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Article Dans Une Revue Earth System Dynamics Année : 2021

A Dynamical Systems Characterisation of Atmospheric Jet Regimes

Résumé

Atmospheric jet streams are typically separated into primarily “eddy-driven” (or polar-front) jets and primarily “thermally driven” (or subtropical) jets. Some regions also display “merged” jets, resulting from the (quasi-)collocation of the regions of eddy generation with the subtropical jet. The different locations and driving mechanisms of these jets arise from very different underlying mechanisms and result in very different jet characteristics. Here, we link the current understanding of dynamical jet maintenance mechanisms, mostly arising from conceptual or idealized models, to the phenomena observed in reanalysis data. We specifically focus on developing a unitary analysis framework grounded in dynamical systems theory, which may be applied to both idealized models and reanalysis, as well as allowing for direct intercomparison. Our results illustrate the effectiveness of dynamical systems indicators to diagnose jet regimes.
Atmospheric jet streams are typically separated into primarily "eddy-driven", or "polar-front", jets and primarily "thermally-driven", or "subtropical" jets. Some regions also display "merged" jets, resulting from the (quasi) co-location of the regions of eddy generation with the subtropical jet. The different locations and driving mechanisms of these jets issue from very different underlying mechanisms, and result in very different jet characteristics. Here, we link the current understanding of the dynamical jet maintenance mechanisms, mostly issuing from conceptual or idealised models, to the phenomena observed in reanalysis data. We specifically focus on developing a unitary analysis framework, grounded in dynamical systems theory, which may be applied to both idealised models and reanalysis, and allow for direct intercomparison. Our results illustrate the use of dynamical systems indicators to diagnose jet regimes.
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Dates et versions

hal-02901407 , version 1 (03-03-2021)

Identifiants

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Gabriele Messori, Nili Harnik, Erica Madonna, Orli Lachmy, Davide Faranda. A Dynamical Systems Characterisation of Atmospheric Jet Regimes. Earth System Dynamics, 2021, 12, pp.233-251. ⟨10.5194/esd-12-233-2021⟩. ⟨hal-02901407⟩
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