Plattform Platform	Reise-Nr. Cruise-No.	Zeitraum Period	Projekt Project	Arbeitsgebiet Working area
Heincke	HE383	22.06.2012 - 03.07.2012		North Sea

Fahrtleiter Chief Scientist	Institut Institute	Auslaufhafen Port of departure	Einlaufhafen Port of return	Stationskarte Station map	Schiffsroute Trackchart
Ludmann T.	Institut fur Biogeochemie und Meereschemie der Universitat Hamburg	Bremerhaven	Bremerhaven

Ziel der Reise / Objectives of Cruise:

The main purpose of the cruise was to test three senor-equipped autonomous devices developed in the framework of the COSYNA project. The three Lander systems served to study the sediment-water boundary layer. Because logistically only 2 landers could be operated at once, the cruise was split into 2 legs (22-27.6 and 28.6-3.7). Additional to the lander program a moored McLane autonomous sampling device was tested. The cruise could be regarded as a pilot study of the BMBF NOAH project (North Sea - Observation and Assessment of Habitats) which starts in 2013. The project is an integrated approach to evaluate utilization, status, performance and provision of services of seafloor habitats and ecosystems in the German Bight. To reach this goal 8 reference areas (4.5 x 4.5 nm) are selected to be studied in detail and later extrapolated to similar sediment provinces. Two of them (Fig. 1, C and E) were investigated during this cruise, including the area around Heligoland. Within each box at least one lander deployment was carried out, accompanied by sediment and water sampling, CTD as well as subbottom and multibeam profiles. The landers were deployed ca. 25 hours comprising a full tidal cycle. One of the lander (SedObs, MARUM) is equipped with acoustic sensors to provide data on 3D micro-topography, sedimentology, turbidity profiles, velocity profiles and local turbulence. The other 2 landers (NusOBS, HZG and AWI) are designed to measure in situ benthic sediment-water oxygen and nutrient fluxes as well as burial of nutrients in the sediments. Subbottom and multibeam profiling was conducted to study surface and subsurface sediment structures, allowing to deduce lateral sediment transport phenomena. The observed bedforms stationary and mobile should give information about current direction and speed, helping to characterize the prevailing current regime within the selected reference habitats. On 27th of June a COSYNA Knoten was pick up from Heligoland harbor and deployed in the channel between Heligoland and the small island Dune adjacent to a field of tetrapodes. The 'Knoten' is an underwater node that interfaces for underwater observing networks. The node is stationary and can be equipped with different sensors and also provide power and broad band data communication to many instruments from different users. Later, the connected instruments can be remote controlled via internet.

Messungen / Measurements