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Citations since 2017
11 Research Items
I am a geochemist working on marine sediments and pore waters with a focus on element cycles, early diagenesis, paleoceanography and contaminants.
November 2018 - present
Ifremer - Centre de Brest
- PostDoc Position
October 2007 - October 2010
Marine anaerobic oxidation of ammonium (anammox) plays a central role in the nitrogen cycle of modern Oxygen Deficient Zones (ODZs). The newly developed bacteriohopanetetrol stereoisomer (BHT-x) biomarker for anammox, which is largely unaffected by early diagenesis, allows for the reconstruction of the presence and dynamics of past ODZs from the se...
Burial of organic material in marine sediments represents a dominant natural mechanism of long-term carbon sequestration globally, but critical aspects of this carbon sink remain unresolved. Investigation of surface sediments led to the proposition that on average 10-20% of sedimentary organic carbon is stabilised and physically protected against m...
The Mozambique continental margin experienced large variations in sedimentation rates, primarily due to re-routing of sediment deposition from the Zambezi River during the last glacial-Holocene transition. As changes in sediment accumulation and organic matter deposition impose a strong control on the formation of authigenic minerals in the sedimen...
Sediment samples from the Gulf of Alaska (GOA, IODP Expedition 341, Site U1417) have been analyzed to understand present and past diagenetic processes that overprint the primary sediment composition. No Sulfate-Methane Transition Zone (SMTZ) was observed at the zone of sulfate depletion, but a >200 m thick sulfate- and methane-free sediment interva...
Integrated Ocean Drilling Program (IODP) Site U1418 was drilled during Expedition 341 in 2013. The site is situated on the Surveyor Fan, one of the largest deep-sea fans in the world. The site was drilled to 972 m below seafloor, and a sediment record spanning ~1.2 My was attained. For this study, 285 sediment samples were analyzed for bulk geochem...
The Nansen Legacy paleo cruise was carried out from September 26 to October 20, 2018 with RV “Kronprins Haakon”. The cruise took place in the northern Barents Sea and the Nansen Basin, and it went through the sea ice to 83.3 N. The overriding objective of the cruise was to reconstruct the natural variability and range of sea ice cover and Atlantic...
Free access link before May 19, 2020: https://authors.elsevier.com/a/1apgY-JmAmJeR Organic-rich sediments of the southernmost Chilean Pacific coast and its fjord system constitute an important component of the global marine carbon budget. Sediment records from Trampa and Caribe bays and Churruca fjord in the western Magellan fjord system have been...
Deltaic margins at the outlets of the world's major rivers provide a highly dynamic sedimentary environment and are thus key areas in global biogeochemical cycles. The upper slope of the Mozambique margin is the largest river-fed deposition center along the Eastern African Margin. The tropical catchment area of the Zambezi River provides sediments...
Subproject of the PAMELA project (Passive Margin Exploration Laboratories) 1) What are the origin and fate of the methane (C budgeting)? 2) What is the influence of diagenetic processes on the sedimentary record for paleoreconstruction studies? 3) Can we link the actual position of the sulfate/methane transition zone with the sedimentation patterns?
1.)Reconstruct nutrient cycling and redox development in the Gulf of Alaska 2.) Investigate post-depositional changes in the sediment column (early diagenesis) 3.) Link sedimentation and paleoproductivity to global climate patterns