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Lien, R.-C., and M. C. Gregg (2001), Observations of turbulence in a tidal beam and across a coastal ridge, J. Geophys. Res., 106, 4575-4591.

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Presentation on theme: "Lien, R.-C., and M. C. Gregg (2001), Observations of turbulence in a tidal beam and across a coastal ridge, J. Geophys. Res., 106, 4575-4591."— Presentation transcript:

1 Lien, R.-C., and M. C. Gregg (2001), Observations of turbulence in a tidal beam and across a coastal ridge, J. Geophys. Res., 106, 4575-4591.

2 http://www.es.flinders.edu.au/~mattom/Int roOc/notes/figures/fig10a7.html

3 Overview of a soliton surge through the Strait of Gibraltar into the Alboran Sea. Once a day the high tide produces sufficient energy to create solitons atop the strong density boundary between the dense bottom water flowing west into the Atlantic Ocean and the less dense water flowing into the Mediterranean from the Atlantic. Space Shuttle Flight 41G; 36N, 5.5W, 12:04:04 GMT, 11 Oct 1984

4 Energetic solitons generated near the shelf break propagated shoreward past FLIP, which was tri-moored in 150m of water. Extremely nonlinear solitons, with downward displacements of 25m from a 7m pycnocline depth were observed on the leading edge of the semidiurnal internal tide. Observation of the upper ocean near the shelf break off northern Oregon made from FLIP in Oct. 1995. >18000 profiles of T, S, and thermal and kinetic energy dissipation rates were measured by an automated Loose-tethered Microstructure Profiler every 80 s.

5 S07-05-245 Flight STS-7; 18.5N, 111.5E, 23 June 1983 4 sets of such internal waves observed by the Challenger's crew as they orbited over Hainan Island and the South China Sea. The waves, each representing a high tide of the diurnal tidal cycle.

6 Stack plot of T at mooring S7 on the 350 m isobath. The bottom 150 m are not shown to allow a clearer presentation of the internal wave structure. Each panel is one day (May 4 – 14, 2001) from 0000 to 2400 hours. Ramp et al., 2003

7 350 m 200 m 120 m ASIAEX Temperature May 6, 2001 Wave Evolution Towards Shallower Water S7 S5 S4 120 200 350 wave N W E S Hours on May 6 (GMT) °C°C Ramp et al., 2003

8 T and w (top panel), and u (bottom panel) for the May 8 soliton packet observed at ASIAEX mooring S7 on the 350 m isobath. w, white line, was sampled by the 90- m ADCP range cell, one of the closest bins to the transducer heads. The upper layer horizontal velocities are from the ADCP and the lower layer velocities are from the three Aanderaa current meters. Ramp et al., 2003

9 Observed and PCTides-generated barotropic tidal amplitudes at S7 on the Chinese continental slope. Middle: The barotropic tidal height in Luzon Strait, as computed by the global tidal model PCTides. Top: T at 140 m at site S7 on the 350 m isobath, phase-shifted 3.7 days to the left (earlier) to account for the propagation time between the proposed generation site (Luzon Strait) and the mooring. All the pressure time series had the mean removed, were scaled up by a factor of 10, and were offset by 15 and 30 db, respectively for clarity. Ramp et al., 2003


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