DOI: 10.1016/j.atmosenv.2015.09.022
Scopus记录号: 2-s2.0-84941286021
论文题名: Impact of primary and secondary organic sources on the oxidative potential of quasi-ultrafine particles (PM0.25) at three contrasting locations in the Los Angeles Basin
作者: Saffari A ; , Hasheminassab S ; , Wang D ; , Shafer M ; M ; , Schauer J ; J ; , Sioutas C
刊名: Atmospheric Environment
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2015
卷: 120 起始页码: 286
结束页码: 296
语种: 英语
英文关键词: CMB
; Oxidative potential
; Particulate matter
; Photochemical aging
; Ultrafine
Scopus关键词: Aerosols
; Amphibious vehicles
; Aromatic hydrocarbons
; Beaches
; Carbon
; Crashworthiness
; Geographical regions
; Landforms
; Location
; Multivariant analysis
; Particles (particulate matter)
; Particulate emissions
; Polycyclic aromatic hydrocarbons
; Regression analysis
; CMB
; Multivariate regression analysis
; Oxidative potential
; Particulate Matter
; Secondary organic aerosols
; Spatial and temporal variation
; Ultrafine
; Water-soluble organic carbon
; Organic carbon
; chemical compound
; molecular marker
; organic carbon
; polycyclic aromatic hydrocarbon
; reactive oxygen metabolite
; aerosol
; beach
; emission inventory
; oxidation
; particle size
; particulate matter
; photochemistry
; pollutant source
; pollution monitoring
; spatiotemporal analysis
; urban atmosphere
; urban pollution
; air quality
; Article
; atmosphere
; chemical composition
; macrophage
; oxidation reduction potential
; particulate matter
; priority journal
; regression analysis
; seashore
; secondary organic aerosol
; total organic carbon
; United States
; urban area
; California
; Long Beach [California]
; Los Angeles Basin
; 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: To investigate the changing contribution of primary and secondary sources on the oxidative potential of particulate matter (PM) in a real-world urban atmosphere, 7 sets of quasi-ultrafine particles (PM0.25) were collected at three contrasting locations in the Los Angeles Basin, California, USA. Samples were collected in the coastal area of Long Beach during the morning rush hour period, representing fresh primary emissions from nearby freeways and the LA port; in central Los Angeles during midday, representing a mixture of fresh primary emissions and early products of photochemical secondary organic aerosol (SOA) formation; and at a downwind site (Upland) during afternoon, when the impacts of photochemically aged secondary PM are significant. Chemical composition showed distinctive trends, with the lowest fraction of water soluble organic carbon (WSOC) and other organic tracers of SOA formation (e.g. organic acids) at Long Beach, and the lowest abundance of organic tracers of primary vehicular emissions (such as polycyclic aromatic hydrocarbons and hopanes) at Upland. A molecular marker-based chemical mass balance (MM-CMB) model indicated that 72% of the total organic carbon at Long Beach was comprised of primary vehicular sources (combined heavy duty and light duty vehicles), while the vehicular fraction was found to be 50% and 39% at Los Angeles and Upland, respectively. Regression analysis suggested that at Long Beach, the variation in oxidative potential of PM0.25 (quantified using a macrophage-based reactive oxygen species (ROS) assay) was mainly driven by mobile vehicular emissions and the water-insoluble fraction of the organic carbon. In contrast, at Upland, where photochemical processing and secondary aerosol formation was the highest, WSOC and secondary organics were the major drivers of the oxidative potential variation. The multivariate regression analysis also indicated that as much as 58% of the overall spatial and temporal variation in the oxidative potential of PM0.25 at these three locations can be explained by mobile emissions and SOA. © 2015 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/81509
Appears in Collections: 气候变化事实与影响
There are no files associated with this item.
作者单位: University of Southern California, Department of Civil and Environmental Engineering, Los Angeles, CA, United States; University of Wisconsin-Madison, Environmental Chemistry and Technology Program, Madison, WI, United States
Recommended Citation:
Saffari A,, Hasheminassab S,, Wang D,et al. Impact of primary and secondary organic sources on the oxidative potential of quasi-ultrafine particles (PM0.25) at three contrasting locations in the Los Angeles Basin[J]. Atmospheric Environment,2015-01-01,120