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

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  • Intensive 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.
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  • Nash, J. D., H. Peters, S. M. Kelly, J. L. Pelegrí, M. Emelianov, and M. Gasser (2012), Turbulence and high-frequency variability in a deep gravity current outflow, Geophysical Research Letters, 39, L18611, doi:10.1029/2012GL052899.
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  • description.provenance : Submitted by Deanne Bruner (deanne.bruner@oregonstate.edu) on 2012-11-14T22:05:17Z No. of bitstreams: 1 NashJonathanCEOASTurbulenceHighFrequency.pdf: 1194690 bytes, checksum: c57cee0370fdddfa0b19bb8bc7f58fcb (MD5)
  • description.provenance : Made available in DSpace on 2012-11-14T22:05:17Z (GMT). No. of bitstreams: 1 NashJonathanCEOASTurbulenceHighFrequency.pdf: 1194690 bytes, checksum: c57cee0370fdddfa0b19bb8bc7f58fcb (MD5) Previous issue date: 2012-09-28

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