Abstract
Concurrent observations of aerosol optical depth (AOD) were carriedout using a high-spectral-resolution radiometer (HSRR) and solar radiometer(SR) at the Indian Institute of Tropical Meteorology (IITM), Pune, India, onall clear-sky days available during November 1995-February 1996. The HSRRobservations were collected at 5 nm intervals throughout the 400-700 nmspectrum while the SR measurements were made at discrete wavelengths of 400,600, 940, 1060 and 1630 nm. In order to study the effect of integratedspectral observations on the derived AODs as compared to such depths from asingle spectrum, multi-spectral observations at 2 nm intervals were collected.The AODs and their wavelength dependence from the HSRR and SR are compared andfairly good agreement found. The HSRR derived AODs at 400 nm and 700 nm fromthe present data sets are compared with those obtained during the winters of1993-94 and 1994-95. The results reveal greater AODs, indicating abundanceof aerosol particle concentration, during 1995-96 as compared to 1993-94 and1994-95.
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