Using the MARAS system for the in situ characterizing of the spectral optical properties of the North Sea
The MArine RAdiometric Spectrometer (MARAS) has been developed to perform in situ spectral marine radiometry. The vector and scalar components of the upwelling and downwelling light field are measured simultaneously over a constant separation, enabling the estimation of the apparent and inherent optical properties of a water body. When combined with the active MARAS sub-system, the transmissometer and scatterometer, MARAS is capable of more fully describing the optical properties of the ocean. Results from a 1994 cruise in the North Sea are illustrated. The spectral absorption coefficient, the spectral reflectance and the spectral upwelling radiance for a number of sample sites at different depths are shown with concurrent sea truth data.