![]() ![]() The lead/lag correlation between the PVO index and the NAM indices at various pressure levels. The numbers above the curves are indicative of the time scales of the first five peak values of the power spectral density function. The abscissa is the frequency (number of cycles per 300 months) and the ordinate is the normalized variance on a logarithm scale. The power spectral density function is estimated using an AR1200 model. Power spectral density of the daily PVO index shown in Fig. The red portions of the time series are indicative of the PVO events used in the composite analysis. The abscissa is PV latitude and the ordinate is isentropic surface (K).ĭaily time series of the first EOF mode (or the PVO index) shown in Fig. ![]() ![]() Negative anomalies are shaded and have dashed contours. Spatial pattern of the first EOF mode of the daily PV anomalies over the entire Northern Hemisphere in the θ-PVLAT coordinate. ![]()
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