Multiscale measures of phase-space trajectories

Research output: Contribution to journalJournal articleResearchpeer-review

  • Tommaso Alberti
  • Giuseppe Consolini
  • Ditlevsen, Peter
  • Reik Donner
  • Virgilio Quattrociocchi

Characterizing the multiscale nature of fluctuations from nonlinear and nonstationary time series is one of the most intensively studied contemporary problems in nonlinear sciences. In this work, we address this problem by combining two established concepts-empirical mode decomposition (EMD) and generalized fractal dimensions-into a unified analysis framework. Specifically, we demonstrate that the intrinsic mode functions derived by EMD can be used as a source of local (in terms of scales) information about the properties of the phase-space trajectory of the system under study, allowing us to derive multiscale measures when looking at the behavior of the generalized fractal dimensions at different scales. This formalism is applied to three well-known low-dimensional deterministic dynamical systems (the Henon map, the Lorenz '63 system, and the standard map), three realizations of fractional Brownian motion with different Hurst exponents, and two somewhat higher-dimensional deterministic dynamical systems (the Lorenz '96 model and the on-off intermittency model). These examples allow us to assess the performance of our formalism with respect to practically relevant aspects like additive noise, different initial conditions, the length of the time series under study, low- vs high-dimensional dynamics, and bursting effects. Finally, by taking advantage of two real-world systems whose multiscale features have been widely investigated (a marine stack record providing a proxy of the global ice volume variability of the past

5 x

10 6 years and the SYM-H geomagnetic index), we also illustrate the applicability of this formalism to real-world time series.

Original languageEnglish
Article number123116
JournalChaos
Volume30
Issue number12
Number of pages15
ISSN1054-1500
DOIs
Publication statusPublished - 3 Dec 2020

    Research areas

  • EMPIRICAL MODE DECOMPOSITION, POWER SPECTRA, INTERMITTENCY, SYNCHRONIZATION, DIMENSION, ENTROPY, NUMBER, NOISE, AE

ID: 253648364