FS Polarstern ANTXXVIII/5
|Ship name (ship code)||FS Polarstern (06AQ)|
|Cruise period||2012-04-11 — 2012-05-16|
|Port of departure||Punta Arenas, Chile|
|Port of return||Bremerhaven, Germany|
|Objectives||Continuous measurements of atmospheric and marine properties and energy and material fluxes between ocean and atmosphere. Instrument tests and observations of sea bird and marine mammals will be carried out, too. Additionally 32 stations are planned, where CTDs as well as underwater light measurements will take place.
The continuous measurements of atmospheric parameters and fluxes between ocean and atmosphere will be performed within the frame of the OCEANET project. Main subject of this project is the development of autonomous measurement systems for operational use on ships.
Together with comprehensive measurements of atmospheric aerosol and its optical properties, this allows for a detailed analyzes of the atmospheric state. Measurements of the oxygen isotope anomalies of ozone and nitrate will complete the atmospheric observations. Therefore, it is possible to investigate atmospheric transports.
At the CTD-stations water samples will be taken from different depths, which will be analysed with respect to a number of parameters. This comprises the investigation of bacteria of the Roseobacter clade, which are one of the most frequent procariotes in the marine eco systems. These bacteria are physiologically versatile species and play an important role for the oceanic global cycle of matters. Thus, the building of DOM (dissolved organic matter) is part of a complex cyclus, where beside the phytoplankton and viruses bacteria are of importance. Therefore, the dissolved organic matters will be analyzed, too. Within a project of the DAAD (Deutscher Akademischer Austausch Dienst) transition metals will be evaluated as well as CDOM and DOC (coloured dissolved organic matter and dissolved organic carbon) within the frame of a Eurofleet project. Underwater light measurements complement the investigations of dissolved organic matters.
Two CTD stations at the Vema Channel are part of a long term study of the global thermohaline circulation. Additional information about oceanic currents will be gathered by the ship's acoustic Doppler current profiler (ADCP).
On route, observations will take place about the occurrence of seabirds and marine mammals.
The cruise will be used to transport sediments and living creatures collected during previous legs to Bremerhaven. During the cruise investigations will be done of the mitochondrial functioning and its influence e.g. on osmotic regulation for Antarctic organism.
During the last part of the cruise from Las Palmas to Bremerhaven, deep sea acceptance tests of the modified sonar system Hydrosweep 3 will be carried out.
|Chief scientist||Karl Bumke (Helmholtz Centre for Ocean Research, Kiel (East Shore Campus))|