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Controllability and ergodicity of 3D primitive equations driven by a finite-dimensional force
Pierre-Marie Boulvard, Peng Gao, Vahagn Nersesyan · 2020-10-13 · via math.PR updates on arXiv.org

We study the problems of controllability and ergodicity of the system of 3D primitive equations modeling large-scale oceanic and atmospheric motions. The system is driven by an additive force acting only on a finite number of Fourier modes in the temperature equation. We first show that the velocity and temperature components of the equations can be simultaneously approximately controlled to arbitrary position in the phase space. The proof is based on Agrachev-Sarychev type geometric control approach. Next, we study the controllability of the linearisation of primitive equations around a non-stationary trajectory of randomly forced system. Assuming that the probability law of the forcing is decomposable and observable, we prove almost sure approximate controllability by using the same Fourier modes as in the nonlinear setting. Finally, combining the controllability of the linearised system with a criterion from arXiv:1802.03250, we establish exponential mixing for the nonlinear primitive equations with a random force.

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