As a scientist at Royal NIOZ and extra-ordinary Professor at the VU-Amsterdam, I pursue how sediments are formed under recent and past conditions of ocean-climate change. Topics range from seasonal particle production by biomineralising ocean plankton, to Sharan dust deposition, current transport of bottom sediment and coral carbonate geochemistry in response to changing ocean-climate. Through collaborative projects in ocean-going research , mainly in the Atlantic and western Indian Ocean I am addressing research questions pertaining to:
• Sediment genesis: the pathways of production, transformation and accumulation fluxes of sedimentary matter, notably biogenic carbonates, silica and organic compounds.
• Ocean-climate change: anthropogenic and natural variability of biogeochemical cycling and thermohaline circulation; high-resolution paleoceanography.
• Planktonic foraminifera: biodiversity and population dynamics, seasonality and intermittency of export fluxes, isotope and chemical composition, dissolution and sediment mixing; proxy validation, evolutionary paleoceanography.
• Physical forcing mechanisms: effects of stratification and mixing, eddy transports, thermo-haline circulation, re-suspension and sediment focussing.