1. Frank Dehairs’s multi-proxy team The Southern Ocean Water Mass Circulation and Biogeochemistry Stéphanie Jacquet (ANCH) Marc Elskens (ANCH) Anne Julie Cavagna (ANCH) Damien Cardinal (MRAC, Tervuren)

2. The Southern Ocean 18 % of the World Ocean, circumpolar distribution Active hydrological and ecological dynamics Key role in the global C cycle and climatic changes

3. CO 2, HCO 3 - NO 3 -, NH 4 +, urea Si(OH) 4 15 N, 13,14 C, 30,32 Si, algae biomarkers 234 Th Ba xs Surface layer Mesopelagic Zone Deep water Bottom F ratio, new production, Pk communities C Export production C remineralization Water mass pathway + Better constrain the Ba xs proxy Ba d Atmosphere 100m 1000m Multi-proxy approach to assess C export and mineralization CO2

4. Analytical part: * Isotope dilution method * ICP-MS and HR-ICP-MS instruments (inductively coupled plasma mass spectrometry) * Optimization of the method on the HR-ICP-MS instrument ANT XXII/3; Weddell sea Master Thesis proposal 2006-2007 “ Dissolved barium to investigate the water mass pathways in the Southern Ocean and better constrain the Ba xs proxy “ Analysis of dissolved Barium in seawater and comparison of Ba results with the other physical and biogeochemical water mass properties.

5. If you’re interested in Analytical chemistry & biogeochemistry The southern Ocean The global C cycle & climatic changes If you’re interested in doing research... Fell free to contact us with any questions ! Thank you