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    Combining interdependent climate model outputs in CMIP5: A spatial Bayesian approach

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    Type
    Preprint
    Authors
    Huang, Huang cc
    Hammerling, Dorit
    Li, Bo
    Smith, Richard
    KAUST Department
    Computer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division
    Date
    2019-12-31
    Permanent link to this record
    http://hdl.handle.net/10754/661035
    
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    Abstract
    Projections of future climate change rely heavily on climate models, and combining climate models through a multi-model ensemble is both more accurate than a single climate model and valuable for uncertainty quantification. However, Bayesian approaches to multi-model ensembles have been criticized for making oversimplified assumptions about bias and variability, as well as treating different models as statistically independent. This paper extends the Bayesian hierarchical approach of Sansom et al. (2017) by explicitly accounting for spatial variability and inter-model dependence. We propose a Bayesian hierarchical model that accounts for bias between climate models and observations, spatial and inter-model dependence, the emergent relationship between historical and future periods, and natural variability. Extensive simulations show that our model provides better estimates and uncertainty quantification than the commonly used simple model mean. These results are illustrated using data from the CMIP5 model archive. As examples, for Central North America our projected mean temperature for 2070-2100 is about 0.6 K lower than the simple model mean, while for East Asia it is 0.35-0.9 K higher; however, in both cases, the widths of the 90% credible intervals are of the order 4-7 K, so the uncertainties overwhelm the relatively small differences in projected mean temperatures.
    Sponsors
    We thank Gab Abramowitz and Nadja Herger for providing the gridded near-surface air temperature data in CMIP5 and the reanalysis data sets. We thank Michael Wehner for providing information in interpreting our findings of highly-correlated climate model pairs.
    Publisher
    arXiv
    arXiv
    2001.00074
    Additional Links
    https://arxiv.org/pdf/2001.00074
    Collections
    Preprints; Computer, Electrical and Mathematical Science and Engineering (CEMSE) Division

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