Nonlinear saturation of the large scale flow in a laboratory model of the quasibiennial oscillation | Zendy

Benoît Semin | Zendy; Nabil Garroum | Zendy; François Pétrélis | Zendy; S. Fauve | Zendy

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Nonlinear saturation of the large scale flow in a laboratory model of the quasibiennial oscillation

Author(s) -

Benoît Semin,

Nabil Garroum,

François Pétrélis,

S. Fauve

Publication year - 2018

Publication title -

physical review letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 3.688

H-Index - 673

eISSN - 1079-7114

pISSN - 0031-9007

DOI - 10.1103/physrevlett.121.134502

Subject(s) - instability , nonlinear system , dissipative system , physics , oscillation (cell signaling) , stratosphere , supercritical fluid , saturation (graph theory) , mechanics , bifurcation , flow (mathematics) , perturbation (astronomy) , meteorology , thermodynamics , mathematics , quantum mechanics , combinatorics , biology , genetics

The quasibiennial oscillation (QBO) is the nearly periodic reversal of the large scale flow generated by internal waves in the equatorial stratosphere. Using a laboratory model experiment, we study the instability that generates the QBO and investigate its nonlinear regime. We report the first quantitative measurements of the nonlinearly saturated velocity of the flow. We show that the QBO is generated by a bifurcation that is either supercritical or subcritical depending on the dominant dissipative process. This is confirmed by a nonlinear analysis in the vicinity of the instability threshold.

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