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Journal of Climate
This study uses National Centers for Environmental Prediction-National Center for Atmospheric Research reanalysis data to investigate the extent to which interannual zonal index (ZI) fluctuations occur in the atmosphere and whether interannual ZI fluctuations can be accounted for by climate noise associated with the intraseasonal ZI. By using an empirical orthogonal function analysis, it is shown that the ZI is indeed a prominent form of interannual variability, because the interannual ZIdoi:10.1175/1520-0442(2000)013<2356:iizmfv>2.0.co;2 fatcat:5nivae4osbdxvd4bf7dudw36uq