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Investigating Southern Ocean Water Mass Circulation and Biogeochemistry: A Multi-Proxy Approach

This master thesis proposal focuses on the Southern Ocean's water mass circulation and biogeochemical processes, emphasizing its vital role in the global carbon cycle and climate change. It employs a multi-proxy approach, analyzing nutrients like NO3-, NH4+, and urea, as well as utilizing isotopes (15N, 13C, 14C, 30Si, 32Si) and algae biomarkers to assess carbon export and remineralization. Through methods such as isotope dilution and HR-ICP-MS, the study aims to unravel the complex dynamics of oceanic circulation and enhance our understanding of climatic impacts. Contact us for research opportunities!

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Investigating Southern Ocean Water Mass Circulation and Biogeochemistry: A Multi-Proxy Approach

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

  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. NO3-, NH4+, urea CO2 , HCO3- Si(OH)4 Multi-proxy approach to assess C export and mineralization Atmosphere CO2 15N, 13,14C, 30,32Si, algae biomarkers Surface layer 234Th F ratio, new production, Pk communities C Export production 100m Bad Mesopelagic Zone Baxs Water mass pathway + Better constrain the Baxs proxy C remineralization 1000m Deep water Bottom

  4. Master Thesis proposal 2006-2007 “ Dissolved barium to investigate the water mass pathways in the Southern Ocean and better constrain the Baxs proxy “ ANT XXII/3; Weddell sea Analysis of dissolved Barium in seawater and comparison of Ba results with the other physical and biogeochemical water mass properties. 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

  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 

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