Gravity wave-fine structure interactions: A reservoir of small-scale and large-scale turbulence energy
A direct numerical simulation of gravity wave – fine structure interactions is performed to evaluate the effects of such a superposition on instability and turbulence for fine structure shears and a gravity wave (GW) amplitude that are individually stable. The superposition leads to deformations of...
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| Veröffentlicht in: | Geophysical research letters 2009-10, Vol.36 (19), p.np-n/a |
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| creator | Fritts, David C. Wang, Ling Werne, Joe |
| description | A direct numerical simulation of gravity wave – fine structure interactions is performed to evaluate the effects of such a superposition on instability and turbulence for fine structure shears and a gravity wave (GW) amplitude that are individually stable. The superposition leads to deformations of the fine structure and GW fields that exhibit Kelvin‐Helmholtz (KH) shear instabilities and turbulence extending over more than 20 buoyancy periods. KH instabilities occur on multiple scales, deplete the kinetic energy of the initial fine structure, and yield a layering of the potential temperature field resembling “sheet and layer” structures observed in the oceans and the atmosphere. The interactions have a much smaller effect on the GW amplitude. Such interactions among GWs and fine structure are likely ubiquitous throughout the atmosphere and oceans and may account for sporadic bursts of turbulence and its persistence in regions of apparent static and dynamic stability (Ri > 1/4). |
| doi_str_mv | 10.1029/2009GL039501 |
| format | Article |
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Res. Lett</addtitle><description>A direct numerical simulation of gravity wave – fine structure interactions is performed to evaluate the effects of such a superposition on instability and turbulence for fine structure shears and a gravity wave (GW) amplitude that are individually stable. The superposition leads to deformations of the fine structure and GW fields that exhibit Kelvin‐Helmholtz (KH) shear instabilities and turbulence extending over more than 20 buoyancy periods. KH instabilities occur on multiple scales, deplete the kinetic energy of the initial fine structure, and yield a layering of the potential temperature field resembling “sheet and layer” structures observed in the oceans and the atmosphere. The interactions have a much smaller effect on the GW amplitude. 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Such interactions among GWs and fine structure are likely ubiquitous throughout the atmosphere and oceans and may account for sporadic bursts of turbulence and its persistence in regions of apparent static and dynamic stability (Ri > 1/4).</abstract><cop>Washington, DC</cop><pub>Blackwell Publishing Ltd</pub><doi>10.1029/2009GL039501</doi><tpages>6</tpages><oa>free_for_read</oa></addata></record> |
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| subjects | Acoustics Amplitudes Atmosphere Atmospheric boundary layer Atmospheric sciences Computational fluid dynamics Earth sciences Earth, ocean, space Exact sciences and technology Fine structure Fluid flow gravity wave-turbulence interactions Gravity waves Instability Kelvin-Helmholtz instability Kinetic energy Marine Mesoclimatology Oceans Turbulence Turbulent flow |
| title | Gravity wave-fine structure interactions: A reservoir of small-scale and large-scale turbulence energy |
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