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| DOI | 10.1016/j.atmosenv.2018.11.035 |
| Measurements of submicron particles vertical profiles by means of topographic relief in a typical valley city, China | |
| Zhao S.; Yu Y.; Qin D.; Yin D.; Du Z.; Li J.; Dong L.; He J.; Li P. | |
| 发表日期 | 2019 |
| ISSN | 13522310 |
| 卷号 | 199 |
| 英文摘要 | To reveal PM1 vertical profiles and key affecting factors in a typical urban valley, daytime and nighttime PM1 (the particles with diameters less than 1 μm) samples were collected with medium volume air samplers during 26 December 2017 to 11 January 2018 at five different altitudes by means of high topographic relief at urban areas of Lanzhou. The synchronous boundary layer temperature and humidity profiles were observed by a microwave radiometer. Daytime PM1 concentrations reduced by about 3.86 μg m−3 when the height above the surface increased by 100 m, which was much lower than that for nighttime (5.68 μg m−3 100 m−1) as particles were easily accumulated near the surface when the air was stable during the nighttime. The three typical PM1 vertical profiles were identified by K-means clustering technique. The most frequent cluster with elevated PM1 concentrations near the surface was closely related to temperature inversion around the ground, while the cluster with relatively uniform PM1 within the boundary layer was mainly induced by unstable atmospheric stratification and thus relatively good vertical dispersion. About 50%–60% of PM1 variations could be attributed to atmospheric stratification near the surface in the valley city, which was much higher than that at the hilltop. The PM1 difference increased by 47.14 (36.91) μg m−3 when inversion layer thickness (intensity) increased by 100 m (1 °C 100 m−1). The newly calculated inversion index considering both inversion layer thickness and intensity explained about 87% of PM1 differences between near the surface and at the hilltop. The vertical dispersion had a more significant effect on PM1 than horizontal dispersion near the surface, while PM1 was more largely affected by horizontal dispersion at the hilltop, which was closely related to the valley terrain. © 2018 Elsevier Ltd |
| 英文关键词 | Boundary layer; PM1; Valley city; Vertical variations |
| URL | https://www2.scopus.com/inward/record.uri?eid=2-s2.0-85056785274&doi=10.1016%2fj.atmosenv.2018.11.035&partnerID=40&md5=a0414ef996b10fdab8d070fbe2b73337 |
| 语种 | 英语 |
| scopus关键词 | Atmospheric humidity; Atmospheric movements; Boundary layer flow; Boundary layers; Inversion layers; Landforms; Microwave devices; Atmospheric stratification; Boundary layer temperature; K-means clustering techniques; Microwave radiometers; Sub-micron particles; Temperature inversions; Valley city; Vertical variation; Atmospheric boundary layer; air sampling; boundary layer; concentration (composition); dispersion; measurement method; microwave radiometer; particulate matter; stratification; topography; urban area; urban pollution; vertical profile; air pollutant; air sampling; air temperature; Article; boundary layer; China; cluster analysis; humidity; meteorology; microwave radiation; particulate matter; principal component analysis; priority journal; stratification; submicron particle; surface property; temperature; troposphere; urban area; wind speed; China; Gansu; Lanzhou |
| 来源期刊 | Atmospheric Environment
 |
| 来源机构 | 中国科学院西北生态环境资源研究院 |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/77322 |
| 推荐引用方式 GB/T 7714 | Zhao S.； Yu Y.； Qin D.； Yin D.； Du Z.； Li J.； Dong L.； He J.； Li P.. Measurements of submicron particles vertical profiles by means of topographic relief in a typical valley city, China[J]. 中国科学院西北生态环境资源研究院,2019,199. |
| APA | Zhao S.； Yu Y.； Qin D.； Yin D.； Du Z.； Li J.； Dong L.； He J.； Li P..(2019).Measurements of submicron particles vertical profiles by means of topographic relief in a typical valley city, China.Atmospheric Environment,199. |
| MLA | Zhao S.； Yu Y.； Qin D.； Yin D.； Du Z.； Li J.； Dong L.； He J.； Li P.."Measurements of submicron particles vertical profiles by means of topographic relief in a typical valley city, China".Atmospheric Environment 199(2019). |
| 条目包含的文件 | 条目无相关文件。 | |||||
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