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You are here: Home / Events / Seminars / Seminaires Septembre 2019-Août 2020 / Mardi 17 Mars - Internal tides dynamics over the North Mid-Atlantic Ridge

Mardi 17 Mars - Internal tides dynamics over the North Mid-Atlantic Ridge

by SEMSOU last modified Jan 24, 2020 03:04 PM
When Mar 17, 2020
from 11:00 AM to 12:00 PM
Where salle Lyot
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Noé Lahaye

Post-doc CNES au LOPS à Brest, France

 

Title: Internal tides dynamics over the North Mid-Atlantic Ridge


Abstract: I will present some recent results on the internal tides dynamics over the northern Mid-Atlantic Ridge using realistic high-resolution numerical simulation. Investigating the internal tide energy cycle, from generation until dissipation, reveals strong disparities between different locations. In particular, large amplitude isolated seamounts strongly generate low-mode internal tide, while rough topography over the ridge yields smaller wavelength modes. As a result, wide portions of the ridge dissipate more energy in the internal tide field than they gain from the barotropic tidal conversion, a surprising result which evidences the important role of topographic scattering of low-mode internal tide into higher modes, up to dissipation. Specific aspects of the internal tide will also be discussed, focusing on its surface signature. Low mode internal tide exhibits a strong amplification in summer, which can be described and predicted quantitatively by means of linear theory. This mechanism has a strong impact on the seasonality of the near-surface kinetic energy and is sensitive to the details of the stratification near the base of the mixed layer.

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