Abstract
A more detailed study and identification of aerosol types can help to better understand the sources and effects of aerosols. In the present study, a number of optical properties of aerosols have been investigated seasonal for discrimination of aerosol types during 2010-2014 over Zanjan, Iran. Also using AERosol RObotic NETwork (AERONET) data, aerosol was classified by multiple clustering techniques. Both fine and coarse modes particles were seen in seasonal averaged of Aerosol Volume Size Distribution (AVSD). Single Scattering Albedo (SSA) variations indicate the presence of scattering aerosol like dust in the spring, summer and fall, and dominance of absorbing type aerosols in the winter. The maximum value of the phase function was observed in the summer and in small scattering angle which can be due to presence of coarse mode dust particles. The scatter plot of Aerosol Optical Depth (AOD) versus Angstrom Exponent (AE) is one of the most effective methods to find aerosol types. Extinction Angstrom exponent (EAE) versus SSA and EAE versus absorption Angstrom exponent (AAE) are other ways to classification of aerosol types. Graphs show abundance of dust in the spring, summer and fall in Zanjan's atmosphere. Also presence of urban/industrial aerosols is in all seasons, especially in the fall and winter. In addition mixed aerosols exist in all seasons. On the other hand, no biomass burning aerosols found in Zanjan's atmosphere.
Highlights
Aerosols are Liquid or solid particles suspended in the air [1]
In the summer and spring the high values of Aerosol Volume Size Distribution (AVSD) could be due to presence of dust particles [16,17,18]
A detailed study on the optical properties of aerosols using AERosol RObotic NETwork (AERONET) data was accomplished over Zanjan, Iran during 2010-2014
Summary
Aerosols are Liquid or solid particles suspended in the air [1]. Human health hazards and air pollution are some of the effects of aerosols, As well as reducing the horizontal visibility [2, 3]. Aerosols classified according to their size, distribution, composition and how they are formed [2, 5]. Coarse mode particles with a radius larger than 0.6 μm, produced by mechanical action of wind [6]. Few researches have been conducted to inquire optical properties of aerosols by means of remote sensing techniques [7,8,9] and radiative effect of aerosols [10] over Iran. First the optical properties such as Aerosol Volume Size Distribution (AVSD), Single Scattering Albedo (SSA) and Phase function, were investigated using AErosol RObotic NETwork (AERONET) data. Different aerosol types were classified using multiple clustering techniques over Zanjan, Iran during 2010-2014. Variation in types of aerosols in the atmosphere of Zanjan has been studied in different seasons
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