DOI: 10.1016/j.atmosres.2017.10.004
Scopus记录号: 2-s2.0-85037738156
论文题名: Seasonal variability of carbonaceous aerosols in an urban background area in Southern Italy
作者: Cesari D. ; Merico E. ; Dinoi A. ; Marinoni A. ; Bonasoni P. ; Contini D.
刊名: Atmospheric Research
ISSN: 1698095
出版年: 2018
卷: 200 起始页码: 97
结束页码: 108
语种: 英语
英文关键词: EC
; Equivalent black carbon
; OC
; Seasonal trends
; Secondary organic aerosol
Scopus关键词: Aerosols
; Atmospheric aerosols
; Atmospheric thermodynamics
; Boundary layer flow
; Boundary layers
; Organic carbon
; Particulate emissions
; Roads and streets
; Atmospheric aerosol particles
; Black carbon
; Elemental and organic carbons
; Global atmosphere watches
; Planetary boundary layers
; Seasonal trends
; Secondary organic aerosols
; Secondary organic carbons (SOC)
; Particles (particulate matter)
; aerosol
; black carbon
; concentration (composition)
; diurnal variation
; elemental carbon
; organic carbon
; particulate matter
; seasonal variation
; traffic emission
; trend analysis
; urban atmosphere
; Italy
英文摘要: Organic (OC) and Elemental Carbon (EC) are important components of atmospheric aerosol particles, playing a key role in climate system and potentially affecting human health. There is a lack of data reported for Southern Italy and this work aims to fill this gap, focusing the attention on the long-term trends of OC and EC concentrations in PM2.5 and PM10, and on atmospheric processes and sources influencing seasonal variability. Measurements were taken at the Environmental-Climate Observatory of Lecce (SE Italy, 40°20′8″N-18°07′28″E, 37 m a.s.l.), regional station of the Global Atmosphere Watch program (GAW-WMO). Daily PM10 and PM2.5 samples were collected between July 2013 and July 2016. In addition, starting in December 2014, simultaneous equivalent Black Carbon (eBC) concentrations in PM10 were measured using a Multi Angle Absorption Photometer. A subset of 722 PM samples (361 for each size fraction) was analysed by using a thermo-optical method with a Sunset Laboratory OC/EC analyser, to determine elemental and organic carbon concentrations. The average PM10 and PM2.5 concentrations were 28.8 μg/m3 and 17.5 μg/m3. The average OC and EC concentrations in PM10 were 5.4 μg/m3 and 0.8 μg/m3, in PM2.5 these were 4.7 μg/m3 and 0.6 μg/m3. Carbonaceous content was larger during cold season with respect to warm season as well as secondary organic carbon (SOC) that was evaluated using the OC/EC minimum ratio method. SOC was mainly segregated in PM2.5 and represented 53% - 75% of the total OC. A subset of EC data was compared with eBC measurements, showing a good correlation (R2 = 0.80), however, eBC concentrations were higher than EC concentrations of an average factor of 1.95 (+/− 0.55 standard deviation). This could be explained by the presence of a contribution of Brown Carbon (BrC), for example from biomass burning, in eBC measurements. Weekly patterns showed a slight decrease of carbon content during weekends with respect to weekdays especially visible on eBC concentration due to the decrease of road traffic emissions. The daily patterns of hourly eBC concentrations showed a decrease in central diurnal hours, due to the cycle of planetary boundary-layer height, and concentrations peaks during rush hours due to road traffic emissions. © 2017 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/109008
Appears in Collections: 影响、适应和脆弱性 气候变化事实与影响
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作者单位: Istituto di Scienze dell'Atmosfera e del Clima, ISAC-CNR, S.P. Lecce-Monteroni km 1.2, Lecce, 73100, Italy; Istituto di Scienze dell'Atmosfera e del Clima, ISAC-CNR, Bologna, 40129, Italy
Recommended Citation:
Cesari D.,Merico E.,Dinoi A.,et al. Seasonal variability of carbonaceous aerosols in an urban background area in Southern Italy[J]. Atmospheric Research,2018-01-01,200