DOI: 10.1016/j.atmosenv.2014.08.078
Scopus记录号: 2-s2.0-84907079694
论文题名: Characteristics and formation mechanism of a winter haze-fog episode in Tianjin, China
作者: Han S ; -Q ; , Wu J ; -H ; , Zhang Y ; -F ; , Cai Z ; -Y ; , Feng Y ; -C ; , Yao Q ; , Li X ; -J ; , Liu Y ; -W ; , Zhang M
刊名: Atmospheric Environment
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2014
卷: 98 起始页码: 323
结束页码: 330
语种: 英语
英文关键词: Accumulation
; Formation mechanism
; Haze-fog episode
; Meteorological conditions
; Secondary formation
Scopus关键词: Accumulation
; Formation mechanism
; Haze-fog episode
; Meteorological condition
; Secondary formation
; black carbon
; carbon
; nitrate
; nitrous oxide
; organic carbon
; sulfate
; sulfur dioxide
; total carbon
; unclassified drug
; absorption
; air mass
; black carbon
; diffusion
; fog
; formation mechanism
; haze
; organic carbon
; pollutant
; relative humidity
; scattering
; winter
; absorption
; aerosol
; air
; air pollutant
; Article
; atmospheric dispersion
; bioaccumulation
; China
; controlled study
; diffusion
; fog
; gas
; haze
; humidity
; meteorology
; molecular weight
; particulate matter
; seasonal variation
; visibility
; wind
; winter
; China
; Tianjin
Scopus学科分类: Environmental Science: Water Science and Technology
; Earth and Planetary Sciences: Earth-Surface Processes
; Environmental Science: Environmental Chemistry
英文摘要: Several heavy haze and fog episodes occurred in northern China in January of 2013. Data were collected and used to analyze the characteristics and mechanisms of formation of the haze-fog (HF) episode that occurred from January 10 to 12. The minimum hourly visibility was 112 m, as recorded on 12 January. The concentrations of particulate and gaseous pollutants increased continuously during this HF period. The concentration of PM2.5 increased faster than that of SO2 and NOx, and the rate of accumulation was greater at the beginning of the HF process than at other times. The average concentration of PM2.5, PM10, NOx, and SO2 on the HF days was 3.9, 3.6, 2.5, and 2.1 times higher than the values in the non-haze days. The scattering and absorption coefficients σsp and σap on the HF days were 4.0 and 4.3 times higher than the values in the non-HF days. The highest black carbon (BC) concentration was about 10 times higher than on the non-HF days. The concentrations of total carbon (TC), organic carbon (OC), and elemental carbon (EC) all increased, and the speed of the increase in OC was quicker than that of the EC. An increase in secondary inorganic pollutants (SO4 2-, NO3 -) in PM2.5 was also observed. The concentrations of SO4 2- and NO3 - on the HF days were 4 and 2 times those of the non-HF days. The increase in relative humidity on the HF days favored the formation of sulfate and nitrate during HF episode. Unfavorable meteorological conditions were the external cause of this HF episode. The southwest wind transported the pollutants from areas to the south of the study regions at the beginning of the HF episode. After the HF took shape, a strong descending air mass located in the high layer severely limited pollutant diffusion in the vertical direction. The strong temperature inversion and the weak horizontal wind limited the horizontal and vertical dispersion of pollutants. The high layer transport of the pollutants during the early period and the late accumulation of pollutants and the secondary formation of aerosols were important mechanisms for causing the formation of this HF episode. © 2014 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/80536
Appears in Collections: 气候变化事实与影响
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作者单位: Tianjin Institute of Meteorological Science, No. 100 Qi Xiang Tai Road, Tianjin, China; State Env. Prot. Key Lab. of Urban Ambient Air Particulate Matter Pollution Prevention and Control, College of Environmental Science and Engineering, Nankai University, No. 94 Weijin Road, Tianjin, China; Tianjin Meteorological Station, No. 100 Qi Xiang Tai Road, Tianjin, China
Recommended Citation:
Han S,-Q,, Wu J,et al. Characteristics and formation mechanism of a winter haze-fog episode in Tianjin, China[J]. Atmospheric Environment,2014-01-01,98