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Underwater Node Description

The Node is designed for water depths of 10 m to 300 m and comprises land-based power unit and server providing 1000 VDC, a Gbit-network connection, and virtual computer technology for di¿ erent users. The land-based control system is connected to the underwater units via a ¿ breoptic and power-hybrid cable of up to 30 km length. Up to 10 instruments can be connected in a surrounding of 70 m. A secondary and tertiary underwater node unit can be connected thus extending distance from shore. For this task a development of a new instrument that can be used for unattended operation.

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Process scheme of the Under Water Node System


COSYNA Underwater Node System deployed off the island of Helgoland (photo: P. Fischer, AWI).

Underwater Node Typical Result

Under-ice observations at Spitsbergen (79° N) A profiling CTD connected to an Underwater Node System delivers year-round data off Spitsbergen. During closed ice cover from November 2014 to March 2015, stratification is weak and temperatures range between 0 and 3 °C. In April, the ice cover breaks up and warmer water from the ocean enters the bay, accompanied by larger turbidity. This was the first time that continuous observations have been carried out during the winter below the ice.

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Year-round measurements with a profiling CTD connected to a COSYNA Underwater Node System off Spitsbergen, Svalbard: Water temperature (C, upper panel), salinity (PSU, central panel), and turbidity FTU, lower panel).

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