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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 20, issue 12
Ann. Geophys., 20, 2077–2085, 2002
https://doi.org/10.5194/angeo-20-2077-2002
© Author(s) 2002. This work is distributed under
the Creative Commons Attribution 3.0 License.
Ann. Geophys., 20, 2077–2085, 2002
https://doi.org/10.5194/angeo-20-2077-2002
© Author(s) 2002. This work is distributed under
the Creative Commons Attribution 3.0 License.

  31 Dec 2002

31 Dec 2002

NAO influence on extreme winter temperatures in Madrid (Spain)

L. Prieto1, R. Garcia1, J. Diaz2, E. Hernandez1, and T. del Teso1 L. Prieto et al.
  • 1Depto. Fisica de la Tierra II, Fac. CC. Fisicas, Univ. Complutense de Madrid, Spain
  • 2Centro Universitario de Salud Publica, Universidad Autonoma de Madrid, Spain
  • Correspondence to: L. Prieto (luis@6000aire.fis.ucm.es)

Abstract. Extremely cold days (ECDs), with minimum temperatures lower than -4.6°C, have been analysed for Madrid. This threshold corresponds to the 5th percentile of the period 1963–1999. Adopting a case analysis approach, five synoptic patterns have been identified that produce these extremely low temperatures. Three of them are associated with cold air flows over the Iberian Peninsula, and the other two with a lack of significant circulation over the region. A nonlinear association with the North Atlantic Oscillation (NAO) has been identified using log-linear models. The NAO positive phase leads to an increase in the winter frequency of those synoptic patterns associated with stagnant air flow over Iberia, while those characterised by cold, northern flows do not appear to be similarly influenced.

Key words. Meteorology and atmospheric dynamics (climatology; synoptic-scale meteorology; general or miscellaneous)

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