DOI: 10.1016/j.atmosenv.2014.04.014
Scopus记录号: 2-s2.0-84899138832
论文题名: Sources of carbonaceous aerosol in the free troposphere
作者: Timonen H ; , Jaffe D ; A ; , Wigder N ; , Hee J ; , Gao H ; , Pitzman L ; , Cary R ; A
刊名: Atmospheric Environment
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2014
卷: 92 起始页码: 146
结束页码: 153
语种: 英语
英文关键词: Elemental carbon
; Free troposphere
; Organic carbon
; Particulatec matter
Scopus关键词: Aerosols
; Biomass
; Carbon
; Organic carbon
; Asian long-range transport
; Average concentration
; Carbonaceous aerosol
; Elemental carbon
; Fine particulate matter
; Free troposphere
; Particulatec matter
; Pollution episodes
; Troposphere
; carbon
; elemental carbon
; organic carbon
; unclassified drug
; aerosol composition
; air mass
; atmospheric plume
; atmospheric pollution
; biomass burning
; organic carbon
; particulate matter
; spatiotemporal analysis
; troposphere
; ventilation
; aerosol
; air pollution
; article
; biomass
; boundary layer
; carbon source
; free troposphere
; measurement
; particulate matter
; priority journal
; secondary organic aerosol
; troposphere
; United States
; Cascade Range
; Mount Bachelor
; Oregon
; United States
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: In this study concentrations of organic (OC) and elemental carbon (EC) from free tropospheric (FT) fine particulate matter (PM) were measured from March to September, 2012 with a Semi-Continuous OC/EC carbon aerosol analyzer at the top of Mt. Bachelor (2.8kma.s.l) in Central Oregon, U.S. The average concentrations of OC and EC in the FT were low (OC: 1.87±6.10, EC: 0.07±0.26μgm-3; average±SD) but much higher during specific pollution episodes. During springtime the highest OC and EC concentrations were measured for dry free tropospheric air masses, whereas during summertime the highest OC and EC concentrations were typically measured for more humid air masses that were uplifted from the boundary layer (BL). The highest OC and EC concentrations were measured during biomass burning episodes (3h average OC: up to 146.0μgm-3, EC up to 5.5μgm-3). Elevated OC and EC concentrations were also measured during Asian Long Range Transport (LRT) episodes (OC: up to 3.6μgm-3, EC up to1.1μgm-3). In addition, between episodes, an increase in OC was seen in the afternoon, possibly due to SOA formation. This SOA can then be exported to the FT via diurnal ventilation of the BL. For Asian LRT episodes the OC/EC ratios varied between 8 and 34, with an average of 17.9. For local biomass burning emissions OC/EC ratios were between 25 and 30. Higher OC/EC ratios (30-40) were observed for the biomass burning plumes originating from longer distances, possibly due to SOA formation. © 2014 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/81264
Appears in Collections: 气候变化事实与影响
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作者单位: Science and Technology Program, University of Washington-Bothell, Bothell, WA, United States; Air Quality Research, Finnish Meteorological Institute, Helsinki, Finland; Department of Atmospheric Sciences, University of Washington, Seattle, WA, United States; Sunset Laboratory Inc., Portland, OR, United States
Recommended Citation:
Timonen H,, Jaffe D,A,et al. Sources of carbonaceous aerosol in the free troposphere[J]. Atmospheric Environment,2014-01-01,92