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https://doi.org/10.5194/egusphere-2024-3308
https://doi.org/10.5194/egusphere-2024-3308
29 Oct 2024
 | 29 Oct 2024
Status: this preprint is open for discussion.

Nonlinear causal dependencies as a signature of the complexity of the climate dynamics

Stéphane Vannitsem, X. San Liang, and Carlos A. Pires

Abstract. Nonlinear quadratic dynamical dependencies of large-scale climate modes are disentangled through the analysis of the rate of information transfer. Eight dominant climate modes are investigated covering the tropics and extratropics over the North Pacific and Atlantic. A clear signature of nonlinear influences at low-frequencies (time scales larger than a year) are emerging, while high-frequencies are only affected by linear dependencies. These results point to the complex nonlinear collective behavior at global scale of the climate system at low-frequencies, supporting earlier views that regional climate modes are local expressions of a global intricate low-frequency variability dynamics, which is still to be fully uncovered.

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Stéphane Vannitsem, X. San Liang, and Carlos A. Pires

Status: open (until 14 Dec 2024)

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  • RC1: 'Comment on egusphere-2024-3308', Anonymous Referee #1, 05 Nov 2024 reply
Stéphane Vannitsem, X. San Liang, and Carlos A. Pires
Stéphane Vannitsem, X. San Liang, and Carlos A. Pires

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Short summary
Large-scale modes of variability are present in the climate system. These modes are known to have influences on each other, but usually viewed as linear influences. The nonlinear connections among a set of key climate indices are here explored using tools from information theory, which allow for characterizing the causality between indices. It is found that quadratic nonlinear dependencies between climate indices are present at low-frequencies, reflecting the complex nature of its dynamics.