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Article Dans Une Revue Journal of the Atmospheric Sciences Année : 2009

Local Mixing Events in the Upper Troposphere and Lower Stratosphere. Part I: Detection with the Lyapunov Diffusivity

Emily Shuckburgh
  • Fonction : Auteur
Bernard Legras

Résumé

A new diagnostic (the “Lyapunov diffusivity”) is presented that has the ability to quantify isentropic mixing in diffusion units and detects local mixing events by describing latitude–longitude variability. It is a hybrid diagnostic, combining the tracer-based effective diffusivity with the particle-based Lyapunov exponent calculation. Isentropic mixing on the 350-K surface shows that there is significant longitudinal variation to the strength of mixing at the northern subtropical jet, with a strong mixing barrier over Asia and the western Pacific, a weaker mixing barrier over the western Atlantic, and active mixing regions at the jet exits over the eastern Pacific and Atlantic.
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hal-00759990 , version 1 (22-10-2021)

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Francesco d'Ovidio, Emily Shuckburgh, Bernard Legras. Local Mixing Events in the Upper Troposphere and Lower Stratosphere. Part I: Detection with the Lyapunov Diffusivity. Journal of the Atmospheric Sciences, 2009, 66, pp.3678. ⟨10.1175/2009JAS2982.1⟩. ⟨hal-00759990⟩
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