Dr. Christian Hansen (Marine Geochemistry): The biodegradability of hydrothermally altered deep-sea dissolved organic matter, Dr. Helena Osterholz (Marine Geochemistry): Molecular composition and diversity of dissolved organic matter in a temperate estuary, Michael Kossack (Microbiogeochemistry): Application of the short-lived radio-isotopes 222Rn and 223,224Ra as porewater tracers in an intertidal sandy beach aquifer at Spiekeroog (master thesis), Ronja Paffrath (Marine Isotope Geochemistry): Influence of the boundary conditions in the Arctic Ocean on the distribution of neodymium isotopes and rare earth element concentrations, Corinna Oster (Marine Geochemistry): Variability of dissolved organic matter at different hydrothermal vent sites located at the Kermadec Arc (master thesis), Julia Kirchner (Microbiogeochemistry): Accelerated weathering of limestone: Modeling local impacts on carbonate chemistry of the southern North Sea, Corinna Oster (Marine Geochemistry): Variability of dissolved organic matter at different hydrothermal vent sites located at the Kermadec Arc (master thesis), Bianca Torres Liguori Pires (Marine Isotope Geochemistry): TBA, Maricarmen Igarza (Marine Geochemistry): Dissolved organic matter cycling during a mesocosm experiment in the coastal upwelling system off central Peru, Dr. Maciej Bartosiewicz (University of Basel; Guest Marine Geochemistry): Carbon in global lakes: methane cycle and paradox, Prof. Dr. Rainer Lohmann (University of Rhode Island; HWK-Fellow; Guest Marine Geochemistry): Passive sampling of organic pollutants and dissolved organic matter