摘要：The daily variations in the underwater irradiance spectra at different depths were determined using a combination of in situ data and model calculations. The spectra of the attenuation depth (relevant in optical remote sensing) were derived from these data. The results are presented for four Estonian lakes (Koork¨ula Valgj¨arv,V˜ortsj¨arv, Harku, and Peipsi) and for coastal waters of the Baltic Sea (P¨arnu Bay, Gulf of Riga).
