Evaluating salt-fingering theories
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ID: 305410
2008
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Abstract
The NATRE fine-and microstructure data set is revisited to test salt-finger amplitude theories.Dependences of the mixing efficiency ⌫, microscale buoyancy Reynolds number Re and thermal Cox number Cx T on 5-m density ratio R and gradient Richardson number Ri are examined.The observed mixing efficiency is too high to be explained by linear fastest-growing fingers but can be reproduced by wavenumbers 0.5-0.9times lower than the fastest-growing wavenumber.Constraining these fingers with a hybrid wave/finger Froude number or a finger Reynolds number cannot reproduce the observed trends with R or Ri, respectively.This suggests that background shear has no influence on finger amplitudes.Constraining average amplitudes of these lower-wavenumber fingers with finger Richardson number Ri f ϳ 0.2 reproduces the observed dependence of Re and Cx T on density ratio R and Ri at all but the lowest observed density ratio (R ϭ 1.3).Separately relaxing the assumptions of viscous control, dominance of a single mode and tall narrow fingers does not explain the difference between theory and data at low R for a critical Ri f ϳ 0.2.
| Reference Key |
openalex_W2084844210
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| Authors | Ryuichiro Inoue, Eric Kunze, Louis St. Laurent, Raymond W. Schmitt, John M. Toole |
| Journal | journal of marine research |
| Year | 2008 |
| DOI |
10.1357/002224008787157467
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| URL | |
| Keywords | Keywords not found |
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