Evaluating salt-fingering theories
نویسندگان
چکیده
منابع مشابه
Mixing in a Moderately Sheared Salt-Fingering Layer
Mixing due to sheared salt fingers is studied by means of direct numerical simulations (DNS) of a doublediffusively unstable shear layer. The focus is on the ‘‘moderate shear’’ case, where shear is strong enough to produce Kelvin–Helmholtz (KH) instability but not strong enough to produce the subharmonic pairing instability. This flow supports both KH and salt-sheet instabilities, and the objec...
متن کاملSalt-fingering convection in the small diffusivity ratio limit
Doubly diffusive processes play a fundamental role in many physical phenomena of substantial geophysical and astrophysical importance. Despite much research basic questions, e.g. how primary and secondary instabilities saturate and how mean fields are generated, remain unresolved. In the salt-finger regime, we use a systematic asymptotic procedure to reduce the primitive equations to a prognost...
متن کاملInteraction of Kelvin-Helmholtz and salt sheet instabilities in a sheared, fingering-unstable layer
Motivated by observations of thermohaline staircases in the midlatitude oceans, we have conducted direct numerical simulations (DNS) of the evolution of a diffusively unstable shear layer. This flow supports both KH and salt sheet instabilities, and we wish to see how the two mechanisms work together to drive the transition to turbulence. The main controlling parameters are the bulk Richardson ...
متن کاملImportance of salt fingering for new nitrogen supply in the oligotrophic ocean
The input of new nitrogen into the euphotic zone constrains the export of organic carbon to the deep ocean and thereby the biologically mediated long-term CO2 exchange between the ocean and atmosphere. In low-latitude open-ocean regions, turbulence-driven nitrate diffusion from the ocean's interior and biological fixation of atmospheric N2 are the main sources of new nitrogen for phytoplankton ...
متن کاملTurbulence in a sheared , salt - fingering - favorable environment : 1 Anisotropy and effective diffusivities
5 Direct numerical simulations (DNS) of a shear layer with salt-fingering-favorable stratifica6 tion have been performed for different Richardson numbers Ri and density ratios Rρ. When 7 the Richardson number is infinite (unsheared case), the primary instability is square plan8 form salt-fingering, alternating cells of rising and sinking fluid. In the presence of shear, 9 salt-fingering takes t...
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ژورنال
عنوان ژورنال: Journal of Marine Research
سال: 2008
ISSN: 0022-2402,1543-9542
DOI: 10.1357/002224008787157467