气候变化领域集成服务门户(CCPortal): In situ identification of aerosol types in Athens, Greece, based on long-term optical and on online chemical characterization

CCPortal

DOI	10.1016/j.atmosenv.2020.118070
	In situ identification of aerosol types in Athens, Greece, based on long-term optical and on online chemical characterization
	Kaskaoutis D.G.; Grivas G.; Stavroulas I.; Liakakou E.; Dumka U.C.; Dimitriou K.; Gerasopoulos E.; Mihalopoulos N.
发表日期	2020
ISSN	13522310
英文摘要	Absorption Ångström Exponent (AAE) and Scattering Ångström Exponent (SAE) values, derived from aethalometer and nephelometer measurements during a period of 3 years at an urban background site in Athens, are combined for the first aerosol type classification using in situ measurements in the eastern Mediterranean. In addition, single scattering albedo (SSA) and its wavelength dependence (dSSA), as well as the chemical composition of fine aerosols and precursor gases from collocated measurements, are utilized to provide further insights on the optical-chemical characterization and related sources of seven identified aerosol types. Urban aerosols are mostly characterized as Black Carbon (BC)-dominated (76.3%), representing a background atmosphere where fossil-fuel combustion is dominant throughout the year, while 14.3% of the cases correspond to the mixed Brown Carbon (BrC)-BC type, with a higher frequency in winter. The BrC type is associated with the highest scattering and absorption coefficients during winter nights, representing the impact from residential wood-burning emissions. Dust mixed with urban pollution (1.2%) and large particles mixed with BC (5.3%) have a higher frequency in spring. Furthermore, aging processes and BC coating with organic and inorganic species with weak spectral absorption (AAE<1) account for 2.2%, with a differentiation between small and large particles. dSSA is recognized as a useful parameter for aerosol characterization, since fine aerosols are associated with negative dSSA values. The identified aerosol types are examined on a seasonal, monthly, hourly basis and by potential source areas, as well as in comparison with fine-aerosol chemical composition and apportioned organic aerosol source contributions, in an attempt to explore the linkage between optical, physical and chemical aerosol properties. Chemical analysis indicates high organic fraction (60–68%) for the BrC and BrC/BC, 20–30% larger compared to other types. The results are essential for parametrization in chemical transport models and for reducing the uncertainty in the assessment of aerosol radiative effects. © 2020 Elsevier Ltd
英文关键词	AAE; Aerosol types; Athens; Chemical composition; Classification; dSSA; SAE; Sources
语种	英语
scopus关键词	Aerosols; Bromine compounds; Carbon; Chemical analysis; Fossil fuels; Particulate emissions; Pollution; Urban growth; Aerosol characterization; Chemical characterization; Chemical compositions; Chemical transport models; Fossil fuel combustion; Residential wood burning; Scattering and absorption; Single scattering albedo; Atmospheric movements
来源期刊	Atmospheric Environment
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/153071
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
推荐引用方式 GB/T 7714	Kaskaoutis D.G.,Grivas G.,Stavroulas I.,et al. In situ identification of aerosol types in Athens, Greece, based on long-term optical and on online chemical characterization[J],2020.
APA	Kaskaoutis D.G..,Grivas G..,Stavroulas I..,Liakakou E..,Dumka U.C..,...&Mihalopoulos N..(2020).In situ identification of aerosol types in Athens, Greece, based on long-term optical and on online chemical characterization.Atmospheric Environment.
MLA	Kaskaoutis D.G.,et al."In situ identification of aerosol types in Athens, Greece, based on long-term optical and on online chemical characterization".Atmospheric Environment (2020).