1) La descarga del recurso depende de la página de origen
2) Para poder descargar el recurso, es necesario ser usuario registrado en Universia


Detalles del recurso

Descripción

Upper-ocean turbulence at scales smaller than the mesoscale is believed to exchange surface and thermocline waters, which plays an important role in both physical and biogeochemical budgets. But what energizes this submesoscale turbulence remains a topic of debate. Two mechanisms have been proposed: mesoscale-driven surface frontogenesis and baroclinic mixed-layer instabilities. The goal here is to understand the differences between the dynamics of these two mechanisms, using a simple quasi-geostrophic model. The essence of mesoscale-driven surface frontogenesis is captured by the well-known surface quasi-geostrophic model, which describes the sharpening of surface buoyancy gradients and the subsequent breakup in secondary roll-up instabilities. We formulate a similarly archetypical Eady-like model of submesoscale turbulence induced by mixed-layer instabilities. The model captures the scale and structure of this baroclinic instability in the mixed layer. A wide range of scales are energized through a turbulent inverse cascade of kinetic energy that is fuelled by the submesoscale mixed-layer instability. Major differences to mesoscale-driven surface frontogenesis are that mixed-layer instabilities energize the entire depth of the mixed layer and produce larger vertical velocities. The distribution of energy across scales and in the vertical produced by our simple model of mixed-layer instabilities compares favourably to observations of energetic wintertime submesoscale flows, suggesting that it captures the leading-order balanced dynamics of these flows. The dynamics described here in an oceanographic context have potential applications to other geophysical fluids with layers of different stratifications.

Pertenece a

Caltech Authors  

Autor(es)

Callies, Jörn -  Flierl, Glenn -  Ferrari, Raffaele -  Fox -  Kemper, Baylor - 

Id.: 70873200

Versión: 1.0

Estado: Final

Tipo de recurso: Article  -  PeerReviewed  - 

Tipo de Interactividad: Expositivo

Nivel de Interactividad: muy bajo

Audiencia: Estudiante  -  Profesor  -  Autor  - 

Estructura: Atomic

Coste: no

Copyright: sí

Requerimientos técnicos:  Browser: Any - 

Relación: [References] http://resolver.caltech.edu/CaltechAUTHORS:20180112-100116271
[References] https://authors.library.caltech.edu/84297/

Fecha de contribución: 13-ene-2018

Contacto:

Localización:
* Callies, Jörn and Flierl, Glenn and Ferrari, Raffaele and Fox-Kemper, Baylor (2016) The role of mixed-layer instabilities in submesoscale turbulence. Journal of Fluid Mechanics, 788 . pp. 5-41. ISSN 0022-1120. http://resolver.caltech.edu/CaltechAUTHORS:20180112-100116271

Otros recursos de la mismacolección

  1. The Gaia-ESO Survey and CSI 2264: Substructures, disks, and sequential star formation in the young open cluster NGC 2264 Context. Reconstructing the structure and history of young clusters is pivotal to understanding the ...
  2. The Dynamics of Mesoscale Winds in the Upper Troposphere and Lower Stratosphere Spectral analysis is applied to infer the dynamics of mesoscale winds from aircraft observations in ...
  3. Baroclinic Instability in the Presence of Convection Baroclinic mixed-layer instabilities have recently been recognized as an important source of submeso...
  4. Seasonality in submesoscale turbulence Although the strongest ocean surface currents occur at horizontal scales of order 100 km, recent num...
  5. Wave–vortex decomposition of one-dimensional ship-track data We present a simple two-step method by which one-dimensional spectra of horizontal velocity and buoy...

Aviso de cookies: Usamos cookies propias y de terceros para mejorar nuestros servicios, para análisis estadístico y para mostrarle publicidad. Si continua navegando consideramos que acepta su uso en los términos establecidos en la Política de cookies.