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During leg 15-1 of the german research Vessel Maria S. Merian, HYPOX scientists will carry outinvestigations in the Black sea . The HYPOX partner institutions involved in the cruise include MPI, AWI, Eawag, GKSS, Ifremer, IBSS, INGV, ITU, SAMS, and Uni-HB/MARUM. The BlackSea shelf is a natural laboratory for studying the biogeochemical signatures of oxygen depletionthe water column and sedimentary record, as the Black Sea is the largest anoxic water bodyon Earth. The transition zone between oxygen rich and oxygen depleted water is found atwater depth. During the cruise MSM15/1 the focus lies on new technologies for in situ measurements of oxygen dynamics and associated biogeochemical processes in the BlackSea. The first target area is the Turkish shelf and slope impacted by the inflow of oxicMediterranean water to the anoxic Black Sea. Here, in situ water column sampling andsediment coring will be carried out along a depth transect. The second study site is the Crimeanshelf, where surveys using MEDUSA tows as well as deployments of the benthic crawler MOVEand the submersible JAGO will be conducted to map the hydrographical conditions, thedistribution of the chemocline (transition zone between oxic andsulfidic waters) and thebenthic habitat structure. Numerous sensor platforms and sampling tools will provide a 3D image of biogeochemical processes in the hypoxic-anoxic transition zone of the Black Sea aswell as on the changing biodiversity.The mission will also contribute to the EU ARGO programby deploying floats and profilers in the western and northern Black Sea.
R/V Maria S. Merian. photo: www.briese.de
HYPOX student Zeynep Erdem taking samples on a previous cruise to the istanbul strait area. photo: M. Guenter, MPI
The expected cruise track and the working areas of lag 15-1 of R/V Maria S. Merian: image: www.aquarius.geomar.de, F. Janssen, MPI
Stay tuned to learn more about the cruise: during the cruise the scientist will regularly update a weblog on the cruise and on first results. please follow this link or visit www.mpi-bremen.de.
text: M. Schloesser, A. Boetius, F. Janssen
in 100-250 m
Thomas Soltwedel from the german Alfred Wegener Institute for Polar and Marine Research (AWI) organizes a workshop on oxygen measurements at the deep-sea long-term observatory HAUSGARTEN, which serves as an open ocean reference site within HYPOX. The prime intention of the workshop is to compile and secure all oxygen records assessed during the last 10 years of intense multidisciplinary studies at HAUSGARTEN observatory by a variety of methods: on board Winkler titrations of bottom water and in-situ incubation chamber samples, in-situ and on board microprofiler measurements as well as short- and long-term measurements with 1D Aanderaa optodes and 2D planar optodes. The compiled data will be transferred to the PANGAEA repository and thus be available via the HYPOX data portal. Workshop participants plan to use the data to assess fluxes and remineralization of organic matter and its influence on sediment oxygenation as well as for the analysis of long term trends in bottom water oxygen concentration.
All in all eight scientists from three institutions join the workshop at AWI: Cécile Cathalot & Christophe Rabouille (CEA-CNRS), Eberhard Sauter, Frank Wenzhöfer, Ingo Schewe & Thomas Soltwedel (AWI), and Janine Felden (MPI-MM). Colleagues from UGOT are not attending the workshop but provide their oxygen data collected at HAUSGARTEN in summer 2007.
Figure 1: One of the buildings of the AWI in Bremerhaven (Germany), the institution that hosts the workshop
Figure 2: the logo of Pangaea, the data archive that hosts the HAUSGARTEN data
Text: Thomas Soltwedel & Felix Janssen
