Description:
Kd490 with a 100-km buffer. Turbidity was considered to be positively related to the diffuse attenuation coefficient of light at the 490 nm wavelength (Kd490), or the rate at which light at 490 nm is attenuated with depth. For example, a Kd490 value of 0.1 m?1 means that light intensity is reduced by one natural-log value within 10 m of water. High values of Kd490, therefore, represent high attenuation and hence high turbidity.