Plattform Platform	Reise-Nr. Cruise-No.	Zeitraum Period	Projekt Project	Arbeitsgebiet Working area
Elisabeth Mann Borgese	EMB111	25.08.2015 - 06.09.2015	SECOS	Baltic Sea

Fahrtleiter Chief Scientist	Institut Institute	Auslaufhafen Port of departure	Einlaufhafen Port of return	Stationskarte Station map	Schiffsroute Trackchart
Arz Helge	Leibniz-Institut fur Ostseeforschung, Warnemunde	Rostock	Rostock

Ziel der Reise / Objectives of Cruise:

The major part of the cruise was used for investigation of near surface sediments at selected key-sites (type-localities for sand, mud and stone reefs) in German territorial waters and in the German exclusive economic zone (EEZ) of the Baltic Sea. In the frame of the German research project "SECOS" this was already the sixth cruise with focus on "functioning" of sedimentary deposits in relation to matter cycles (nutrients, gasses, pollutants) and sediment dynamics (transport, deposition). Special attention was paid on occurrence and activity of benthic macro fauna (bio-turbation) and on he fate of the freshly deposited organic matter. Another topic was to define bacterial communities in the different types of in terms of their composition and Sediment types, benthic colonization and bio-geochemical matter cycles are strongly dependent on environmental parameters as bathymetry, salinity, temperature, function. and oxygen. During the cruise, at the main SECOS-stations extensive work was done to obtain samples and measurements for characterizing these key sites on small scales. So called "Benthic Chambers" were deploy at 5 of the SECOS-stations for several days to measure "in situ" continuously hydro- chemical parameters and to collect water samples at a time series. Around the chambers or the key-sites, large numbers of surface sediment samples were taken by Multi-Corer and Grab sampler to investigate the "patchiness" or variability of benthic organisms as well as of sediment- and bio-geochemical parameters. Pore-water profiles obtained at short sediment cores are used for analysing water chemistry, nutrients and trace metals. CTD casts were run for online registration of temperature, salinity, oxygen, turbidity, chlorophyll etc. in the water column. Sea water samples were collected by bottles at selected depths for nutrient analyses. A large amount of pore-water and sea-water samples were measured on board for nutrients. In vicinity of the SECOS-key stations acoustic profiles (boomer, SES, MB) were run.

Messungen / Measurements