Measurements of submarine light were undertaken in the Hardangerfjord (West Norway) in the summers of 1955 and 1956. Discharge of very turbid water from glacier-fed rivers during their summer floods produces very low transparency in some of the fjord branches. From the inner to the outer part of the fjord a gradual increase in transparency takes place. A pronounced difference in the spectral composition of the submarine light of the very turbid inner waters and of the ordinary coastal waters at the mouth was recorded. For glacier-fed rivers with sedimentation basins Tyndall readings demonstrated a great reduction in turbidity during the passage through the lakes.
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