García Herrera, Ricardo FranciscoRibera, PedroGimeno, LuisHernández Martín, Emiliano2023-06-202023-06-202000-020992-7689https://hdl.handle.net/20.500.14352/59846© EGS - Springer-Verlag 2000. Topical Editor F. Vial thanks F. Lott for his help in evaluating this paper.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.engjournal articlehttp://www.ann-geophys.net/18/247/2000/angeo-18-247-2000.pdfhttp://www.ann-geophys.net/open access52HemisphereExtensionDynamicsPressureAstrofísicaAstronomía (Física)