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Underwater Spectroradiometer

A Multi-Depth Underwater Spectroradiometer for Validation of Remotely-Sensed Ocean Color and Estimation of Seawater Biogeochemical Properties

A unique mobile, deployable, multi-depth submersible, spectro-radiometer (AquaTree) was designed and key elements of it deployed and tested at sea. Currently profiler devices are used to measure radiance & irradiance as they sink into the water, producing data points that are not correlated in time, and are not ideal for radiative transfer analysis of ocean color. The AquaTree offers an improved device by enabling simultaneous up/downwelling radiance and irradiance measurements at multiple depths. These measurements can be averaged over time, scaling up to several minutes if desired, which mitigates effects due to waves and surface ripple, and provides more representative data for RT models.  The spectro-radiometers are designed for simultaneous long integrations time, and  wide dynamic range associated with radiation field between the surface to 10 m depth. Radiance and irradiance collectors were designed, built and tested to feed signals to a spectro-radiometers placed in a watertight enclosure equipped with 36 fiber and electrical connectors.

Underwater Spectroradiometer

 

Tree structure with submerged (1 meter long) branches housing light collectors.

Tree structure with submerged (1 meter long) branches housing light collectors.

AquaTree on Pier

 

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