Can rounding errors be beneficial for weather and climate models?

3 June 2014
11:00
Dr Peter Dueben
Abstract
Inexact hardware trades reduced numerical precision against a reduction in computational cost. A reduction of computational cost would allow weather and climate simulations at higher resolution. In the first part of this talk, I will introduce the concept of inexact hardware and provide results that show the great potential for the use of inexact hardware in weather and climate simulations. In the second part of this talk, I will discuss how rounding errors can be assessed if the forecast uncertainty and the chaotic behaviour of the atmosphere is acknowledged. In the last part, I will argue that rounding errors do not necessarily degrade numerical models, they can actually be beneficial. This conclusion will be based on simulations with a model of the one-dimensional Burgers' equation.
  • Applied Dynamical Systems and Inverse Problems Seminar