globalchange  > 气候变化事实与影响
DOI: 10.1016/j.atmosenv.2014.09.044
Scopus记录号: 2-s2.0-84907856335
论文题名:
Changes in fine particulate matter measurement methods and ambient concentrations in California
作者: Tao L; , Harley R; A
刊名: Atmospheric Environment
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2014
卷: 98
起始页码: 676
结束页码: 684
语种: 英语
英文关键词: Dichotomous sampler ; Federal equivalent method (FEM) ; Federal reference method (FRM) ; Fine particles
Scopus关键词: Ambient concentrations ; California ; Dichotomous sampler ; Federal equivalent methods ; Federal reference methods ; Fine particles ; Fine particulate matter ; Measurement methods ; ambient air ; burning ; concentration (composition) ; measurement method ; particulate matter ; temporal variation ; air filter ; air monitor ; air monitoring ; air pollution ; ambient air ; Article ; atmospheric deposition ; beta attenuation monitor ; controlled study ; measurement ; molecular weight ; particulate matter ; reduction ; regression analysis ; seasonal variation ; summer ; temporal analysis ; trend study ; United States ; winter ; wood ash ; wood burning ; California ; Los Angeles [California] ; Oakland ; San Francisco Bay ; San Joaquin Valley ; 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: The fine particle (PM2.5) air pollution monitoring network in California underwent major changes between 1988 and 2013, adding continuous beta attenuation monitors (BAM) to the network. This paper analyzes temporal patterns using PM2.5 mass measurements from three major air basins. Regressions of BAM against filter measurements generally show BAM reads higher by 3-6μg/m3 for annual averages. Most monitoring sites show clear downward trends in PM2.5 concentrations over time, especially in the Los Angeles area where concentrations have decreased by more than 50% since the 1990s. In most cases, PM2.5 concentrations are elevated in winter compared to summer, with basin-wide average increases of 80±25% for the San Francisco Bay area and 123±28% for the San Joaquin Valley. The differences are more prominent at night due to wood-burning and stagnant atmospheric conditions. The reverse is true at inland sites in southern California, which show average reductions of 46±12% in winter. Weekend concentrations are slightly lower than on weekdays. Average weekend reductions in PM2.5 relative to mid-week values are 8.9±5.9% for the San Francisco Bay area and 8.0±3.0% for the San Joaquin Valley. Up to 25% reductions in PM2.5 are observed on weekends at traffic-dominated sites such as West Oakland. © 2014 Elsevier Ltd.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/80533
Appears in Collections:气候变化事实与影响

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作者单位: Department of Civil and Environmental Engineering, University of California Berkeley, Berkeley, CA, United States

Recommended Citation:
Tao L,, Harley R,A. Changes in fine particulate matter measurement methods and ambient concentrations in California[J]. Atmospheric Environment,2014-01-01,98
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