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Climate Dynamics

, Volume 53, Issue 12, pp 7381–7396 | Cite as

Evaluation of the skill of North-American Multi-Model Ensemble (NMME) Global Climate Models in predicting average and extreme precipitation and temperature over the continental USA

  • Louise J. SlaterEmail author
  • Gabriele Villarini
  • Allen A. Bradley
Article

Abstract

This paper examines the forecasting skill of eight Global Climate Models from the North-American Multi-Model Ensemble project (CCSM3, CCSM4, CanCM3, CanCM4, GFDL2.1, FLORb01, GEOS5, and CFSv2) over seven major regions of the continental United States. The skill of the monthly forecasts is quantified using the mean square error skill score. This score is decomposed to assess the accuracy of the forecast in the absence of biases (potential skill) and in the presence of conditional (slope reliability) and unconditional (standardized mean error) biases. We summarize the forecasting skill of each model according to the initialization month of the forecast and lead time, and test the models’ ability to predict extended periods of extreme climate conducive to eight ‘billion-dollar’ historical flood and drought events. Results indicate that the most skillful predictions occur at the shortest lead times and decline rapidly thereafter. Spatially, potential skill varies little, while actual model skill scores exhibit strong spatial and seasonal patterns primarily due to the unconditional biases in the models. The conditional biases vary little by model, lead time, month, or region. Overall, we find that the skill of the ensemble mean is equal to or greater than that of any of the individual models. At the seasonal scale, the drought events are better forecast than the flood events, and are predicted equally well in terms of high temperature and low precipitation. Overall, our findings provide a systematic diagnosis of the strengths and weaknesses of the eight models over a wide range of temporal and spatial scales.

Keywords

Seasonal forecasting NMME Flood Drought Multi-model ensemble Model biases 

Notes

Acknowledgments

The authors thank the NMME program partners and acknowledge the help of NCEP, IRI and NCAR personnel in creating, updating and maintaining the NMME archive, with the support of NOAA, NSF, NASA and DOE. This study was supported by NOAA’s Climate Program Office’s Modeling, Analysis, Predictions, and Projections Program, Grant#NA15OAR4310073. Gabriele Villarini also acknowledges financial support from the USACE Institute for Water Resources and from Grant/Cooperative Agreement Number G11 AP20079 from the United States Geological Survey. Its contents are solely the responsibility of the authors and do not necessarily represent the official views of NOAA, USACE or of the USGS.

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2016

Authors and Affiliations

  • Louise J. Slater
    • 1
    Email author
  • Gabriele Villarini
    • 1
  • Allen A. Bradley
    • 1
  1. 1.IIHR-Hydroscience and EngineeringThe University of IowaIowa CityUSA

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