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Observing the Local Emergence of the Southern Ocean Residual-Mean Circulation ArchiMer
Sévellec, Florian; Naveira Garabato, A; Vic, Clement; Ducousso, N..
The role of mesoscale turbulence in maintaining the mean buoyancy structure and overturning circulation of the Southern Ocean is investigated through a 2‐year‐long, single‐mooring record of measurements in Drake Passage. The buoyancy budget of the area is successively assessed within the Eulerian and the Temporal‐Residual‐Mean frameworks. We find that a regime change occurs on timescales of 1 day to 100 days, characteristic of mesoscale dynamics, whereby the eddy‐induced turbulent horizontal advection balances the vertical buoyancy advection by the mean flow. We use these diagnostics to reconstruct the region's overturning circulation, which is found to entail an equatorward downwelling of Antarctic Intermediate and Bottom Waters and a poleward upwelling...
Tipo: Text Palavras-chave: Southern Ocean; Meridional overturning; Mesoscale turbulence; Residual-mean circulation; Eulerian circulation; Mooring measurements.
Ano: 2019 URL: https://archimer.ifremer.fr/doc/00485/59655/62687.pdf
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Incoherent signature of internal tides on sea level in idealized numerical simulations ArchiMer
Ponte, Aurelien; Klein, Patrice.
The non persistent phase relationship between internal tides and astronomical forcings, also known as incoherence, has been identified as a major question in the context of future wide-swath satellite altimetry. This study addresses this issue using a novel set of numerical experiments where a plane-wave/low-mode internal tide propagates through a turbulent mesoscale eddy field. These experiments demonstrate the emergence of internal tide incoherence as the eddy turbulence is strengthened. In strongly turbulent situations, the internal tide signature on sea level forms complex interference patterns with large amplifications of the initial internal wave. These patterns evolve more rapidly than the signature of the turbulent eddy field on sea level. The...
Tipo: Text Palavras-chave: Internal tide; Wide-swath altimetry; Mesoscale turbulence; Incoherence.
Ano: 2015 URL: https://archimer.ifremer.fr/doc/00254/36571/35109.pdf
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Surface vertical PV fluxes and subtropical mode water formation in an eddy-resolving numerical simulation ArchiMer
Maze, Guillaume; Deshayes, Julie; Marshall, John; Treguier, Anne-marie; Chronis, Alexandros; Vollmer, Lukas.
Subtropical mode waters are characterized by low potential vorticity (PV) and so the mechanisms by which PV is extracted from the ocean by air–sea interaction are of great relevance to our understanding of how mode waters are formed. This study analyzes those mechanisms by comparing the magnitude and spatial patterns of surface PV fluxes of diabatic and frictional origin in a high resolution numerical simulation of the North Atlantic. The model resolves mesoscale eddies and exhibits realism in the volume and regional distribution of subtropical mode water, both in the annual-mean and seasonal cycle. It is found that the diabatic and mechanic fluxes of PV through the sea surface are of similar amplitude locally, but their spatial structures are very...
Tipo: Text Palavras-chave: Subtropical mode water; Potential vorticity flux; Mesoscale turbulence.
Ano: 2013 URL: http://archimer.ifremer.fr/doc/00133/24434/22520.pdf
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