Characteristics of Winter Atmospheric Mixing Layer Height in Beijing-Tianjin-Hebei Region and Their Relationship with the Atmospheric Pollution

• Published in: Huanjing kexue Vol. 36; no. 6; p. 1935
• Main Authors: Li, Meng, Tang, Gui-qian, Huang, Jun, Liu, Zi-rui, An, Jun-lin, Wang, Yue-si
• Format: Journal Article
• Language: Chinese
• Published: China 01.06.2015
• Subjects: Air Pollutants - analysis; China; Environmental Monitoring; Environmental Pollution; Particulate Matter; Seasons; Wind; China
• ISSN: 0250-3301
• DOI: 10.13227/j.hjkx.2015.06.004

Atmospheric mixing layer height (MLH) is one of the main factors affecting the atmospheric diffusion and plays an important role in air quality assessment and distribution of the pollutants. Based on the ceilometers data, this paper has made synchronous observation on MLH in Beijing-Tianjin-Hebei region (Beijing, Tianjin, Shijiazhuang and Qinhuangdao) in heavy polluted February 2014 and analyzed the respective overall change and its regional features. Results show that in February 2014,the average of mixing layer height in Qinhuangdao is the highest, up to 865 +/- 268 m, and in Shijiazhuang is the lowest (568 +/- 207 m), Beijing's and Tianjin's are in between, 818 +/- 319 m and 834 +/- 334 m respectively; Combined with the meteorological data, we find that radiation and wind speed are main factors of the mixing layer height; The relationship between the particle concentration and mixing layer height in four sites suggests that mixing layer is less than 800 m, concentration of fine particulate matter in four s