DOI: 10.1016/j.atmosenv.2019.117137
论文题名: Long-term variability, source apportionment and spectral properties of black carbon at an urban background site in Athens, Greece
作者: Liakakou E. ; Stavroulas I. ; Kaskaoutis D.G. ; Grivas G. ; Paraskevopoulou D. ; Dumka U.C. ; Tsagkaraki M. ; Bougiatioti A. ; Oikonomou K. ; Sciare J. ; Gerasopoulos E. ; Mihalopoulos N.
刊名: Atmospheric Environment
ISSN: 1352-2310
出版年: 2020
卷: 222 语种: 英语
英文关键词: Carbon
; Combustion
; Fossil fuels
; Mixing
; Urban growth
; Athens
; Biomass-burning
; Black carbon
; Mixing layers
; Source apportionment
; Wood burning
; Particulate emissions
; ammonia
; black carbon
; chloride
; fossil fuel
; levoglucosan
; nitrate
; sulfate
; background level
; biomass burning
; black carbon
; long-term change
; mixed layer
; seasonality
; source apportionment
; spectral analysis
; tracer
; urban area
; absorption
; aerosol
; atmosphere
; biomass
; circadian rhythm
; combustion
; dilution
; Greece
; humidity
; meteorology
; particulate matter
; precipitation
; priority journal
; seasonal variation
; summer
; temperature
; urban area
; wind speed
; winter
; wood
; Athens [Attica]
; Attica
; Greece
学科: Athens
; Biomass burning tracers
; Black carbon
; Mixing layer
; Source apportionment
; Wood burning
中文摘要: This study aims to delineate the characteristics of Black Carbon (BC) in the atmosphere over Athens, Greece, using 4-year (May 2015–April 2019) Aethalometer (AE-33) measurements. The average BC concentration is 1.9 ± 2.5 μg m−3 (ranging from 0.1 to 32.7 μg m−3; hourly values), with a well-defined seasonality from 1.3 ± 1.1 μg m−3 in summer to 3.0 ± 4.0 μg m−3 in winter. Pronounced morning and evening/night peaks are found in the BC concentrations in winter, while during the rest of the seasons, this diurnal cycle appears to flatten out, with the exception of the morning traffic peak. On an annual basis, the biomass-burning fraction (BB%) of BC accounts for 22 ± 12%, while the fossil-fuel combustion (BCff) component (traffic emissions and domestic heating) dominates during summer (83%) and in the morning hours. BCwb exhibits higher contribution in winter (32%), especially during the night hours (39%). BC levels are effectively reduced by precipitation, while they significantly build-up for wind speeds <3 m s−1 and mixing-layer height (MLH) < 500 m. Normalizing the BC diurnal course by the MLH variations on a seasonal basis reveals that the residential wood-burning emissions are mostly responsible for the large BC increase during winter nights, whereas the low BC levels during daytime in the warm season are mainly attributed to dilution into a deeper MLH. BCwb is highly correlated with other BB tracers during winter nights (e.g. levoglucosan, non-sea-salt-K+, m/z 60 fragment), as well as with the fine fraction (PM2.5) OC and EC. The Delta-C, which represents the spectral dependence of BC as the absorption difference between 370 and 880 nm, is analyzed for the first time in Athens. It exhibits a pronounced seasonality with maximum values in winter night-time, and it appears as a valid qualitative marker for wood combustion. © 2019 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/161092
Appears in Collections: 气候变化与战略
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作者单位: Institute for Environmental Research and Sustainable Development, National Observatory of Athens, Palaia Penteli, Athens, 15236, Greece; Aryabhatta Research Institute of Observational Sciences (ARIES), Nainital, 263 001, India; Environmental Chemical Processes Laboratory, Department of Chemistry, University of Crete, Crete, 71003, Greece; Energy Environment and Water Research Center, The Cyprus Institute, Nicosi, 2121, Cyprus
Recommended Citation:
Liakakou E.,Stavroulas I.,Kaskaoutis D.G.,et al. Long-term variability, source apportionment and spectral properties of black carbon at an urban background site in Athens, Greece[J]. Atmospheric Environment,2020-01-01,222