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Turbulence and high-frequency variability in a deep gravity current outflow

AutorNash, Jonathan D.; Peters, H.; Kelly, Samuel M.; Pelegrí, Josep Lluís ; Emelianov, Mikhail ; Gasser, Marc
Palabras claveInternal waves
Gravity currents
Deep outflows
Fecha de publicaciónsep-2012
EditorAmerican Geophysical Union
CitaciónGeophysical Research Letters 39(18): L18611 (2012)
ResumenIntensive sampling of the deep Mediterranean outflow 70 km W of the Strait of Gibraltar reveals a strong, tidally modulated gravity current embedded with large-amplitude oscillations and energetic turbulence. The flow appears to be hydraulically controlled at a small topographic constriction, with turbulence and internal waves varying together and increasing dramatically downstream of the choke point. These data suggest that a significant fraction of energy dissipation, mixing, and entrainment stress in gravity currents may occur in localized regions controlled by time-varying flow interactions with fine-scale topography. These findings highlight the important role of processes that are not resolved by global climate models (GCMs), which do not contain tides or mixing due to fine-scale topographic interactions. © 2012. American Geophysical Union. All Rights Reserved
Descripción6 pages, 4 figures
Versión del editorhttp://dx.doi.org/10.1029/2012GL052899
Identificadoresdoi: 10.1029/2012GL052899
issn: 0094-8276
e-issn: 1944-8007
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