Gregor Rehder

Prof. Dr.

• SUMSUN - StUdien zur Marinen CO₂-Sequestrierung durch Untersuchung natürlicher hydrothermaler CO₂-Austritte im Nördlichen Westpazifik:
  
  Within the project SUMSUN, natural emissions of liquid CO₂ in the Okinawa Trough are investigated, covering the fields of biogeochemistry, oceanography, and biology. The focus of the project is to assess in how far these unique hydrothermal CO₂ see can serve as analogue for scenarios of CO₂ disposal in the deep sea, currently discusses as an option for the mitigation of rising CO₂ levels in the atmosphere.

• BONUS Baltic Gas - Methane emission in the Baltic Sea: Gas storage and effects of climate change and eutrophication:
  
  BALTIC GAS aims to understand how climate change and long-term eutrophication affect the accumulation of shallow gas and the emission of methane and hydrogen sulfide from the seabed to the water column and atmosphere. The outcome of the project will be a new understanding and quantitative synthesis of the dynamics and budget of methane in the seabed, an important but poorly understood component of the Baltic ecosystem response to natural and human- induced impacts. The project aims to develop a predictive model of gas accumulation and emission under realistic scenarios of climate change and eutrophication, which will improve the knowledge base for necessary future policy actions. The multidisciplinary project will involve 12 partner institutions from 5 nations and will apply modern advanced technology and novel combinations of approaches.

• SUGAR - Submarine gas hydrate deposits: exploitation, mining and transport - Subproject B3: "Improved hydrate pellet technologies for the transport of natural gas":
  
  The project SUGAR investigates the explotation of marine gas hydrates as a potential future energy resource. The entire chain from exploration to exploration and transport will be considered. Subproject B3 assesses techniques for the transport of natural gas in form of gas hydrates in a metastable form. The tasks of IOW "Optimization of gas hydrates for transport: systematics of dissociation kinetics" is to parameterize the dissociation kinetics of gas hydrates under varying temperatures and with various gas compositions. The scope is to optimize the boil off of gas from gas hydrates in the window of metastability.

• N. Bigalke, G. Rehder and G. Gust, Experimental Investigation of the Rising Behavior of CO₂ Droplets in Seawater under Hydrate-Forming Conditions, Environm. Sci. & Technol., doi: 10.1021/es800228, 2008
• S. Mau, G. Rehder, I. G. Arroyo, J. Gossler, and E. Suess: Indications of a link between seismo-tectonics and methane release from seeps off Costa Rica, Geophys. Geochem. Geosys., Q04003, doi:10.1029/2006GC0013262, 2007
• G. Rehder, H. von Neuhoff, S. von Neuhoff: Expedition Tiefsee, KOSMOS Verlag, Stuttgart, 140pp, ISBN: 978-3-440-10708-9 (2006)
• P. Linke, K. Wallmann, E. Suess, C. Hensen, and G. Rehder: In situ benthic from an intermittently active mud volcano ath the Costa Rica convergent margin. – Earth  Planet. Sci. Letts. 235, 79-95 (2005)
• K. U. Heeschen, R. W. Collier, M. A. de Angelis, E. Suess, G. Rehder, P. Linke, and G. P. Klinkhammer: Methane sources, distributions, and fluxes from cold vent sites at Hydrate Ridge, Cascadia Margin – Global Biogeochem. Cycl. 19, GB2016, doi: 10.1029/2004GB002266 (2005)
• G. Rehder, P.G. Brewer, E.T. Peltzer, L. Stern, S. Kirby, B. Durham: Dissolution rates of pure methane and hydrate and carbon-dioxide hydrate in undersaturated seawater at 1000 m depth. – Geochim. Cosmochim. Acta 68 (2), 285-292 (2004)
• K.U. Heeschen, R. S. Keir, G. Rehder, O. Klatt, and E. Suess: Methane dynamics in the Weddell Sea determined via stable isotope ratios and CFC-11, Global Biogeochem. Cycles 18, GB2012, doi:10.1029/2003GB002151 (2004)