Machine Learning for Stochastic Parametrisation

This seminar will be delivered by Hannah Christensen, she will be discussing Machine Learning for Stochastic Parametrisation.

Atmospheric models used for weather and climate prediction are traditionally formulated in a deterministic manner. In other words, given a particular state of the resolved scale variables, the most likely forcing from the sub-grid scale motion is estimated and used to predict the evolution of the large-scale flow. However, the lack of scale-separation in the atmosphere means that this approach is a large source of error in forecasts. Over the last decade an alternative paradigm has developed: the use of stochastic techniques to characterise uncertainty in small-scale processes. These techniques are now widely used across weather, seasonal forecasting, and climate timescales.

While there has been significant progress in emulating parametrisation schemes using machine learning, the focus has been entirely on deterministic parametrisations. In this presentation she will discuss data driven approaches for stochastic parametrisation. She will describe experiments which develop a stochastic parametrisation using the generative adversarial network (GAN) machine learning framework for a simple atmospheric model. She will conclude by discussing the potential for this approach in complex weather and climate prediction models.

If you would like to attend this talk, please get in touch with Wouter Edeling from the SC group at CWI.

Please visit the seminar for Machine Learning and UQ in Scientific Computing webpage to get more information on upcoming seminars.