Aerosols are short-lived with a residual time of about a week in the lower atmosphere and are concentrated around the
source of origin. Aerosols are produced by variety of natural processes as well as by anthropogenic activities; it gets
distributed in the atmosphere through turbulent mixing as well as transported away from the source of origin and thus
results in its large seasonal and spatial variability. In this study, the CIMEL sun-photometer measurements at Kavaratti
calibration and validation site are used to characterize the aerosols’ nature at the measurement site. Also, these in-situ
measurements are used to validate the satellite sensor derived aerosol optical depth (AOD) parameter. The data analysis
shows that the locally generated aerosols are mostly of marine aerosols and other natural aerosols are transported desert
dust. The anthropogenic aerosols are transported from mainland and they are found during the pre-monsoon season. Also
aerosol measurements for five years (2009 – 2015) are being planned for validating the satellite sensors derived AOD
products namely: OceanSat2-OCM2, MODIS-Terra and MODIS-Aqua.
Spaceborne radar scatterometers operating in microwave frequency bands have several science and operational applications in Oceanography, meteorology, agricultural and geophysical sciences. The basic parameter measured by a scatterometer is the Backscattering coefficient (&psigma;^0) for a certain frequency, polarization and observational geometry. Before addressing a specific application, it is needed that the &psigma;^0 signatures be analyzed over natural, undisturbed and uniform/quasi-uniform target areas. As a prelude to ISRO's forthcoming OceanSat-II mission, carrying a Ku-band scatterometer, QuikSCAT scatterometer measured &psigma;^0 data are analyzed over its dynamical range using the global natural targets.