The solar normalized water-leaving spectral radiance is a basic ocean color remote-sensing parameter required for the vicarious calibration and bio-optical product development. Determination of normalized water-leaving spectral radiance using in-water radiometry requires measurements of the up-welling spectral radiance at several depths. The Marine Optical System (MOS) Remotely Operated Vehicle (ROV) is a portable, fiber-coupled, high-resolution spectroradiometer system with spectral coverage from 340 nm to 960 nm. MOS was developed at the same time as the Marine Optical Buoy (MOBY) spectrometer system and is optically identical except that it is configured as a profiling instrument. Concerns with instrument self-shadowing because of the large exterior dimensions of the MOS underwater housing led to adapting MOS and ROV technology. This system provides for measurement of the near-surface upwelled spectral radiance while minimizing the effects of shadowing. A major advantage of this configuration is that the ROV provides the capability to acquire measurements 5 cm to 10 cm below the water surface and is capable of very accurate depth control (1 cm) allowing for high vertical resolution observations within the very near-surface. We describe the integrated system and its characterization and calibration.
Proceedings Title: Proceedings of the SPIE| Optics and Photonics Conference | 2007 |
Conference Dates: August 26-30, 2007
Conference Title: SPIE
Pub Type: Conferences
CCD, fiber-optic coupled spectrograph, Marine Optical System, ocean color, radiance, Remotely Operated Vehicle, validation