F. Kwasniok Data-based stochastic subgrid-scale parametrisation: an approach using cluster-weighted modelling
Full article (partial public access?) at Royal Society, doi:10.1098/rsta.2011.0384
Abstract
A new approach for data-based stochastic parametrisation of unresolved scales and processes in numerical weather and climate prediction models is introduced. The subgrid-scale model is conditional on the state of the resolved scales, consisting of a collection of local models. A clustering algorithm in the space of the resolved variables is combined with statistical modelling of the impact of the unresolved variables. The method is tested and explored in the framework of the Lorenz'96 model using discrete Markov processes as local statistical models. Performance of the scheme is investigated for long-term simulations as well as ensemble prediction. The present method clearly outperforms simple parametrisation schemes and compares favourably with another recently proposed more sophisticated subgrid scheme.