DOI: 10.1016/j.atmosenv.2015.09.005
Scopus记录号: 2-s2.0-84941265448
论文题名: Diurnal and seasonal variation of the PM2.5 apparent particle density in Beijing, China
作者: Liu Z ; , Hu B ; , Ji D ; , Wang Y ; , Wang M ; , Wang Y
刊名: Atmospheric Environment
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2015
卷: 120 起始页码: 328
结束页码: 338
语种: 英语
英文关键词: Apparent density
; Fine particles
; Material density
; Morphology
Scopus关键词: Balloons
; Boundary layers
; Morphology
; Apparent density
; Dynamic measurement system
; Fine particles
; Material density
; Particle number size distribution
; Scanning mobility particle sizer
; Seasonal and diurnal variations
; Tapered element oscillating microbalances
; Coal combustion
; coal
; aerosol property
; boundary layer
; combustion
; concentration (composition)
; heating
; particulate matter
; seasonal variation
; size distribution
; soot
; aerosol
; Article
; boundary layer
; chemical composition
; China
; circadian rhythm
; cold
; combustion
; density
; ecological equipment
; heating
; mass
; meteorology
; particle size
; priority journal
; scanning mobility particle sizer
; seasonal variation
; summer
; tapered element oscillating microbalance with a filter dynamic measurement system
; winter
; 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: To characterize the features of particle apparent density and its correlation with chemical composition and meteorological conditions, continuous measurements of particle number size distributions and particle mass concentrations were conducted in the winter and summer periods in Beijing using a Scanning Mobility Particle Sizer and a Tapered Element Oscillating Microbalance with a Filter Dynamic Measurement System. The apparent density, as determined by the particle mass to volume ratios, showed strong seasonal and diurnal variations, with higher values were observed during the warm season (1.60 ± 0.43 g cm-3, July to September 2014) compared to the cold season (1.41 ± 0.40 g cm-3, November 2013 to January 2014). A minimum in the morning and afternoon rush hours was observed in both seasons, representing fresh primary aerosol emissions, which were related to soot particles with low density due to their agglomerate structure, especially observed in the late afternoon hours of the cold season (approximately 1.3 g cm-3) when traffic emissions combined with the coal combustion for heating supply. The highest values were found during midday (approximately 1.8 g cm-3) in the warm season, likely due to increased secondary particle production and the presence of more aged particles with a build-up of the convectively mixed boundary layer. The apparent particle density has the potential to serve as a crude tracer for chemical composition and atmospheric processing and might play an important role when considering the associations between health effects and ambient particles. © 2015 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/81479
Appears in Collections: 气候变化事实与影响
There are no files associated with this item.
作者单位: State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry (LAPC), Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, China
Recommended Citation:
Liu Z,, Hu B,, Ji D,et al. Diurnal and seasonal variation of the PM2.5 apparent particle density in Beijing, China[J]. Atmospheric Environment,2015-01-01,120