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Department of Mathematical Sciences

Seminar Archives

On this page you can find information about seminars in this and previous academic years, where available on the database.

Numerical Analysis Seminars: Predictability of rotating stratified turbulence

Presented by Keith Ngan, Met Office, Exeter

20 March 2009 14:15 in CG60

Although predictability represents one of the fundamental  
problems in atmospheric science and nonlinear dynamics, gaps in our  
knowledge remain. Theoretical understanding of the inverse error  
cascade is limited mostly to homogeneous, isotropic turbulence, while  
numerical simulations have focused on highly complex numerical weather
prediction (NWP) models. These results cannot be easily reconciled.
       In this talk I describe the predictability of rotating  
stratified turbulence. The objective is to determine how the  
predictability varies with scale when the dynamics are more realistic  
than the idealised models that underlie the classical picture of  
predictability, yet free of the parameterisations that complicate  
interpretation of NWP models. Using a three-dimensional turbulence  
model of the nonhydrostatic Boussinesq equations, it is shown that the  
predictability behaviour departs from the classical picture due to the  
presence of inertia-gravity waves.

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