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Use of a compact, low power commercial lidar onboard a small aircraft foraerosol studies is demonstrated. A Micro Pulse Lidar fitted upside down in aBeech Superking aircraft is used to measure the vertical distribution ofaerosols in and around Hyderabad, an urban location in the central India.Two sorties were made, one on 17 February 2004 evening hours and the otheron 18 February 2004 morning hours for a total flight duration of fourhours. Three different algorithms, proposed by Klett (1985), Stephens et al. (2001)and Palm et al. (2002) for deriving the aerosol extinction coefficientprofile from lidar data are studied and is shown that the results obtainedfrom the three methods compare within 2%. The result obtained from theairborne lidar is shown more useful to study the aerosol distribution in thefree troposphere than that obtained by using the same lidar from ground.Using standard radiative transfer model the aerosol radiative forcing iscalculated and is shown that knowledge on the vertical distribution ofaerosols is very important to get more realistic values than using modelvertical profiles of aerosols. We show that for the same aerosol opticaldepth, single scattering albedo and asymmetry parameter but for differentvertical profiles of aerosol extinction the computed forcing values differwith increasing altitude and improper selection of the vertical profile caneven flip the sign of the forcing at tropopause level

annales geophysicae

Airborne lidar study of the vertical distribution of aerosols over Hyderabad, an urban site in central India, and its implication for radiative forcing calculations