2012-09-25 Press release
Research online: new measuring technique enables innovative observations of the North Sea
The underwater data node has been designed by the Institute of Coastal Research at the Helmholtz-Zentrum Geesthacht and was developed in cooperation with the Alfred Wegener Institute for Polar and Marine Research (AWI).
It will allow year-round observations of the condition of the North Sea in areas that are difficult to access. The long-term data series are an important basis to investigate environmental changes in the North Sea. The node has already completed two successful test phases. Now, the measuring system is being permanently installed 700 metres to the north of Helgoland.
A team of the scientific diving centre at the AWI will connect the node at the sea floor where it will remain for several years. The data measured at the underwater node will also flow into the historic long-term data series “Helgoland Reede” of the AWI.
The underwater node itself consists of a 600 kilogramme supporting frame carrying the connectors for the instrument systems. The instruments are provided with electricity via a cable running from Helgoland so that the instruments do not rely on batteries, as is normally the case, but can be operated long-term without further maintenance requirements.
A fibre optic cable transmits the data to the scientists via Internet and enables remote operation of the instruments from the mainland. The coastal researchers have succeeded in developing the first underwater node for use in rough seas at depths of up to 300 metres. Due to its heavy weight the node maintains its position even during storms.
The underwater node is part of the Coastal Observation System for Northern and Arctic Seas (COSYNA) that was designed by the Helmholtz-Zentrum Geesthacht. Permanently installed sensors regularly measure currents, salinity, oxygen and other parameters.
The data is assimilated into computer models that forecast e.g. ocean currents. Research groups can utilize the node and attach additional instrumental systems. An example is a stereo camera system of the AWI that automatically observes and measures fish and jellyfish.
Two underwater frames (“Lander”) equipped with sensors from the AWI and the Centre of Marine Environmental Sciences in Bremen record physical processes near the sea floor and nutrient exchange between sea floor and water. All data is stored in the COSYNA databank maintained by the Helmholtz-Zentrum Geesthacht.
The node is part of the Coastal Observation System for Northern and Arctic Seas (COSYNA), developed by the Helmholtz-Zentrum Geesthacht. The investment costs are 600,000 euro. The Biological Institute Helgoland (Biologische Anstalt Helgoland), that is part of the Alfred Wegener Institute, will operate the node at its location.
The underwater node is part of routine observations of the North Sea carried out with COSYNA and thus helps to observe changes of the ecosystem at Helgoland. The analysis of the data is carried out by the Institute of Coastal Research and the Biological Institute Helgoland (Biologische Anstalt Helgoland). The data is publically available on the COSYNA Internet portal.
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