Model complexity versus ensemble size: allocating resources for climate prediction

Ferro, Christopher A.T.; Jupp, Tim E.; Lambert, F. Hugo; Huntingford, Chris; Cox, Peter M.. 2012 Model complexity versus ensemble size: allocating resources for climate prediction. Philosophical Transactions of the Royal Society of London, A, 370 (1962). 1087-1099.

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A perennial question in modern weather forecasting and climate prediction is whether to invest resources in more complex numerical models or in larger ensembles of simulations. If this question is to be addressed quantitatively, then information is needed about how changes in model complexity and ensemble size will affect predictive performance. Information about the effects of ensemble size is often available, but information about the effects of model complexity is much rarer. An illustration is provided of the sort of analysis that might be conducted for the simplified case in which model complexity is judged in terms of grid resolution and ensemble members are constructed only by perturbing their initial conditions. The effects of resolution and ensemble size on the performance of climate simulations are described with a simple mathematical model, which is then used to define an optimal allocation of computational resources for a range of hypothetical prediction problems. The optimal resolution and ensemble size both increase with available resources, but their respective rates of increase depend on the values of two parameters that can be determined from a small number of simulations. The potential for such analyses to guide future investment decisions in climate prediction is discussed.

Item Type: Publication - Article
Digital Object Identifier (DOI):
Programmes: CEH Topics & Objectives 2009 - 2012 > Biogeochemistry > BGC Topic 2 - Biogeochemistry and Climate System Processes
UKCEH and CEH Sections/Science Areas: Reynard
ISSN: 1364-503X
Additional Keywords: general circulation models, initial condition ensembles, mean-squared error, resolution, weather forecasting
NORA Subject Terms: Computer Science
Meteorology and Climatology
Atmospheric Sciences
Date made live: 02 Feb 2012 12:19 +0 (UTC)

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