CPDN beta/en: Unterschied zwischen den Versionen
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Aktuelle Version vom 11. Dezember 2015, 19:29 Uhr
Testing and optimization of CPDN model applications, beta2
The aim of this study is to place a paleo-constraint on climate sensitivity in the climateprediction.net ensemble. Sensitivity is here defined as the equilibrium temperature response to doubling of pre-industrial carbon dioxide concentrations. Some of the climateprediction.net models have shown a large sensitivity and by applying models to past climates, we are testing if the models and their corresponding sensitivity are realistic. The general circulation model results are compared to paleo-observations. We are aiming to provide a framework for the evaluation of the climate models to see if they are able to simulate climates that were different from today. This will improve our confidence in the models projections for future climates. The period of focus is the mid-Holocene, i.e. ~6000 years before present (6kyBP). Why use the mid-Holocene climate to benchmark our models? The current climate is not in equilibrium. It is changing. The previous period in time with a stable climate was the mid-Holocene, when the climate was stable for a period of about 2000 years and the forcing on the climate is well known. The 6kyBP climate is reasonably well known through paleo- observations. The model used is HadSM3, a state-of-the-art climate model from the Hadley Centre for Climate Prediction and Research Atmospheric General Circulation Model coupled to a slab ocean. Mid-Holocene boundary conditions are applied to the model, i.e. the orbital configuration is altered to represent that of 6000 years ago. This redistributes the latitudinal and seasonal distribution of incoming solar radiation at the top of the atmosphere in the model. The model you download consists of 4 different phases, each of 15 model years
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