Air quality deterioration episode associated with a typhoon over the complex topographic environment in central Taiwan Article Swipe
Chuan‐Yao Lin
,
Yang‐Fan Sheng
,
Wan‐Chin Chen
,
Charles C.‐K. Chou
,
Yi-Yun Chien
,
Wen‐Mei Chen
·
YOU?
·
· 2021
· Open Access
·
· DOI: https://doi.org/10.5194/acp-21-16893-2021
YOU?
·
· 2021
· Open Access
·
· DOI: https://doi.org/10.5194/acp-21-16893-2021
Air pollution is typically at its lowest in Taiwan during summer. The mean concentrations of PM10, PM2.5, and daytime ozone (08:00–17:00 LST) during summer (June–August) over central Taiwan were 35–40 µg m−3, 18–22 µg m−3, and 30–42 ppb, respectively, between 2004 and 2019. Sampling analysis revealed that the contribution of organic carbon (OC) to PM2.5 could have exceeded 30 % in urban and inland mountain sites during July in 2017 and 2018. Frequent episodes of air quality deterioration occur over the western plains of Taiwan when an easterly typhoon circulation interacts with the complex topographic structure of the island. We explored an episode of air quality deterioration that was associated with a typhoon between 15 and 17 July 2018 using the Weather Research Forecasting with Chemistry (WRF-Chem) model. The results indicated that the continual formation of low-pressure systems or typhoons in the area between Taiwan and Luzon island in the Philippines provided a strong easterly ambient flow, which lasted for an extended period between 15 and 17 July. The interaction between the easterly flow and Taiwan's Central Mountain Range (CMR) resulted in stable weather conditions and weak wind speed in western Taiwan during the study period. Numerical modeling also indicated that a lee side vortex easily formed, and the wind direction could have changed from southwesterly to northwesterly over central Taiwan because of the interaction between the typhoon circulation and the CMR. The northwesterly wind coupled with a sea breeze was conducive to the transport of air pollutants from the coastal upstream industrial and urban areas to the inland area. The dynamic process for the wind direction changed given a reasonable explanation for why the observed SO42- became the major contributor to PM2.5 during the episode. SO42- contribution proportions (%) to PM2.5 at the coastal, urban, and mountain sites were 9.4 µg m−3 (30.5 %), 12.1 µg m−3 (29.9 %), and 11.6 µg m−3 (29.7 %), respectively. Moreover, the variation of the boundary layer height had a strong effect on the concentration level of both PM2.5 and ozone. The lee vortex and land–sea breeze, as well as the boundary layer development, were the key mechanisms in air pollutant accumulation and transport. As typhoons frequently occur around Taiwan during summer and fall, their effect on the island's air quality merits further research attention.
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Metadata
- Type
- article
- Language
- en
- Landing Page
- https://doi.org/10.5194/acp-21-16893-2021
- OA Status
- gold
- Cited By
- 28
- References
- 48
- Related Works
- 10
- OpenAlex ID
- https://openalex.org/W3141691333
All OpenAlex metadata
Raw OpenAlex JSON
- OpenAlex ID
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https://openalex.org/W3141691333Canonical identifier for this work in OpenAlex
- DOI
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https://doi.org/10.5194/acp-21-16893-2021Digital Object Identifier
- Title
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Air quality deterioration episode associated with a typhoon over the complex topographic environment in central TaiwanWork title
- Type
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articleOpenAlex work type
- Language
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enPrimary language
- Publication year
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2021Year of publication
- Publication date
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2021-11-19Full publication date if available
- Authors
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Chuan‐Yao Lin, Yang‐Fan Sheng, Wan‐Chin Chen, Charles C.‐K. Chou, Yi-Yun Chien, Wen‐Mei ChenList of authors in order
- Landing page
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https://doi.org/10.5194/acp-21-16893-2021Publisher landing page
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YesWhether a free full text is available
- OA status
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goldOpen access status per OpenAlex
- OA URL
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https://doi.org/10.5194/acp-21-16893-2021Direct OA link when available
- Concepts
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Typhoon, Weather Research and Forecasting Model, Climatology, Environmental science, Air quality index, Wind direction, Sea breeze, Wind speed, Daytime, Meteorology, Atmospheric sciences, Geology, GeographyTop concepts (fields/topics) attached by OpenAlex
- Cited by
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28Total citation count in OpenAlex
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2025: 5, 2024: 5, 2023: 5, 2022: 12, 2021: 1Per-year citation counts (last 5 years)
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48Number of works referenced by this work
- Related works (count)
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10Other works algorithmically related by OpenAlex
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