DOI: 10.1016/j.atmosenv.2014.10.038
Scopus记录号: 2-s2.0-84910046776
论文题名: A budget analysis of the formation of haze in Beijing
作者: Tie X ; , Zhang Q ; , He H ; , Cao J ; , Han S ; , Gao Y ; , Li X ; , Jia X ; C
刊名: Atmospheric Environment
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2015
卷: 100 起始页码: 25
结束页码: 36
语种: 英语
英文关键词: Beijing
; PM2.5
; Weather conditions
; WRF-Chem
Scopus关键词: Beijing
; WRF-Chem
; atmospheric pressure
; boundary layer
; climate change
; haze
; numerical model
; particulate matter
; planetary atmosphere
; wind velocity
; air analysis
; air pollutant
; Article
; atmospheric pressure
; boundary layer
; budget
; calculation
; carbon footprint
; China
; cleaning
; concentration (parameters)
; controlled study
; dilution
; dynamics
; environmental economics
; haze
; meteorology
; molecular weight
; particulate matter
; planetary boundary layer
; seasonal variation
; statistical model
; velocity
; weather
; wind
; Beijing [China]
; China
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: During recent winters, hazes often occurred in Beijing, causing major environmental problems. To understand the causes of this "Beijing Haze", a haze episode (from Oct. 21 to Oct. 31, 2013) in Beijing was analyzed. During the episode, the daily mean concentration of fine particulate matter (PM2.5) reached a peak value of 270μg/m3 on Oct. 28, 2013, and rapidly decreased to 50μg/m3 the next day (Oct. 29, 2013). This strong variability provided a good opportunity to study the causes of a "Beijing Haze". Two numerical models were applied for this study. The first model is a chemical/dynamical regional model (WRF-Chem). This model is mainly used to study the effects that weather conditions have on PM2.5 concentrations in the Beijing region. The results show that the presence of high air pressure in northwest Beijing (NW-High) generally produced strong northwest winds with clean upwind air. As a result, the NW-High played an important role in cleaning Beijing's PM. However, the NW-High's cleaning effect did not occur in every situation. When there was low air pressure in southeast Beijing (SE-Low) accompanied by an NW-High, an air convergent zone appeared in Beijing. The pollutants became sandwiched, producing high PM2.5 concentrations in the Beijing region. The second model used in this study is a box model, which is applied to estimate some crucial parameters associated with the budget of PM2.5 in the Beijing region. Under calm winds, the calculations show that continuous local emissions rapidly accumulate pollutants. The PM2.5 concentrations reached 150μg/m3 and 250μg/m3 within one (1) day and two (2) days, respectively. Without horizontal dilution, this estimate can be considered as an upper time limit (the fastest time) for the occurrences of haze events in the Beijing region. The wind speed (WSb) is calculated for the balance between the continuous emissions and atmospheric clean processes. The results show that the WSb is strongly dependent on the planetary boundary layer (PBL) height and the wind direction. Under SE-Low weather conditions, the WSb is 2m/s with a higher PBL height (700m). However, under lower PBL heights, the WSb rapidly increases, reaching 4.5m/s and 7.0m/s with PBL heights of 300m and 200m, respectively. In contrast, under NW-High weather conditions, the WSb reduces to 2.5m/s and 4.0m/s. These results suggest that when the prevailing wind in Beijing is a northwest wind (with wind speeds of >4m/s), particulate matter (PM) begins to decrease. © 2014 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/82146
Appears in Collections: 气候变化事实与影响
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作者单位: Key Laboratory of Aerosol Science and Technology, SKLLQG, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an, China; National Center for Atmospheric Research, Boulder, CO, United States; Beijing Weather Modification Office, Beijing, China; Tianjin Weather Modification Office, Tianjin, China
Recommended Citation:
Tie X,, Zhang Q,, He H,et al. A budget analysis of the formation of haze in Beijing[J]. Atmospheric Environment,2015-01-01,100