Abstract
Multi-spectral observations of solar radiation using a Volz sun-photometer have been carried out during February 24–March 2, 1995 in the vicinity of the blow-out of the gas well at Pasarlapudi, Andhra Pradesh, India. These unique and special observations have been utilized to study the aerosol, Rayleigh molecular and gaseous optical thicknesses. The results of the analysis of the observations indicated, besides low gas concentrations well below their background values, significant variations in aerosol optical thickness (AOT) at visible and near-infrared wavelength regions. The wavelength dependence of AOT revealed wide variations in the Junge aerosol size exponent from 0.98 to 6.70 indicating the presence of both sub-micron and coarse-mode aerosol particles over the observational site. A close correspondence between AOT and surface-level meteorological parameters during the period of observations was also noticed.
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