Physics
Scientific paper
Aug 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010georl..3716603v&link_type=abstract
Geophysical Research Letters, Volume 37, Issue 16, CiteID L16603
Physics
1
Oceanography: General: Benthic Boundary Layers, Oceanography: General: Marginal And Semi-Enclosed Seas, Oceanography: Physical: Turbulence, Diffusion, And Mixing Processes (4490)
Scientific paper
Large vertical temperature differences up to 3°C m-1 are observed very near (<0.5 m from) the 2-m sand-waves bottom in a 20-25 m deep sea strait dominated by tidal flows >1 m s-1. The upper sensor at 0.42 m above the bottom (mab) follows typical temperature variations higher up in the water column, being -90° out-of-phase with the main along-channel current. In contrast, the lower sensor at 0.08 mab is approximately +30-50° more in-phase with the free-stream current. The data confirm the mechanism of “tidal straining”, but much closer to the bottom than previously observed and in a 3-D version with cross-flow influences. In this mechanism, turbulent shear flow and horizontal density gradients create stable stratification during ebb and unstable conditions during flood. Here, stratification provides a slippery boundary flow-condition and periodic support of short-scale internal waves with periods down to 50 s.
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