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Title: Aerosol size distributions and their temporal variations in relation to urban activity
Authors: Raj, P Ernest
Maheskumar, R S
Devara, P C S
Sonbawne, S M
Saha, S K
Dani, K K
Issue Date: Jun-2002
Publisher: NISCAIR-CSIR, India
Abstract: Multiwavelength columnar aerosol optical depth measurements have been made at a few traffic junctions in the city of Pune, India, to examine the nature of aerosol size distributions close to urban activity. Aerosol loading inferred from Angstrom turbidity coefficient (β) showed that it is highest at site 5 and is least at site 1. Wavelength exponent (α) showed that the above two sites have larger sized particles in the atmosphere than those at sites 2, 3 and 4 which are in the core of the urban area. Daytime temporal variations in both α and β broadly followed those in traffic activity. Aerosol size distributions retrieved by inversion technique were predominantly (60%) single mode or two-slope type. Bimodal type size distributions were also observed at the traffic junctions on about 25% of the time. Time evolution of aerosol size distribution at the traffic junctions varied from day to day and also showed the influence of urban activity.
Page(s): 140-150
ISSN: 0975-105X (Online); 0367-8393 (Print)
Appears in Collections:IJRSP Vol.31(3) [June 2002]

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