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The accuracy of weather types in climate models depends on the resolution of the models

The accuracy of weather types in climate models depends on the resolution of the models

Although the relatively short duration of a few days and high variability of weather types have a significant role in local weather conditions, fairly little attention has been paid to them when climate models have been evaluated.

We used climate model material and an automated classification programme to calculate the frequency and persistence of weather types and the probability of transitioning between weather types in the Australian region. Considerable differences were found between models but, generally speaking, models that simulated the frequencies of the weather types in a realistic way also simulated their persistence and the probabilities of transitioning in a realistic way,' says Research Professor Petteri Uotila. Horizontal resolution was high in the most realistic models while vertical resolution and the representation of the upper atmosphere were not clearly linked with the accuracy of the weather types in the model.

More information:

Researchprofessor Petteri Uotila, tel. +358 50 361 0587,

Gibson, P. B., P. Uotila, S. E. Perkins-Kirkpatrick, L. V. Alexander, and A. J. Pitman (2016), Evaluating synoptic systems in the CMIP5 climate models over the Australian region, Climate Dynamics, doi:10.1007/s00382-015-2961-y.


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