Knowledge of the flux of radiant energy is essential to interpret habitat variability in the water column.
Solar radiation is measured with two automated, independent instruments.
Data are logged over the daylight period. Introduction Measurements of solar radiative flux are essential to interpret variability in primary production. In addition, the depth distribution of underwater light is an important physical determinant of phytoplankton standing stock and species composition. Our measurements of radiation are restricted to the 400 to 700 nm waveband. The sensor is positioned approximately 4 meters above the deck in order to avoid shadows from the ship's superstructure.