) to OH reactivity become less important than those of volatile organic compounds (VOCs) during the high ozone episode, which suggests the NOx saturated ozone production regime. It was also notable that the biogenic VOC isoprene consistently contributed the most to OH reactivity from among the observed VOCs during the afternoon throughout the whole field campaign. Finally, we ran multiple box model scenarios to evaluate the ozone production rates of three different air mixtures: a high ozone mixture, a low ozone mixture, and a simulation of the regional air quality. The results indicate that the total OH reactivity levels and the relative contributions of VOCs to NOx play critical roles in ozone production rates. The simulated air quality mixture results in lower OH reactivity, causing lower ozone production rates than those calculated for the high ozone mixture, which clearly indicates the need for further improvements in the regional model to accurately simulate ozone precursors in the region. The results of this study suggest that a comprehensive trace gas dataset combined with observations of the OH reactivity enables us to properly diagnose the photochemistry behind ozone pollution, leading to effective ozone abatement policies.

AB - We present the ambient ozone and relevant observed trace gas dataset in Seoul, South Korea, during the Megacity Air Pollution Studies (MAPS)-Seoul field campaign from May to June of 2015 (MAPS-Seoul 2015). We observed two distinctive periods, one with higher and the other with lower daytime ozone levels despite mostly clear conditions for both periods. The importance of peroxy radical contributions to excess ozone production is illustrated by the substantial differences in the Leighton constant (Φ) for the two periods. Moreover, higher levels of hydroxyl radical (OH) reactivity (s–1) were observed during the high ozone episode compared to the low ozone episode by as much as ~5 s–1. The contributions of nitrogen oxides (NOx) to OH reactivity become less important than those of volatile organic compounds (VOCs) during the high ozone episode, which suggests the NOx saturated ozone production regime. It was also notable that the biogenic VOC isoprene consistently contributed the most to OH reactivity from among the observed VOCs during the afternoon throughout the whole field campaign. Finally, we ran multiple box model scenarios to evaluate the ozone production rates of three different air mixtures: a high ozone mixture, a low ozone mixture, and a simulation of the regional air quality. The results indicate that the total OH reactivity levels and the relative contributions of VOCs to NOx play critical roles in ozone production rates. The simulated air quality mixture results in lower OH reactivity, causing lower ozone production rates than those calculated for the high ozone mixture, which clearly indicates the need for further improvements in the regional model to accurately simulate ozone precursors in the region. The results of this study suggest that a comprehensive trace gas dataset combined with observations of the OH reactivity enables us to properly diagnose the photochemistry behind ozone pollution, leading to effective ozone abatement policies.

KW - Leighton constant

KW - OH reactivity

KW - Ozone

KW - Ozone production regime

UR - http://www.scopus.com/inward/record.url?scp=85055556864&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85055556864&partnerID=8YFLogxK

U2 - 10.4209/aaqr.2017.11.0452

DO - 10.4209/aaqr.2017.11.0452

M3 - Article

AN - SCOPUS:85055556864

VL - 18

SP - 2253

EP - 2261

JO - Aerosol and Air Quality Research

JF - Aerosol and Air Quality Research

SN - 1680-8584

IS - 9

ER -