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Characteristics of wintertime particulate pollution and their relationships with atmospheric boundary layer meteorology: A case study in the Pearl River Delta
| 题名： | Characteristics of wintertime particulate pollution and their relationships with atmospheric boundary layer meteorology: A case study in the Pearl River Delta |
| 正文语种： | 中文 |
| 作者： | Zhiheng Liao Shaojia Fan Xiaofeng Huang |
| 作者单位： | School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou, hina;South hina Institute of Environmental Sciences, Ministry of Environmental Protection, Guangzhou 510655, hina School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou, hina Key Laboratory for Urban Habitat Environmental Science and Technology, School of Environment and Energy, Peking University Shenzhen Graduate School, Shenzhen, hina |
| 关键词： | PM1 surface inversion atmospheric boundary layer Pearl River Delta region |
| 摘要： | The Pearl River Delta (PRD) region in South China is one of the most economically developed regions in China while also noted for its severe air pollution,especially during the winter season.In order to characterize the features and the formation mechanism of wintertime particulate pollution in the PRD region, continuous measurements of PM1 chemical compositions were performed at an urban monitoring site,along with atmospheric boundary layer (ABL) measurement at a nearby site.During the campaign, the mean measured PM1 mass concentration was 56.1 μg m-3 which composed of organic matter (41.0%), sulfate (23.2%), nitrate (13.9%), ammonium (10.5%), black carbon (measured by aethalometer, 9.3%) and chloride (2.1%).Correlation analysis revealed a significant correlation between OM and NOx, indicating high contribution from mobile emissions.In contrast, NO3-/SO42-had weak correlation with NOx/SO2, which suggested secondary inorganic aerosol contributed little to aerosol formation.In the absence of substantial secondary production, the high-level pollution was mostly affected by the accumulation process associated with the stagnant meteorology.The ABL measurement showed the decreasing wind speed, local circulation and thin surface inversion resulted in the high-level accumulations of pollutants.Overall, the mean height of ABL in nighttime was ~150 m, while in daytime the maximal value was about 900m.Analysis of the diumal variation of PM1 showed minimum concentration in the afternoon was caused by dilution as a result of an increase in the ABL height.The maximum concentration of PM1 in the evening was the results of an increase in traffic intensity during the evening rush hour together with a decrease in the mixing layer height, wind speed and temperature. |
| 会议日期： | 20151222 |
| 会议举办地点： | 西安 |
| 会议名称： | 细颗粒物污染防治与环境健康影响国际研讨会 |
| 出版日期： | 2015-12-22 |
| 母体文献： | 细颗粒物污染防治与环境健康影响国际研讨会论文集 |
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