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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 18, issue 2
Ann. Geophys., 18, 247–251, 2000
https://doi.org/10.1007/s00585-000-0247-z
© European Geosciences Union 2000
Ann. Geophys., 18, 247–251, 2000
https://doi.org/10.1007/s00585-000-0247-z
© European Geosciences Union 2000

  29 Feb 2000

29 Feb 2000

Letter to the editor: Are the North Atlantic Oscillation and the Southern Oscillation related in any time-scale?

R. García1, P. Ribera1, L. Gimenoo2, and E. Hernández1 R. García et al.
  • 1Depto. Física de la Tierra II; Fac. CC. Físicas; Univ. Complutense de Madrid; Madrid 28040
  • 2Fac. Ciencias; Univ. Vigo; Ourense
  • Correspondence to: R. García
  • e-mail: rgarcia@6000aire.®s.ucm.es

Abstract. The North Atlantic Oscillation (NAO) and the Southern Oscillation (SO) are compared from the standpoint of a possible common temporal scale of oscillation. To do this a cross-spectrum of the temporal series of NAO and SO indices was determined, finding a significant common oscillation of 6-8 years. To assure this finding, both series were decomposed in their main oscillations using singular spectrum analysis (SSA). Resulting reconstructed series of 6-8 years oscillation were then cross-correlated without and with pre-whitened, the latter being significant. The main conclusion is a possible relationship between a common oscillation of 6-8 years' that represents about 20% of the SO variance and about 25% of the NAO variance.

Key words: Meteorology and atmospheric dynamics (climatology; ocean-atmosphere interactions)

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