globalchange  > 气候变化与战略
DOI: 10.1016/j.atmosenv.2019.117088
论文题名:
Day-of-week patterns for ultrafine particulate matter components at four sites in California
作者: Xue W.; Xue J.; Shirmohammadi F.; Sioutas C.; Lolinco A.; Hasson A.; Kleeman M.J.
刊名: Atmospheric Environment
ISSN: 1352-2310
出版年: 2020
卷: 222
语种: 英语
英文关键词: Combustion ; Diesel engines ; Location ; Organic carbon ; Trace elements ; Biomass combustion ; Concentration profiles ; Elemental carbon ; Population exposure ; Sampling location ; Thermal-optical carbon analyzer ; Ultra-fine particulate matters ; Ultrafine particle ; Particles (particulate matter) ; carbon ; organic carbon ; potassium ; rubidium ; trace element ; annual cycle ; biomass ; combustion ; concentration (composition) ; elemental carbon ; organic carbon ; particulate matter ; pollutant source ; air pollution ; air quality ; air sampling ; biomass ; California ; chemical composition ; circannual rhythm ; combustion ; concentration (parameter) ; diesel engine ; inductively coupled plasma mass spectrometry ; particulate matter ; population exposure ; priority journal ; seasonal variation ; California ; United States
中文摘要: Ultrafine particulate matter (PM0.1) samples were collected during three-day averaging periods over an annual cycle at four sites across California: Los Angeles, East Oakland, San Pablo, and Fresno. PM0.1 samples were analyzed for thermal carbon fractions using a thermal-optical carbon analyzer and trace elements using ICP-MS. A statistical analysis of the day-of-week trends for 15 PM0.1 components reveals location-specific patterns along with important general trends for UFP concentrations. PM0.1 elemental carbon (EC) concentrations are elevated in the middle of the week consistent with increased activity for diesel engines during this time period. Just as significantly, PM0.1 organic carbon (OC) concentrations do not exhibit a day-of-week pattern. Since OC accounts for the majority of the PM0.1 total mass, the lack of a day-of-week pattern for PM0.1 OC suggests that diesel engines do not dominate total PM0.1 mass in California. A paired t-test constructed using measurements on weekends compared to measurements immediately preceding or immediately following the weekend showed that PM0.1 potassium (K) and rubidium (Rb) concentrations were elevated on weekends. This pattern is consistent with increased biomass combustion on weekends (a previously unknown exposure pattern for UFPs). The two closest sampling locations (East Oakland and San Pablo) had the greatest number of UFP components with identical weekly trends, but even at these locations only 4 out of 15 components displayed the exact same day-of-week profiles. Less similarity was observed in measured day-of-week profiles for UFP components at other sites. The heterogeneity between sites suggests that the details of UFP concentrations at each location reflect the mixture of sources immediately adjacent to that site. By extension, individual neighborhoods across California will each experience unique day-of-week concentration profiles for UFP components that reflect the surrounding sources. These factors must be considered when estimating population exposure to ultrafine particles during future health effects studies. © 2019 Elsevier Ltd
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/160640
Appears in Collections:气候变化与战略

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作者单位: Department of Civil and Environmental Engineering, University of California – Davis, Davis, CA, United States; Department of Civil and Environmental Engineering, University of Southern California, Los Angeles, CA, United States; Department of Chemistry, California State University – Fresno, Fresno, CA, United States

Recommended Citation:
Xue W.,Xue J.,Shirmohammadi F.,et al. Day-of-week patterns for ultrafine particulate matter components at four sites in California[J]. Atmospheric Environment,2020-01-01,222
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