Empreinte de la variabilité intrinsèque océanique sur l'océan de surface : caractérisation et processus

Abstract : This work focuses on the intrinsic oceanic variability spontaneously generated under seasonal atmospheric forcing in high-resolution oceanic simulations (1/4 ? and 1/12 ? ) including mesoscale eddies (~ 100 km). The imprint of intrinsic variability on sea-level (SLA) and sea surface temperature (SST) is characterized in various spatio-temporal ranges using filtering methods. In particular, the small-scale interannual-to-decadal SLA variability observed by satellite altimetry, is stochastic and mostly intrinsic. At multi-decadal timescales, SLA intrinsic variability is comparable to the internal climate variability simulated in climate coupled models (devoid of oceanic turbulence), and may yield additional uncertainties in the detection of human-induced regional sea-level change. A spectral analysis eventually shows that non-linear advection of relative vorticity spontaneously transfers kinetic energy from high-frequency frontal waves to slower mesoscale eddies, ultimately generating low-frequency intrinsic variability. The analyses have been performed using tools developed for optimal processing of high-resolution oceanic dataset. This work generally provides evidence of the chaotic behavior of the turbulent ocean, whose interaction with the atmosphere is still poorly-known.
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Guillaume Sérazin. Empreinte de la variabilité intrinsèque océanique sur l'océan de surface : caractérisation et processus. Océan, Atmosphère. Université Paul Sabatier - Toulouse III, 2016. Français. ⟨NNT : 2016TOU30209⟩. ⟨tel-01540247⟩

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