The assessment of apparent optical properties of Chlorophll-a in Kuala Terengganu coastal waters

Abstract

This study was concentrated on turbid and semi turbid multicomponental coastal waters. The component of Apparent Optical Properties(AOP) were determined during the field sampling in Kuala Terengganu coastal water. The relationship between Remote Sensing Reflectance (RrJ and Diffuse Attenuation Coefficient(KJ with the concentration of Chlorophyll-a was succesfully studied. The peak wavelength to best detect the Chlorophyll-a concentration from station 1-22 was 509nm and 532nm. Furthermore, the highest value of R2 that is 0.649 showed that there was correlation between the Rrs component and the concentration of Chlorophyll-a at 509nm wavelength compared to other wavelength. While for the other component, K<1, the visible region (443,490, 510, 532, 555, and 647nm) showed a significant correlation with the concentration of Chlorophyll-a with R2 more than 0.9. The deepest the water, the much lesser the value of Rrs· This is because of the rate of the sunlight penetration into the ocean water decreased with the increasing of the ocean depth. Thus, the total amount of sunlight that will be reflected back by the ocean particle and the water itself will be much lesser.