DOI: 10.1016/j.atmosenv.2014.10.006
Scopus记录号: 2-s2.0-84907990480
论文题名: Variability of atmospheric ammonia related to potential emission sources in downtown Toronto, Canada
作者: Hu Q ; , Zhang L ; , Evans G ; J ; , Yao X
刊名: Atmospheric Environment
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2014
卷: 99 起始页码: 365
结束页码: 373
语种: 英语
英文关键词: NH3
; PNH4+
; Seasonal variations
; Soil emission
; Temperature effect
Scopus关键词: Atmospheric ammonia
; Emission sources
; NH<sub>3</sub>
; PNH<sub>4</sub> <sup>+</sup>
; Seasonal variation
; Toronto , Canada
; Thermal effects
; ammonia
; water
; agricultural emission
; ammonia
; atmospheric chemistry
; biogenic emission
; greenspace
; particulate matter
; pollutant source
; seasonal variation
; soil emission
; street canyon
; temperature effect
; air monitoring
; air pollution
; Article
; atmospheric dispersion
; Canada
; circadian rhythm
; fluid intake
; limit of detection
; particulate matter
; seasonal variation
; summer
; traffic
; winter
; Canada
; Ontario [Canada]
; Toronto
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 variability of atmospheric ammonia (NH3) in downtown Toronto was investigated through the analysis of 24hr integrated denuder NH3 samples collected at a site above a street canyon every third day from July 2003 to September 2011 (Dataset 1). The measured NH3 mixing ratios ranged from below the detection limit to 14.7ppb during the eight-year period. Distinctive seasonal variations were observed with summer averages (±standard deviation) of 3.9±1.6ppb and winter averages of 1.1±0.6ppb. Two other datasets, weekly/biweekly passive samples of NH3 monitored at 74 agricultural and remote sites across southern Ontario during the period of June 2006 to March 2007 (Dataset 2) and semi-continuous measurements of NH3 and ammonium (pNH4+) in PM2.5 collected at a site inside a street canyon approximately 170m away from the downtown site in December 2008 and February, March and May 2009 (Dataset 3), were further used to evaluate the potential NH3 sources in downtown Toronto. The NH3 mixing ratios at the downtown location were higher than those at the surrounding agricultural sites, and the mixing ratios within the street canyon were almost double those measured above it. These results suggested that the observed NH3 at the downtown location was mainly from local sources within the street canyon. Analysis of Dataset 3 showed that the diurnal cycles of NH3 at the downtown location cannot be simply explained by traffic and water consumption patterns. A green space inside the street canyon was identified as a potential important source contributing to the observed NH3 when T>0°C. However, the major NH3 emission sources at T≤0°C are yet to be investigated. © 2014 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/80546
Appears in Collections: 气候变化事实与影响
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作者单位: Key Lab of Marine Environmental Science and Ecology, Ministry of Education, Ocean University of China, Qingdao, China; Air Quality Research Division, Science and Technology Branch, Environment Canada, 4905 Dufferin Street, Toronto, ON, Canada; Southern Ontario Centre for Atmospheric Aerosol Research, University of Toronto, Toronto, ON, Canada
Recommended Citation:
Hu Q,, Zhang L,, Evans G,et al. Variability of atmospheric ammonia related to potential emission sources in downtown Toronto, Canada[J]. Atmospheric Environment,2014-01-01,99