Boehme, S. E.. Max Planck Institute for Marine Microbiology, sboehme@mpi-bremen.de
Riess, W. E.. Max Planck Institute for Marine Microbiology, wriess@mpi-bremen.de
Wenzhofer, F. Max Planck Institute for Marine Microbiology, fwenzho@mpi-bremen.de

 
BIOGEOCHEMICAL STUDIES OF BLACK SEA SEDIMENTS
 
In an effort to study Back Sea sediment biogeochemistry, in situ flux experiments were performed along an eleven station transect ranging from the shelf (75 m) to the deep basin (1340 m). In situ fluxes were determined for a number of species including DIC, NH4+, NO3+NO2, Mn and H2S. The flux chamber including the sediments is typically recovered undisturbed and so porewater analyses of DIC and del DIC were also performed at a few of the stations as well as determination of organic carbon content and porosity. The flux measurements will be compared and integrated with earlier determinations of Black Sea sediment biogeochemistry. The flux chambers are also equipped with oxygen sensors (electrodes and optrodes) for continuous monitoring of oxygen uptake over the course of the incubations at the shallower oxic stations. In addition to the measured fluxes, in situ diffusive oxygen uptake (DOU) was also measured at a few stations using a microprofiling lander. These results can be compared to flux chamber determinations of the total oxygen uptake (TOU) rates to assess the influence of biological uptake.
 
Day: Friday, Feb. 5
Time: 11:00 - 11:15am
Location: Sweeney Center
 
Code: CS63FR1100S