arXiv subjects

David Docquier

Publications and source records attributed to David Docquier.

3 recordsLinked to original sources

arXiv2024

Sources of low-frequency $\delta^{18}$O variability in coastal ice cores from Dronning Maud Land

The low-frequency variability of the $\delta^{18}$O recorded in ice cores (FK17 and TIR18) recently drilled at two different locations in Dronning Maud Land (Antarctica), is investigated using multi-taper spectral method and singular spectrum analysis. Multiple dominant peaks emerge in these records with periods between 3 and 20 years. The two sites show distinct spectral signatures, despite their relative proximity in space (about 100 km apart), suggesting that different processes are involved in generating the variability at these two sites. In order to clarify which processes are acting on $\delta^{18}$O at these two locations, the impact of several climate indices as well as sea ice area is investigated using a causal method, known as the Liang-Kleeman rate of information transfer. The analysis of the origin of this low-frequency variability from external sources reveals that El Ni\~no-Southern Oscillation (ENSO), the Pacific Decadal Oscillation (PDO), the Southern Annular Mode (SAM), the Dipole Mode Index (DMI) and the sea ice area display important causal influences on $\delta^{18}$O at FK17. For TIR18, the main influences are from ENSO, PDO, DMI, the sea ice area, and the Atlantic Multidecadal Oscillation (AMO), revealing the complexity of the interactions in Dronning Maud Land. The two locations share several drivers, but also show local specificities potentially linked to ocean proximity and differences in air mass trajectories. The implication of these findings on the low-frequency variability in the two ice cores is discussed.

physics.ao-ph↗

arXiv2024

Causal dependencies and Shannon entropy budget -- Analysis of a reduced order atmospheric model

The information entropy budget and the rate of information transfer between variables is studied in the context of a nonlinear reduced-order atmospheric model. The key ingredients of the dynamics are present in this model, namely the baroclinic and barotropic instabilities, the instability related to the presence of an orography, the dissipation related to the surface friction, and the large-scale meridional imbalance of energy. For the parameter chosen, the solutions of this system display a chaotic dynamics reminiscent of the large-scale atmospheric dynamics in the extra-tropics. The detailed information entropy budget analysis of this system reveals that the linear rotation terms plays a minor role in the generation of uncertainties as compared to the orography and the surface friction. Additionally, the dominant contribution comes from the nonlinear advection terms, and their decomposition in synergetic (co-variability) and single (impact of each single variable on the target one) components reveals that for some variables the co-variability dominates the information transfer. The estimation of the rate of information transfer based on time series is also discussed, and an extension of the Liang's approach to nonlinear observables, is proposed.

physics.ao-ph↗

arXiv2023

A general theory to estimate Information transfer in nonlinear systems

A general theory for computing information transfers in nonlinear stochastic systems driven by deterministic forcing and additive and/or multiplicative noises, is presented. It extends the Liang-Kleeman framework of causality inference to nonlinear cases based on information transfer across system variables (Liang, 2016). We present an effective method of computing formulas of the rates of Shannon entropy transfer (RETs) between selected causal and consequential variables, relying on the estimation from data of conditional expectations of the system forcing and their derivatives. Those expectations are approximated by nonlinear differentiable regressions, leading to a much easier and more robust way of computing RETs than the brute-force approach calling for numerical integrals over the state-space and the knowledge of the multivariate probability density of the system. The approach is fully adapted to the case where no model equations are available, starting with a nonlinear model fitting from data of the consequential variables, and the subsequent application of method to the fitted model. RETs are decomposed into sums of single one-to-one RETs plus synergetic terms (of pure nonlinear nature) accounting for the joint causal effect of groups of variables. State-dependent RET formulas are also introduced, showing where in state-space the entropy transfers and local synergies are more relevant. A comparison of the RETs estimations is performed with previous methods in the context of two models: (i) a model derived from a potential function and (ii) the classical chaotic Lorenz system, both forced by additive and/or multiplicative noises. The analysis demonstrates that the new estimations are robust, cheaper, and less data-demanding, providing evidence of the possibilities and generalizations offered by the method and opening new perspectives on real-world applications.

nlin.CD↗