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Eddy Topography Interactions on Eastern boundaries

This dataset, resulting from the "Bord Est" experiment (1989-1990), consists of data gathered from 7 moorings at various depths along the Iberian margin. It focuses on the analysis of tidal peaks, high-frequency gravity waves, and mean flow patterns, particularly in the sub-inertial range (2-80 days). Key questions include the mechanisms behind these ranges, the role of wind and eddy-induced turbulence, and their relationship to mesoscale turbulence. The study aims to sketch the coupling mechanisms between eddies and coastal trapped waves (CTW) within high-resolution simulations, highlighting the need for Eulerian time series for future investigations.

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Eddy Topography Interactions on Eastern boundaries

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  1. Eddy Topography Interactionson Eastern boundaries Arnaud Le Boyer – Guillaume Roullet LPO, Brest

  2. Dataset : « Bord Est » experiment • 7 moorings / several depths • Iberian margin • 1 yr long 1989-1990 u v

  3. Typical KE spectrum Tidal peaks High-frequency : gravity waves Mean flow Sub inertial range : T >> 1/f Coastal trapped waves (CTW)

  4. Questions: • What is the forcing mechanism for this subinertial range [2days - 80days] ? • Wind • Eddy induced ? • How is this turbulence over the slope related to the mesoscale turbulence ?

  5. Eddy-topography interaction • Mean current = Neptune effect • Transients ? Sketch of the coupling mechanism between eddies and CTW topography tends to force circulation along iso-f/H, associated transients = CTW

  6. Collaboration with DRAKKAR • Investigate this issue within realistic, high resolution (1/12) simulations • Compare spectra on slope to spectra offshore • Relative contributions wind vs. Eddies on transients currents • Need for Eulerian time series along continental margins

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