Abstract
This study aims at understanding the summer ocean-atmosphere interactions in the North Atlantic European region on intraseasonal timescales. The CNRMOM1d ocean model is forced with ERA40 (ECMWF Re-Analysis) surface fluxes with a 1-h frequency in solar heat flux (6 h for the other forcing fields) over the 1959–2001 period. The model has 124 vertical levels with a vertical resolution of 1 m near the surface and 500 m at the bottom. This ocean forced experiment is used to assess the impact of the North Atlantic weather regimes on the surface ocean. Composites of sea surface temperature (SST) anomalies associated with each weather regime are computed and the mechanisms explaining these anomalies are investigated. Then, the SST anomalies related to each weather regime in the ocean-forced experiment are prescribed to the ARPEGE Atmosphere General Circulation Model. We show that the interaction with the surface ocean induces a positive feedback on the persistence of the Blocking regime, a negative feedback on the persistence of the NAO-regime and favours the transition from the Atlantic Ridge regime to the NAO-regime and from the Atlantic Low regime toward the Blocking regime.
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Acknowledgments
This work formed part of a PhD. Thesis at the Centre National de Recherches Météorologiques, Toulouse, funded by Météo-France and the Commissariat à l’Energie Atomique (CEA). The authors wish to thank Soline Bielli for her help in applying the weather regime classification and Pascal Terray and Eric Maisonnave for the availability of their statistical package STATPACK. The two anonymous reviewers are greatly acknowledged for their interesting suggestions. This study was supported by the European Commission’s 6th Framework Programme (ENSEMBLES, contract GOCE-CT-2003-505539).
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An erratum to this article can be found at http://dx.doi.org/10.1007/s00382-010-0771-9
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Guemas, V., Salas-Mélia, D., Kageyama, M. et al. Summer interactions between weather regimes and surface ocean in the North-Atlantic region. Clim Dyn 34, 527–546 (2010). https://doi.org/10.1007/s00382-008-0491-6
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DOI: https://doi.org/10.1007/s00382-008-0491-6