A perturbed physics ensemble (PPE) is generated by varying the values of parameters in a given climate model, thus creating different variants of that model, and making simulations using each variant. The production of PPEs in UKCP09 takes into account parameter errors, which arise as a result of incomplete or imprecise knowledge of the actual values of the climate model parameters that are used to represent processes within the climate model. By perturbing (varying) climate model physical parameters within plausible ranges to create different variants, and making a projection of climate change for each variant, it is possible to quantify the impact of this source of uncertainty in resultant climate projections.
Ideally, the full range of variability of each model parameter would be explored simultaneously, and a unique climate projection generated. To do so is currently computationally prohibitive. In UKCP09 therefore, the atmosphere PPE is generated by running 280 variants of the Met Office Hadley Centre climate model HadSM3 (the slab-ocean model version of HadCM3). The resulting PPE is used to train a statistical emulator with allows a larger range of variability in the model parameters to be explored and quantified.
A perturbed physics ensemble (PPE) is generated by varying the values of parameters in a given climate model, thus creating different variants of that model, and making simulations using each variant. The production of PPEs in UKCP09 takes into account parameter errors, which arise as a result of incomplete or imprecise knowledge of the actual values of the climate model parameters that are used to represent processes within the climate model. By perturbing (varying) climate model physical parameters within plausible ranges to create different variants, and making a projection of climate change for each variant, it is possible to quantify the impact of this source of uncertainty in resultant climate projections.Ideally, the full range of variability of each model parameter would be explored simultaneously, and a unique climate projection generated. To do so is currently computationally prohibitive. In UKCP09 therefore, the atmosphere PPE is generated by running 280 variants of the Met Office Hadley Centre climate model HadSM3 (the slab-ocean model version of HadCM3). The resulting PPE is used to train a statistical emulator with allows a larger range of variability in the model parameters to be explored and quantified.
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