Planning for the next phase of the Paleoclimate Modelling Intercomparison Project (PMIP7)

The Paleoclimate Modelling Intercomparison Project (PMIP) was launched in 1995 and has since closely followed the phases of the Coupled Model Intercomparison Project (CMIP) providing understanding of past climate states based on the latest Global Climate Models and evaluation of their capacity to represent climates very different from the recent one. PMIP is planning its next phase, in the wake of CMIP7 launch (Dunne et al., 2024). CMIP7 is organised along two main phases: the Fast Track, to be delivered in time for its results to be analysed and published for the seventh assessment report of the IPCC (Intergovermental Panel on Climate Change), followed by the main phase of CMIP7. This poster will describe the rationale of including an idealised paleoclimate simulation, "abrupt-127k", in the Fast Track set of experiments. This experiment starts from the Fast Track pre-industrial control experiment and then abruptly changes the astronomical parameters to those for 127,000 years ago (as well as some minor greenhouse gas changes). This will allow analyses of the sensitivity of the Arctic sea ice to conditions favouring its summer decrease or even collapse, and can be extended to become a last interglacial simulation (lig127k). The poster will also briefly describe the other experiments that are expected to be included in the next phase of PMIP. We are looking forward to discussions of key experiments, analyses, challenges with the PMIP and CMIP communities alike. Dunne et al., 2024: https://doi.org/10.5194/egusphere-2024-3874