Relationships between the satellite-derived diffuse attenuation coefficient of downwelling irradiance (Kd) and airborne-based vertical attenuation of lidar volume backscattering (a) were examined in two coastal environments. At 1.1 km resolution and a wavelength of 532 run, we found a greater connection between a and Kd when a was computed below 2 m depth (Spearman rank correlation coefficient up to 0.96), and a larger contribution of Kd to a with respect ...