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Toward global maps ...
Toward global maps of internal tide energy sinks
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de Lavergne, C. (author)
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- Falahat, Saeed (author)
- Stockholms universitet,Meteorologiska institutionen (MISU)
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Madec, G. (author)
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- Roquet, Fabien, 1982 (author)
- Gothenburg University,Göteborgs universitet,Institutionen för marina vetenskaper,Department of marine sciences
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- Nycander, Jonas (author)
- Stockholms universitet,Meteorologiska institutionen (MISU)
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Vic, C. (author)
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(creator_code:org_t)
- Elsevier BV, 2019
- 2019
- English.
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In: Ocean Modelling. - : Elsevier BV. - 1463-5003 .- 1463-5011. ; 137, s. 52-75
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https://doi.org/10.1...
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https://urn.kb.se/re...
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Abstract
Subject headings
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- Internal tides power much of the observed small-scale turbulence in the ocean interior. To represent mixing induced by this turbulence in ocean climate models, the cascade of internal tide energy to dissipation scales must be understood and mapped. Here, we present a framework for estimating the geography of internal tide energy sinks. The mapping relies on the following ingredients: (i) a global observational climatology of stratification; (ii) maps of the generation of M-2, S-2 and K-1 internal tides decomposed into vertical normal modes; (iii) simplified representations of the dissipation of low-mode internal tides due to wave-wave interactions, scattering by small-scale topography, interaction with critical slopes and shoaling; (iv) Lagrangian tracking of low-mode energy beams through observed stratification, including refraction and reflection. We thus obtain a global map of the column-integrated energy dissipation for each of the four considered dissipative processes, each of the three tidal constituents and each of the first five modes. Modes >= 6 are inferred to dissipate within the local water column at the employed half-degree horizontal resolution. Combining all processes, modes and constituents, we construct a map of the total internal tide energy dissipation, which compares well with observational inferences of internal wave energy dissipation. This result suggests that tides largely shape observed spatial contrasts of dissipation, and that the framework has potential in improving understanding and modelling of ocean mixing. However, sensitivity to poorly constrained parameters and simplifying assumptions entering the parameterized energy sinks calls for additional investigation. The attenuation of low-mode internal tides by wave-wave interactions needs particular attention.
Subject headings
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Oceanografi, hydrologi och vattenresurser (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Oceanography, Hydrology and Water Resources (hsv//eng)
- NATURVETENSKAP -- Geovetenskap och miljövetenskap (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences (hsv//eng)
Keyword
- Ocean mixing
- Internal tides
- Energy dissipation
- Parameterization
- parametric subharmonic instability
- ocean circulation
- deep-ocean
- turbulent dissipation
- wave-propagation
- finescale parameterizations
- geographical-distribution
- part ii
- scattering
- topography
- Ocean mixing
Publication and Content Type
- ref (subject category)
- art (subject category)
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