Abstract
Objectives: To find characteristics of Aerosol optical depth (AOD) at ultraviolet (340-380 nm), visible (440-675 nm) and near-infrared (870-1020 nm) wavelength spectrum. During estimation of the radiative effect of aerosol in the atmosphere of earth radiation budget, it is important to study AOD. It is the total disappearance of sun rays due to aerosols in atmospheric column by absorption and scattering. Methodology: AOD is being measured using ground based sensor called CIMEL Sun photometer over Kanpur as it is situated in the Indo-Gangetic Basin. Findings: The seasonal variations in AOD as well as in various months of the year at 340nm, 500nm and 1020nm under all clear days have been studied. The observations showed that AOD was increasing from Pre-monsoon to Post-monsoon season at short wavelengths; whereas it was found to be decreasing at longer wavelengths regions. Novelty: Area under study is surrounded by small to large scale industries. Therefore, industrial emission is a major source of anthropogenic aerosols. The study of spectral and seasonal variations of Aerosol Optical Depth is important because the accumulation of aerosol particularly mixing state of aerosols has impact on atmospheric dynamics. Furthermore this work will also motivate the researchers to develop aerosol climatology map particularly for Indian regions. Keywords: Aerosol optical depth (AOD); CIMEL sun photometer; solar radiations
Highlights
The small sized particles drifting between surface of earth and stratosphere are called Atmospheric aerosols[1]
This work will motivate the researchers to develop aerosol climatology map for Indian regions and to monitor aerosols in different geographical regions This paper aims to find the characteristics of Aerosol optical depth (AOD) at ultra-violet (340380 nm), visible (440-675 nm) and near-infrared (870-1020 nm) wavelength spectrum using ground based sensor called CIMEL sun photometer over Kanpur as it is located in the Indo-Gangetic Basin (IGB)
CIMEL sun photometer is an automatic instrument which runs without any operator assistance
Summary
The small sized particles drifting between surface of earth and stratosphere (in solid, liquid or gaseous phase) are called Atmospheric aerosols[1]. These particles are created in the atmosphere or transported to the atmosphere by various sources.[2,3,4] These aerosols may be primary or secondary. The process of coagulation happens due to the collision among these particles This process often increases the concentration of lager particles and simultaneously decreases the smaller particles. During their lifecycle, particles are appeared to be changed by such processes
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