Abstract
Models used for climate change impact projections are typically not tested for simulation beyond current climate conditions. Since we have no data truly reflecting future conditions, a key challenge in this respect is to rigorously test models using proxies of future conditions. This paper presents a validation framework and guiding principles applicable across earth science disciplines for testing the capability of models to project future climate change and its impacts. Model test schemes comprising split-sample tests, differential split-sample tests and proxy site tests are discussed in relation to their application for projections by use of single models, ensemble modelling and space-time-substitution and in relation to use of different data from historical time series, paleo data and controlled experiments. We recommend that differential-split sample tests should be performed with best available proxy data in order to build further confidence in model projections.
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The present study was funded by a grant from the Danish Council for Strategic Research for the project Centre for Regional Change in the Earth System (CRES—www.cres-centre.dk) under contract no: DSF-EnMi 09-066868.
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Refsgaard, J.C., Madsen, H., Andréassian, V. et al. A framework for testing the ability of models to project climate change and its impacts. Climatic Change 122, 271–282 (2014). https://doi.org/10.1007/s10584-013-0990-2
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DOI: https://doi.org/10.1007/s10584-013-0990-2