Underwater light field and spectral distribution of attenuation depth in inland and coastal waters

The daily variations in the underwater irradiance spectra at different depths were determined using a combination of in situ dataand model calculations. The spectra of the attenuation depth (relevant in optical remote sensing) were derived from thesedata. The results are presented for four Estonian lakes (Koorküla Valgjärv, Võrtsjärv, Harku, and Peipsi) and for coastalwaters of the Baltic Sea (Pärnu Bay, Gulf of Riga)