Parameterizing surface and internal tide scattering and breaking on supercritical topography: The one- and two-ridge cases

TitleParameterizing surface and internal tide scattering and breaking on supercritical topography: The one- and two-ridge cases
Publication TypeJournal Article
Year of Publication2013
AuthorsKlymak J.M, Buijsman M., Legg S., Pinkel R
JournalJournal of Physical Oceanography
Volume43
Pagination1380-1397
Date Published2013/07
Type of ArticleArticle
ISBN Number0022-3670
Accession NumberWOS:000329778000009
KeywordsDiapycnal mixing; dissipation; flow; hawaiian ridge; internal waves; kaena ridge; Mixing; model; ocean; Subgrid-scale processes; tides; turbulence; waves
Abstract

A parameterization is presented for turbulence dissipation due to internal tides generated at and impinging upon topography steep enough to be supercritical with respect to the tide. The parameterization requires knowledge of the topography, stratification, and the remote forcingeither barotropic or baroclinic. Internal modes that are arrested at the crest of the topography are assumed to dissipate, and faster modes assumed to propagate away. The energy flux into each mode is predicted using a knife-edge topography that allows linear numerical solutions. The parameterization is tested using high-resolution two-dimensional numerical models of barotropic and internal tides impinging on an isolated ridge, and for the generation problem on a two-ridge system. The recipe is seen to work well compared to numerical simulations of isolated ridges, so long as the ridge has a slope steeper than twice the critical steepness. For less steeply sloped ridges, near-critical generation becomes more dominant. For the two-ridge case, the recipe works well when compared to numerical model runs with very thin ridges. However, as the ridges are widened, even by a small amount, the recipe does poorly in an unspecified manner because the linear response at high modes becomes compromised as it interacts with the slopes.

DOI10.1175/jpo-d-12-061.1
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