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Article Dans Une Revue Earth System Dynamics Année : 2019

Minimal dynamical systems model of the Northern Hemisphere jet stream via embedding of climate data

Résumé

We derive a minimal dynamical systems model for the northern hemisphere mid-latitude jet dynamics by embedding atmospheric data, and investigate its properties (bifurcation structure, stability, local dimensions) for different atmospheric flow regimes. The derivation is a three-step process: first, we obtain a 1-D description of the mid-latitude jet-stream by computing the position of the jet at each longitude using the ERA-Interim reanalysis. Next, we use the embedding procedure to derive a map of the local jet position dynamics. Finally, we introduce the coupling and stochastic effects deriving from both atmospheric 5 turbulence and topographic disturbances to the jet. We then analyze the dynamical properties of the model in different regimes: one that gives the closest representation of the properties extracted from real data; one featuring a stronger jet (strong coupling); one featuring a weaker jet (weak coupling); and one with modified topography. Our model, notwithstanding its simplicity, provides an instructive description of the dynamical properties of the atmospheric jet.
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Dates et versions

hal-02895042 , version 1 (09-07-2020)

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Davide Faranda, Yuzuru Sato, Gabriele Messori, Nicholas Moloney, Pascal Yiou. Minimal dynamical systems model of the Northern Hemisphere jet stream via embedding of climate data. Earth System Dynamics, 2019, 10 (3), pp.555-567. ⟨10.5194/esd-10-555-2019⟩. ⟨hal-02895042⟩
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