气候变化领域集成服务门户(CCPortal): Optical and microphysical properties of the columnar Aerosol burden over the Eastern Mediterranean: Discrimination of Aerosol types

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DOI	10.1016/j.atmosenv.2020.117463
	Optical and microphysical properties of the columnar Aerosol burden over the Eastern Mediterranean: Discrimination of Aerosol types
	Tutsak E.; Koçak M.
发表日期	2020
ISSN	1352-2310
卷号	229
英文摘要	Optical and microphysical properties, for example, refractive index, single scattering albedo (SSA) and asymmetry factor were attained from AERONET ground based sun sky radiometer situated at rural coastal Erdemli in the Eastern Mediterranean between 2000 and 2014. On average, imaginary part of the refractive index (REFI ~ 0.007) and SSA (~0.93) denoted that the aerosol composition was similar to that of Industrial/Urban aerosol type. However, the daily variation in optical and microphysical properties was greatly influenced by diverse aerosol types. REFI for relatively clean dust events decreased from ~0.010 at 440 nm to 0.002 at 1020 nm whereas corresponding SSA increased from ~0.80 at 440 nm to ~0.96 at 1020 nm. Comparatively, lower REFI and higher SSA values were observed when the dust particles mixed with secondary aerosols might be due to shielding of iron oxides by sulfate and nitrate particles. On the contrary, larger REFI (up to 0.044 at 440 nm) and lower SSA (down to 0.72 at 440 nm) values were found for dust mixed with smoke particles likely because of lensing effect. REFI for spring reduced from 0.065 at 440 nm to 0.038 at 1020 nm with SSA rising from 0.92 to 0.95 owing to frequent dust episodes take place in this period. Although, summer and fall exhibited similar wavelength dependence of REFI and SSA, the former denoted more absorbing character compared to the latter. This difference might be ascribed to anthropogenic aerosol composition, such as black carbon and secondary aerosol, with diverging contributions. Hierarchical cluster analyses revealed six classes namely, dust, dust mixed with smoke particles, smoke, smoke with secondary, secondary with smoke and secondary aerosol type. Relative contributions from hierarchical cluster analyses and angstrom exponent classification yielded coherent results, dust and anthropic being around 20% and 80%, respectively. Whereas, k-means exhibited overestimation and underestimation for dust (35%) and anthropogenic (65%) aerosol type, respectively. The hierarchical cluster analysis was more powerful tool to classify aerosol type than k-means, thus the application of the k-means should be performed with an utmost care. © 2020 Elsevier Ltd
关键词	Aerosol optical and microphysical properties Aerosol types Cluster analyses Eastern Mediterranean Seasonal aerosol variability
语种	英语
scopus关键词	Dust; Hierarchical clustering; Hierarchical systems; Iron oxides; K-means clustering; Refractive index; Smoke; Sulfur compounds; Aerosol composition; Anthropogenic aerosols; Eastern Mediterranean; Microphysical property; Relative contribution; Single scattering albedo; Sun-sky radiometers; Wavelength dependence; Aerosols; black carbon; iron oxide; AERONET; aerosol; aerosol composition; black carbon; cluster analysis; diurnal variation; optical property; radiometer; refractive index; smoke; spatiotemporal analysis; aerosol; Article; chemical composition; coastal plain; hierarchical clustering; Mediterranean Sea; optics; physical phenomena; priority journal; refraction index; rural area; smoke; Erdemli; Mediterranean Sea; Mediterranean Sea (East); Mersin [Turkey]; Turkey
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/249200
作者单位	Institute of Marine Sciences, Middle East Technical University, P.O. Box 28, Erdemli-Mersin33731, Turkey
推荐引用方式 GB/T 7714	Tutsak E.,Koçak M.. Optical and microphysical properties of the columnar Aerosol burden over the Eastern Mediterranean: Discrimination of Aerosol types[J],2020,229.
APA	Tutsak E.,&Koçak M..(2020).Optical and microphysical properties of the columnar Aerosol burden over the Eastern Mediterranean: Discrimination of Aerosol types.ATMOSPHERIC ENVIRONMENT,229.
MLA	Tutsak E.,et al."Optical and microphysical properties of the columnar Aerosol burden over the Eastern Mediterranean: Discrimination of Aerosol types".ATMOSPHERIC ENVIRONMENT 229(2020).