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Stochastically Perturbed Parametrisation (SPP)
The Stochastically Perturbed Parametrisation (SPP) scheme has been developed over several years to improve characteristics of the perturbed forecasts, such as spread. The Stochastically Perturbed Parametrization (SPP) scheme, introduced in Cy49r1 in autumn 2024, replaced the previously used Stochastically Perturbed Parametrization Tendency (SPPT).
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It should be stressed that overall stochastic perturbations undoubtedly do deliver clear improvements in particular aspects of ensemble performance.
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(Note: In older material there may be references to issues that have subsequently been addressed)
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