DOI: 10.1016/j.atmosenv.2015.03.002
Scopus记录号: 2-s2.0-84924401786
论文题名: Impact of lake breezes on ozone and nitrogen oxides in the Greater Toronto Area
作者: Wentworth G ; R ; , Murphy J ; G ; , Sills D ; M ; L
刊名: Atmospheric Environment
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2015
卷: 109 起始页码: 52
结束页码: 60
语种: 英语
英文关键词: Greater Toronto Area
; Lake breeze
; Nitrogen oxides
; Ozone
Scopus关键词: Air quality
; Nitrogen
; Nitrogen oxides
; Ozone
; Ambient air quality
; Breeze circulation
; Greater Toronto Area
; Meteorological observation
; Mixing ratios
; Multi-platform
; Pollutant levels
; SIMPLE algorithm
; Lakes
; nitrogen oxide
; oxygen
; ozone
; air quality
; algorithm
; atmospheric pollution
; data set
; mixing ratio
; nitrogen oxides
; ozone
; air pollutant
; air quality
; algorithm
; Article
; cloud
; concentration (parameters)
; environmental temperature
; lake
; lake breeze
; meteorology
; methodology
; priority journal
; seasonal variation
; summer
; wind
; 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: Meteorological and air quality datasets from summertime (May to September, 2010-2012) were analysed in order to assess the influence of lake-breeze circulations on pollutant levels in the Greater Toronto Area (GTA). While previous estimates of the frequency of summer days experiencing lake breezes range between 25 and 32 % for the GTA, a simple algorithm using surface meteorological observations suggested Lake Ontario breezes occurred on 56% of summer days, whereas a more reliable multiplatform approach yielded a frequency of 74%. Data from five air quality stations across the GTA were used to compare air quality on days during which a lake-breeze circulation formed ("lake breeze days") versus days when one did not ("non-lake breeze days"). Average daytime O3 maxima were 13.6-14.8ppb higher on lake breeze days relative to non-lake breeze days. Furthermore, the Ontario Ambient Air Quality Criteria (AAQC) for 1-haverage O3 (80ppb) and 8-haverage O3 (65ppb) were exceeded only on lake breeze days and occurred on a total of 30 and 54 days throughout the study period, respectively. A causal link between lake-breeze circulations and enhanced O3 was identified by examining several days in which only some of the air quality sites were inside the lake-breeze circulation. O3 mixing ratios at sites located within the circulation were at least 30ppb higher than sites outside the circulation, despite similar temperatures, cloud conditions and synoptic regimes across the region. Rapid O3 increases were concurrent with the arrival of the lake-breeze front, suggesting O3-rich air from over the lake is being advected inland throughout the day. Lake-breeze circulations were found to have less impact on nitrogen oxide (NOx) levels. Morning NOx was greater on lake breeze days, probably due to the stagnant conditions favourable for lake breeze formation. During the late afternoon, only inland sites experience increased NOx on lake breeze days, likely as a result of being downwind from near-shore city centres. © 2015 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/81828
Appears in Collections: 气候变化事实与影响
There are no files associated with this item.
作者单位: Department of Chemistry, University of Toronto, 80 St. George Street, Toronto, Canada; Cloud Physics and Severe Weather Research Section, Environment Canada, 4905 Dufferin Street, Toronto, Canada
Recommended Citation:
Wentworth G,R,, Murphy J,et al. Impact of lake breezes on ozone and nitrogen oxides in the Greater Toronto Area[J]. Atmospheric Environment,2015-01-01,109