# Environmental Science and Engineering Seminar

Wednesday, November 20, 2013
4:00pm to 5:00pm
Within the next couple of years we expect the resolution of many IPCC-class ocean models to increase to values around 1/4 degree. At this resolution models can produce eddy-like disturbances, but can still not properly resolve eddies at all relevant scales. Adequate parameterizations representing sub-grid eddy effects are thus necessary. Most eddy permitting models presently employ some kind of hyper-viscosity, which in the eddy-permitting" regime causes a significant amount of energy dissipation. However, higher resolution simulations show that only enstrophy, but almost no energy, should be dissipated at scales below the grid-scale. As a result of the artificial energy sink associated with viscous parameterizations, the eddy fields in eddy permitting models are typically not energetic enough.