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Decadal climate prediction with a refined anomaly initialisation approach

Climate Dynamics volume 48, pages 1841–1853 (2017)Cite this article

Abstract

In decadal prediction, the objective is to exploit both the sources of predictability from the external radiative forcings and from the internal variability to provide the best possible climate information for the next decade. Predicting the climate system internal variability relies on initialising the climate model from observational estimates. We present a refined method of anomaly initialisation (AI) applied to the ocean and sea ice components of the global climate forecast model EC-Earth, with the following key innovations: (1) the use of a weight applied to the observed anomalies, in order to avoid the risk of introducing anomalies recorded in the observed climate, whose amplitude does not fit in the range of the internal variability generated by the model; (2) the AI of the ocean density, instead of calculating it from the anomaly initialised state of temperature and salinity. An experiment initialised with this refined AI method has been compared with a full field and standard AI experiment. Results show that the use of such refinements enhances the surface temperature skill over part of the North and South Atlantic, part of the South Pacific and the Mediterranean Sea for the first forecast year. However, part of such improvement is lost in the following forecast years. For the tropical Pacific surface temperature, the full field initialised experiment performs the best. The prediction of the Arctic sea-ice volume is improved by the refined AI method for the first three forecast years and the skill of the Atlantic multidecadal oscillation is significantly increased compared to a non-initialised forecast, along the whole forecast time.

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Notes

  1. The anomaly of a field is defined as its deviation from the mean state (climate), calculated over a period of at least 30 years (according to the World Meteorological Organisation definition).

  2. The function composition is the application of one function on top of another function and it is indicated with the symbol \(\circ\).

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Acknowledgments

The authors acknowledge funding support for this study from the SPECS (ENV-2012-308378) Project funded by the Seventh Framework Programme (FP7) of the European Commission and the PICA-ICE (CGL2012-31987) Project funded by the Ministry of Economy and Competitiveness of Spain. E.H. was also funded by the UK Natural Environment Research Council and N.K.N. was funded in part by the UK Natural Environment Research Council. D.V. gratefully acknowledges financial support from the University of Reading. The authors thankfully acknowledge the computer resources, technical expertise and assistance provided by the Red Española de Supercomputación through the Barcelona Supercomputing Center.

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Authors and Affiliations

  1. Institut Català de Ciències del Clima (IC3), Barcelona, Spain

    Danila Volpi, Virginie Guemas & Francisco J. Doblas-Reyes

  2. Department of Mathematics and Statistics, University of Reading, Reading, UK

    Danila Volpi & Nancy K. Nichols

  3. Centre National de Recherches Météorologiques/Groupe de Meteorologie Grande Echelle et Climat, Météo-France, CNRS, Toulouse, France

    Virginie Guemas

  4. Institució Catalana de Recerca i Estudis Avançats (ICREA), Barcelona, Spain

    Francisco J. Doblas-Reyes

  5. Barcelona Supercomputing Center-Centro Nacional de Supercomputación (BSC-CNS), Barcelona, Spain

    Francisco J. Doblas-Reyes

  6. Department of Meteorology, National Centre for Atmospheric Science, University of Reading, Reading, UK

    Ed Hawkins

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  1. Danila Volpi
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  2. Virginie Guemas
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Correspondence to Danila Volpi.

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Volpi, D., Guemas, V., Doblas-Reyes, F. et al. Decadal climate prediction with a refined anomaly initialisation approach. Clim Dyn 48, 1841–1853 (2017). https://doi.org/10.1007/s00382-016-3176-6

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Keywords

  • Decadal climate prediction
  • Full field initialisation
  • Refined anomaly initialisation