Synoptic analysis of chlorophyll_a, suspended sediment and coloured dissolved organic matter during non-monsoon period in Mandovi Zuari estuarine system of Goa, India, through 1RS P4 Ocean Colour Monitor

Abstract

Simultaneous acquisition of water samples, radiance and irradiance measurements were carried out from 40 stations in the Mandovi Zuari estuarine system during February to May 2002. From the samples collected, both inherent and apparent optical properties (IOP and AOP) such as absorption coefficient "a", upwelling diffuse attenuation coefficient "k sub(u)" and subsurface reflectance "R" were derived. Using these optical properties, radiative transfer at each water column was examined. On the basis of the radiative transfer outcome, band-ratio algorithms were derived for three optically active substances (OAS), chlorophyll_a, suspended sediment and coloured dissolved organic matter (CDOM). For chlorophyll_a the band-ratio algorithm is 670/555 nm, sediment it is 490/670 nm while for CDOM it is 412/670 nm. These algorithms were applied to Ocean Colour Monitor (OCM), flown on Indian Remote Sensing Satellite (IRS) Polar Satellite Launch Vehicle (P4), scenes (digital data), to synoptically analyze the constituents.