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Clément Guilloteau, Antonios Mamalakis, Lawrence Vulis, Phong V. V. Le, Tryphon T. Georgiou, and Efi Foufoula-Georgiou

identified by the rsPCA in the 500-mb GPH at that same frequency of 15 days. Therefore, this mode is interpreted as the signature of an atmospheric Rossby wave on the SST and reveals ocean–atmosphere coupling. This shows the ability of the spectral PCA to extract coherent modes of low amplitude from random variability and noise. Fig . 17. First unrotated eigenvector (magnitude and phase) at the 15-day period of the sPCA applied to daily SST anomalies. The eastward propagating signal is interpreted as the

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Abby Stevens, Rebecca Willett, Antonios Mamalakis, Efi Foufoula-Georgiou, Alejandro Tejedor, James T. Randerson, Padhraic Smyth, and Stephen Wright

-scale modes of climate variability, and more commonly the state of ENSO ( Schonher and Nicholson 1989 ; Redmond and Koch 1991 ; Mo and Higgins 1998 ; McCabe and Dettinger 1999 ; Cayan et al. 1999 ). Physically, El Niño (or La Niña) events typically associate with persistent low (or high) atmospheric pressure patterns over the northeastern Pacific (a teleconnection that materializes via quasi-stationary Rossby waves; Trenberth et al. 1998 ; Castello and Shelton 2004 ), and thus disturb the location

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