• a Lagrangian description of the thermohaline circulation, together with colleagues from the Southampton National Oceanography Centre, in particular Alberto Naveira Garrabato. You can view an illustration with movies of this work. You can also view a presentation on the zonal overturning circulation in the Indian Ocean, and a presentation on the origin of intermediate waters crossing the Atlantic equator.
• The role of internal waves in diapycnal mixing in the ocean with Leo Maas (NIOZ, Texel), see the presentation on geometrical focusing of internal waves.
• At present I participate in the BSIK-program on monitoring the North Atlantic thermohaline circulation and studying the relation between the THC and climate variations over Europe. I work on this together with the postdoc Eric van der Swaluw. See also
  Presentations
• ESSENCE - A project within the DEISA distributed supercomputing initiative. A large-member ensemble of runs with a state-of-the-art climate model was performed to investigate the range of possible future climate change. More information here. You can view an illustration with movie of the work I'm carrying out: impact of a THC-collapse on the atmosphere.
• A predecessor of ESSENCE was the CHALLENGE project, in which a 62-member ensemble of climate scenario runs was carried out with CCSM1.4. You can view a presentation on detection of future MOC changes, and a presentation on future changes in MOC-variability.
• I'm involved the "Drakkar" Project DRAKKAR, running the French Ocean Model OPA in a global configuration on a quarter of a degree resolution. We performed a fifty year hindcast using NCEP and ECMWF reanalysis data as forcing.
• Together with Nanne Weber and people from Utrecht University (Appy Sluis) I am preparing a simulation of the Palaeocene-Eocene Thermal Maximum (PETM) with the IFS model, the atmospheric component of the new KNMI/ECMWF climate model, ECEARTH.

I supervised four PhD-students: