Research Interests

I study the atmosphere and ocean, and their role in weather and climate, using mathematical and numerical models and laboratory experiments.

My particular research interests and some recent highlights are listed below.

• Numerical modelling
  • I developed the Robert-Asselin-Williams (RAW) filter, which improves the leapfrog time-stepping scheme

  • I led the development of the Oxford QUAGMIRE model

  • I designed and coded a river-routing scheme for the SINTEX coupled general circulation model

• Geophysical fluid dynamics
  • I used the rotating annulus to study inertia-gravity waves and test quasi-geostrophic theory

  • I helped develop a better method for forecasting clear-air turbulence, which affects aviation

  • I helped show that sudden stratospheric warmings may be triggered by stochastic noise

• Climate dynamics
  • I discovered a new feedback on climate change from the hydrological cycle

  • I have studied the role of ocean salinity in climate

  • I estimated the rate at which ocean eddies lose energy to internal waves, powering deep mixing

For further details, see my Publications or Presentations.