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Euphotic zone depth (Z_eu) is a key indicator of underwater light environment that regulates different biogeochemical and physical processes in aquatic ecosystem. Remote sensing approaches offer a unique opportunity to frequently monitor Z_eu, although its estimation from diffuse attenuation coefficient (K_d) requires depth profiles of the down-welling irradiance (E_d). Measuring E_d values at different water depths (i.e., E_d profiling) in shallow waterbodies is a challenging task with the available profiling equipment. In this study, K_d values were estimated from measured absorption coefficient (a) data at multiple locations in the Chilika lagoon, which is a shallow waterbody located in the eastern coast of India and is a prestigious Ramsar site. Specifically, remote sensing reflectance (R_rs), a values (wavelength: 400–715 nm at 4 nm interval), Secchi disc depth (Z_SD), suspended particulate matter (SPM) and chlorophyll …