Impacts of land-surface forcing on local meteorology and ozone concentrations in a heavily industrialized coastal urban area
In this study, the Weather Research and Forecasting/Community Multiscale Air Quality (WRF-CMAQ) model was used to investigate the interaction of urban land-surface forcing with local circulations and the impact on boundary layer ozone concentrations in southern Taiwan at an urban-scale resolution. T...
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| Format: | Article |
| Language: | English English |
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Elsevier B.V.
2022
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| Online Access: | https://eprints.ums.edu.my/id/eprint/34321/1/Abstract.pdf https://eprints.ums.edu.my/id/eprint/34321/3/Full-text.pdf |
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| author | Chang, Jackson Hian Wui Stephen M.Griffith Neng-HueiLin |
| author_facet | Chang, Jackson Hian Wui Stephen M.Griffith Neng-HueiLin |
| author_sort | Chang, Jackson Hian Wui |
| collection | UMS |
| description | In this study, the Weather Research and Forecasting/Community Multiscale Air Quality (WRF-CMAQ) model was used to investigate the interaction of urban land-surface forcing with local circulations and the impact on boundary layer ozone concentrations in southern Taiwan at an urban-scale resolution. Two simulations were performed with the same emissions but different land cover designations. URBAN was the baseline simulation representing the current urbanized condition, while NO-URBAN replaced all urban grid cells with cropland. The interaction of the sea-breeze with the urban-heat-island (UHI) convergent flow during the daytime in URBAN transports near-surface O₃ precursors to the upper planetary boundary layer (PBL). When the UHI convergent flow stalls over the city center, a circulation flow is formed and traps the pollutants at an elevated height, increasing the reaction rate of hydroxyl radical with volatile organic compounds by 2.0–4.0 ppbv h−1 at 1000–1500 m. At nighttime, the deeper boundary layer of URBAN diluted the NOx mixing ratio by ~17 ppbv and weakened the titration effect, contributing to higher O₃ by +15 ppbv in the urban area. However, once the daytime vertical mixing diminished, the O₃ aloft also diffused downward to the surface level and further degraded the nighttime air quality. |
| first_indexed | 2024-03-06T03:20:39Z |
| format | Article |
| id | ums.eprints-34321 |
| institution | Universiti Malaysia Sabah |
| language | English English |
| last_indexed | 2024-03-06T03:20:39Z |
| publishDate | 2022 |
| publisher | Elsevier B.V. |
| record_format | dspace |
| spelling | ums.eprints-343212022-09-27T03:51:47Z https://eprints.ums.edu.my/id/eprint/34321/ Impacts of land-surface forcing on local meteorology and ozone concentrations in a heavily industrialized coastal urban area Chang, Jackson Hian Wui Stephen M.Griffith Neng-HueiLin QC851-999 Meteorology. Climatology Including the earth's atmosphere In this study, the Weather Research and Forecasting/Community Multiscale Air Quality (WRF-CMAQ) model was used to investigate the interaction of urban land-surface forcing with local circulations and the impact on boundary layer ozone concentrations in southern Taiwan at an urban-scale resolution. Two simulations were performed with the same emissions but different land cover designations. URBAN was the baseline simulation representing the current urbanized condition, while NO-URBAN replaced all urban grid cells with cropland. The interaction of the sea-breeze with the urban-heat-island (UHI) convergent flow during the daytime in URBAN transports near-surface O₃ precursors to the upper planetary boundary layer (PBL). When the UHI convergent flow stalls over the city center, a circulation flow is formed and traps the pollutants at an elevated height, increasing the reaction rate of hydroxyl radical with volatile organic compounds by 2.0–4.0 ppbv h−1 at 1000–1500 m. At nighttime, the deeper boundary layer of URBAN diluted the NOx mixing ratio by ~17 ppbv and weakened the titration effect, contributing to higher O₃ by +15 ppbv in the urban area. However, once the daytime vertical mixing diminished, the O₃ aloft also diffused downward to the surface level and further degraded the nighttime air quality. Elsevier B.V. 2022 Article PeerReviewed text en https://eprints.ums.edu.my/id/eprint/34321/1/Abstract.pdf text en https://eprints.ums.edu.my/id/eprint/34321/3/Full-text.pdf Chang, Jackson Hian Wui and Stephen M.Griffith and Neng-HueiLin (2022) Impacts of land-surface forcing on local meteorology and ozone concentrations in a heavily industrialized coastal urban area. Urban Climate, 45. p. 1. ISSN 2212-0955 https://www.sciencedirect.com/science/article/abs/pii/S2212095522001754 https://doi.org/10.1016/j.uclim.2022.101257 https://doi.org/10.1016/j.uclim.2022.101257 |
| spellingShingle | QC851-999 Meteorology. Climatology Including the earth's atmosphere Chang, Jackson Hian Wui Stephen M.Griffith Neng-HueiLin Impacts of land-surface forcing on local meteorology and ozone concentrations in a heavily industrialized coastal urban area |
| title | Impacts of land-surface forcing on local meteorology and ozone concentrations in a heavily industrialized coastal urban area |
| title_full | Impacts of land-surface forcing on local meteorology and ozone concentrations in a heavily industrialized coastal urban area |
| title_fullStr | Impacts of land-surface forcing on local meteorology and ozone concentrations in a heavily industrialized coastal urban area |
| title_full_unstemmed | Impacts of land-surface forcing on local meteorology and ozone concentrations in a heavily industrialized coastal urban area |
| title_short | Impacts of land-surface forcing on local meteorology and ozone concentrations in a heavily industrialized coastal urban area |
| title_sort | impacts of land surface forcing on local meteorology and ozone concentrations in a heavily industrialized coastal urban area |
| topic | QC851-999 Meteorology. Climatology Including the earth's atmosphere |
| url | https://eprints.ums.edu.my/id/eprint/34321/1/Abstract.pdf https://eprints.ums.edu.my/id/eprint/34321/3/Full-text.pdf |
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