The Impact of the Urban Heat Island Effect on Ground-Level Ozone Pollution in the Sichuan Basin, China

With urbanization, ozone (O<sub>3</sub>) pollution and the urban heat island (UHI) effect have become increasingly prominent. UHI can affect O<sub>3</sub> production and its dilution and dispersion, but the underlying mechanisms remain unclear. This study investigates the spa...

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Main Authors: Xingtao Song, Haoyuan Shi, Langchang Jin, Sijing Pang, Shenglan Zeng
Format: Article
Language:English
Published: MDPI AG 2024-12-01
Series:Atmosphere
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Online Access:https://www.mdpi.com/2073-4433/16/1/14
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author Xingtao Song
Haoyuan Shi
Langchang Jin
Sijing Pang
Shenglan Zeng
author_facet Xingtao Song
Haoyuan Shi
Langchang Jin
Sijing Pang
Shenglan Zeng
author_sort Xingtao Song
collection DOAJ
description With urbanization, ozone (O<sub>3</sub>) pollution and the urban heat island (UHI) effect have become increasingly prominent. UHI can affect O<sub>3</sub> production and its dilution and dispersion, but the underlying mechanisms remain unclear. This study investigates the spatial and temporal distribution of O<sub>3</sub> pollution and the UHI effect, as well as the influence of UHI on O<sub>3</sub> pollution in the Sichuan Basin. Atmospheric pollution data for O<sub>3</sub> and NO<sub>2</sub> from 2020 were obtained from local environmental monitoring stations, while temperature and single-layer wind field data were sourced from ERA5-Land, a high-resolution atmospheric reanalysis dataset provided by the European Centre for Medium-Range Weather Forecasts (ECMWF). The results indicate the following: (1) O<sub>3</sub> concentrations in the Sichuan Basin exhibit distinct seasonal variations, with the highest levels in spring, followed by summer and autumn, and the lowest in winter. In terms of spatial variation, the overall distribution is highest in western Sichuan, second highest along the Sichuan River, and lowest in central Sichuan. (2) There are significant regional differences in UHII across Sichuan, with medium heat islands (78.63%) dominating western Sichuan, weak heat islands (82.74%) along the Sichuan River, and no heat island (34.79%) or weak heat islands (63.56%) in central Sichuan. Spatially, UHII is mainly distributed in a circular pattern. (3) Typical cities in the Sichuan Basin (Chengdu, Chongqing, Nanchong) show a positive correlation between UHII and O<sub>3</sub> concentration (0.071–0.499), though with an observed temporal lag. This study demonstrates that UHI can influence O<sub>3</sub> concentrations in two ways: first, by altering local heat balance, thereby promoting O<sub>3</sub> production, and second, by generating local winds that contribute to the diffusion or accumulation of O<sub>3</sub>, forming distinct O<sub>3</sub> concentration zones.
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spelling doaj-art-2d8c78e3524e44cdab925bd5554dde362025-01-24T13:21:42ZengMDPI AGAtmosphere2073-44332024-12-011611410.3390/atmos16010014The Impact of the Urban Heat Island Effect on Ground-Level Ozone Pollution in the Sichuan Basin, ChinaXingtao Song0Haoyuan Shi1Langchang Jin2Sijing Pang3Shenglan Zeng4Plateau Atmosphere and Environment Key Laboratory of Sichuan Province, School of Atmospheric Sciences, Chengdu Plain Urban Meteorology and Environment Observation and Research Station of Sichuan Province, Chengdu University of Information Technology, Chengdu 610225, ChinaPlateau Atmosphere and Environment Key Laboratory of Sichuan Province, School of Atmospheric Sciences, Chengdu Plain Urban Meteorology and Environment Observation and Research Station of Sichuan Province, Chengdu University of Information Technology, Chengdu 610225, ChinaPlateau Atmosphere and Environment Key Laboratory of Sichuan Province, School of Atmospheric Sciences, Chengdu Plain Urban Meteorology and Environment Observation and Research Station of Sichuan Province, Chengdu University of Information Technology, Chengdu 610225, ChinaPlateau Atmosphere and Environment Key Laboratory of Sichuan Province, School of Atmospheric Sciences, Chengdu Plain Urban Meteorology and Environment Observation and Research Station of Sichuan Province, Chengdu University of Information Technology, Chengdu 610225, ChinaPlateau Atmosphere and Environment Key Laboratory of Sichuan Province, School of Atmospheric Sciences, Chengdu Plain Urban Meteorology and Environment Observation and Research Station of Sichuan Province, Chengdu University of Information Technology, Chengdu 610225, ChinaWith urbanization, ozone (O<sub>3</sub>) pollution and the urban heat island (UHI) effect have become increasingly prominent. UHI can affect O<sub>3</sub> production and its dilution and dispersion, but the underlying mechanisms remain unclear. This study investigates the spatial and temporal distribution of O<sub>3</sub> pollution and the UHI effect, as well as the influence of UHI on O<sub>3</sub> pollution in the Sichuan Basin. Atmospheric pollution data for O<sub>3</sub> and NO<sub>2</sub> from 2020 were obtained from local environmental monitoring stations, while temperature and single-layer wind field data were sourced from ERA5-Land, a high-resolution atmospheric reanalysis dataset provided by the European Centre for Medium-Range Weather Forecasts (ECMWF). The results indicate the following: (1) O<sub>3</sub> concentrations in the Sichuan Basin exhibit distinct seasonal variations, with the highest levels in spring, followed by summer and autumn, and the lowest in winter. In terms of spatial variation, the overall distribution is highest in western Sichuan, second highest along the Sichuan River, and lowest in central Sichuan. (2) There are significant regional differences in UHII across Sichuan, with medium heat islands (78.63%) dominating western Sichuan, weak heat islands (82.74%) along the Sichuan River, and no heat island (34.79%) or weak heat islands (63.56%) in central Sichuan. Spatially, UHII is mainly distributed in a circular pattern. (3) Typical cities in the Sichuan Basin (Chengdu, Chongqing, Nanchong) show a positive correlation between UHII and O<sub>3</sub> concentration (0.071–0.499), though with an observed temporal lag. This study demonstrates that UHI can influence O<sub>3</sub> concentrations in two ways: first, by altering local heat balance, thereby promoting O<sub>3</sub> production, and second, by generating local winds that contribute to the diffusion or accumulation of O<sub>3</sub>, forming distinct O<sub>3</sub> concentration zones.https://www.mdpi.com/2073-4433/16/1/14air pollutionO<sub>3</sub> concentrationUHIUHIIcorrelation analysis
spellingShingle Xingtao Song
Haoyuan Shi
Langchang Jin
Sijing Pang
Shenglan Zeng
The Impact of the Urban Heat Island Effect on Ground-Level Ozone Pollution in the Sichuan Basin, China
Atmosphere
air pollution
O<sub>3</sub> concentration
UHI
UHII
correlation analysis
title The Impact of the Urban Heat Island Effect on Ground-Level Ozone Pollution in the Sichuan Basin, China
title_full The Impact of the Urban Heat Island Effect on Ground-Level Ozone Pollution in the Sichuan Basin, China
title_fullStr The Impact of the Urban Heat Island Effect on Ground-Level Ozone Pollution in the Sichuan Basin, China
title_full_unstemmed The Impact of the Urban Heat Island Effect on Ground-Level Ozone Pollution in the Sichuan Basin, China
title_short The Impact of the Urban Heat Island Effect on Ground-Level Ozone Pollution in the Sichuan Basin, China
title_sort impact of the urban heat island effect on ground level ozone pollution in the sichuan basin china
topic air pollution
O<sub>3</sub> concentration
UHI
UHII
correlation analysis
url https://www.mdpi.com/2073-4433/16/1/14
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