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

• Main Authors: Garcia, R., Ribera, P., Gimenoo, L., Hernández, E.
• Other Authors: Departamento de Fisica de la Tierra II Madrid, Universidad Complutense de Madrid = Complutense University of Madrid Madrid (UCM), Facultade de Ciencias Campus Ourense, Universidade de Vigo
• Format: Article in Journal/Newspaper
• Language: English
• Published: HAL CCSD 2000
• Subjects: [SDU.OCEAN]Sciences of the Universe [physics]/Ocean; Atmosphere; [SDU.STU]Sciences of the Universe [physics]/Earth Sciences; North Atlantic; North Atlantic oscillation
• Online Access: https://hal.science/hal-00316579; https://hal.science/hal-00316579/document; https://hal.science/hal-00316579/file/angeo-18-247-2000.pdf

International audience 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.