| Complex dynamical phenomena in the Earth atmosphere and climate typically involve a wide range of temporal and spatial scales. In studies of the low-frequency variability on seasonal to decadal time scales oscillatory phenomena have been detected that probably posses a nonlinear origin and exhibit phase synchronization between oscillatory modes extracted either from different types of climate-related data or data recorded at different locations on the Earth [1-4]. In this study we focus on nonlinear interactions between dynamics on different temporal scales in about a century long records of daily mean surface air temperature from various European locations using conditional mutual information together with the Fourier-transform and multifractal surrogate data methods [5]. Information transfer from larger to smaller scales has been observed as the influence of the phase of slow oscillatory phenomena with periods around 6-11 years on amplitudes of the variability characterized by smaller temporal scales from a few months to 4-5 years. The overall effect of the slow oscillations on the inter-annual temperature changes within the range 1-2 K has been observed in large areas of Europe.
References
[1] M. Palus and D. Novotna, “Common Oscillatory Modes in Geomagnetic Activity, NAO Index and
Surface Air Temperature Records", J. Atmos. Sol.-Terr. Phys., 69, 2405-2415 (2007)
[2] M. Palus and D. Novotna, “Phase-coherent Oscillatory Modes in Solar and Geomagnetic Activity
and Climate Variability", J. Atmos. Sol.-Terr. Phys., 71, 923-930 (2009)
[3] Y. Feliks, M. Ghil, and A.W. Robertson, “ Oscillatory Climate Modes in the Eastern Mediterranean and Their Synchronization with the North Atlantic Oscillation”, J. Clim. 23, 4060-4079 (2010)
[4] M. Palus and D. Novotna, “Northern Hemisphere Patterns of Phase Coherence between Solar/Geomagnetic Activity and NCEP/NCAR and ERA40 Near-surface Air Temperature in Period 7-8 Years Oscillatory Modes", Nonlin. Proc. Geophys., 18, 251-260 (2011)
[5] M. Palus, “Bootstrapping Multifractals: Surrogate Data from Random Cascades on Wavelet Dyadic Trees”, Phys. Rev. Lett. 101, 134101 (2008) |