Goel, Vikas and Mishra, Sumit Kumar and Lodhi, Neelesh and Singh, Sachchidanand and Ahlawat, Ajit and Gupta, Beena and Das, Rupesh M. and Kotnala, R. K. (2018) Physico-chemical characterization of individual Antarctic particles: Implications to aerosol optics. Atmospheric Environment, 192. pp. 173-181. ISSN 1352-2310

PDF - Published Version Restricted to Registered users only Download (2755Kb) | Request a copy

Abstract

Aerosols affect the Earth's radiation budget by interacting with the incoming solar radiation. The physicochemical properties, particularly morphological parameters (Aspect Ratio, AR and Circulatory Factor, CIR) and composition at individual particle level are important inputs to the optical model for assessing the optical sensitivity towards said properties. The observation of these properties is limited over Antarctica which has been studied in detail in the present work. The PM5 particles (particulate matter with aerodynamic diameter less than 5 mu m) over Antarctica were collected at Indian Antarctic station, Maitri (70.77 degrees S, 11.73 degrees E) from Dec 2013-Feb 2014. The individual particle analysis revealed that particles were mainly composed of Si, Fe, Al, Ca and Mg. Most of the particles were observed in layered, flattened, aggregated and glass-like shapes. The frequency distributions of the morphological parameters, AR and CIR were observed to be bimodal with respective mode peaks 1.3 and 1.9 for AR; 0.4 and 0.7 for CIR. The spectral refractive indices of individual particles were estimated. The imaginary part of the refractive indices was observed to be maximum for chromium (Cr) and iron (Fe) rich particle and nearly negligible for aluminum (Al) rich particle. At 0.58 mu m wavelength, the difference in SSA with respect to Al rich particle was found to be maximum for Ca rich particles (i.e. 43%) followed with Cr and Fe rich particle (i.e. 42.08%) and Cr rich particle (i.e. 39.32%).

Item Type:	Article
Additional Information:	Copyright for this article belongs to M/s Elsevier.
Subjects:	Meteorology & Atmospheric Sciences Environmental Science > Environmental Contamination and Toxicology Environmental Science > Environmental Contamination and Toxicology Environmental Science > Environmental Contamination and Toxicology Environmental Science > Environmental Contamination and Toxicology
Divisions:	UNSPECIFIED
Depositing User:	Mr. Yogesh Joshi
Date Deposited:	27 Mar 2019 11:26
Last Modified:	27 Mar 2019 11:26
URI:	http://npl.csircentral.net/id/eprint/4039

Actions (login required)

View Item