AOPP (Oxford University)

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.

This will be a discussion on Stochastic Parameterisation, led by Hannah.