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| DOI | 10.1016/j.atmosenv.2020.117945 |
| Anatomy of the March 2016 severe ozone smog episode in Mexico-City | |
| Osibanjo O.O.; Rappenglück B.; Retama A. | |
| 发表日期 | 2021 |
| ISSN | 1352-2310 |
| 卷号 | 244 |
| 英文摘要 | The diurnal evolution of the planetary boundary layer (PBL) is crucial to air quality studies as it impacts the exchange and distribution of pollutants close to the surface. This paper reports continuous detection of the daytime convective boundary layer height, the stable boundary layer height, and the residual layer height as estimated from the vertical profiles of virtual potential temperature, and moisture retrieved from a microwave radiometer (MWR) in Mexico City for the period 6–18 March 2016. This period included a severe smog episode. We analyzed the anatomy of this episode utilizing continuous air quality measurements recently deployed at elevated locations surrounding the basin of Mexico City, which were used to determine the impact of the background or residual pollutants during the severe smog episode in combination with back trajectory analysis and radar wind profiles data to track transport processes within the Mexico City basin. The first few days prior to the smog episode were impacted by the passage of a deep upper tropospheric trough and strong advection. Shortly before the smog episode, daytime maximum PBL height still reached ~2.5 km above ground level but then dropped to ~1.2–1.7 km above ground level for the most severe pollution days. During the first days with strong advection, the pollutant concentrations were flushed out from the basin and/or could not accumulate (maximum hourly ozone and carbon monoxide mixing ratios of ~50 ppbv and ~0.5 ppmv, respectively). At the departure of the storm, the winds became weaker, and a strong near surface temperature inversion was observed at nighttime increasing the nighttime mixing ratio of carbon monoxide to ~2.5 ppmv and daytime ozone mixing ratio to ~200 ppbv, which resulted in one of the most severe smog episodes in Mexico City over the last decade. Our results point to strong photochemical processes confined to the PBL within the Mexico City basin, whose maximum daytime convective boundary layer heights hardly surpassed the surrounding average mountain top heights. © 2020 Elsevier Ltd |
| 关键词 | Mexico CityMicrowave radiometerPlanetary boundary layerRadar wind profilerUrban air quality |
| 语种 | 英语 |
| scopus关键词 | Advection; Air quality; Atmospheric movements; Boundary layer flow; Carbon monoxide; Microwave devices; Mixing; Ozone; Ozone layer; Air quality measurements; Back trajectory analysis; Carbon monoxide mixing ratio; Convective boundary layers; Near surface temperature; Planetary boundary layers; Pollutant concentration; Stable boundary layer heights; Boundary layers; carbon monoxide; ozone; air quality; atmospheric pollution; boundary layer; ozone; radiometer; smog; spatiotemporal analysis; troposphere; air quality; anatomical concepts; Article; boundary layer; measurement; Mexico City; photochemical smog; pollutant; priority journal; smog; surface property; temperature; wind; Federal District [Mexico]; Mexico City; Mexico [North America] |
| 来源期刊 | ATMOSPHERIC ENVIRONMENT
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| 文献类型 | 期刊论文 |
| 条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/248813 |
| 作者单位 | University of Houston, Department of Earth and Atmospheric Science, Houston, TX, United States; Dirección de Monitoreo Atmosférico, Secretaría del Medio Ambiente del Gobierno, Ciudad de México, Mexico; Now Independent Researcher, Ciudad de México, Mexico |
| 推荐引用方式 GB/T 7714 | Osibanjo O.O.,Rappenglück B.,Retama A.. Anatomy of the March 2016 severe ozone smog episode in Mexico-City[J],2021,244. |
| APA | Osibanjo O.O.,Rappenglück B.,&Retama A..(2021).Anatomy of the March 2016 severe ozone smog episode in Mexico-City.ATMOSPHERIC ENVIRONMENT,244. |
| MLA | Osibanjo O.O.,et al."Anatomy of the March 2016 severe ozone smog episode in Mexico-City".ATMOSPHERIC ENVIRONMENT 244(2021). |
| 条目包含的文件 | 条目无相关文件。 | |||||
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