HR: 14:20h
AN: OS13C-03    [Abstracts]
TI: Observations of shoaling internal tidal waves during NCEX
AU: * Lentz, S J
EM: slentz@whoi.edu
AF: Woods Hole Oceanographic Institution, MS #21, Woods Hole, MA 02543 United States
AU: Herbers, T
EM: thherber@nps.navy.mil
AF: Naval Postgraduate School, Department of Oceanography, Monterey, CA 93943 United States
AU: O'Reilly, W
EM: bor@coast.ucsd.edu
AF: University of California, Berkeley, Department of Civil and Environmental Engineering, Berkeley, CA 94720 United States
AU: Jessen, P
EM: pfjessen@nps.navy.mil
AF: Naval Postgraduate School, Department of Oceanography, Monterey, CA 93943 United States
AU: Kirk, M
EM: mkirk@ucsd.edu
AF: Scripps Institution of Oceanography, 9500 Gilman Dr, La Jolla, CA 90293 United States
AU: Elgar, S
EM: elgar@whoi.edu
AF: Woods Hole Oceanographic Institution, MS #21, Woods Hole, MA 02543 United States
AU: Guza, R
EM: rtg@coast.ucsd.edu
AF: Scripps Institution of Oceanography, 9500 Gilman Dr, La Jolla, CA 90293 United States
AB: Energetic semidiurnal internal waves are evident in moored current and temperature observations obtained from September to December 2003 on the southern California shelf near Scripps Canyon as part of the Nearshore Canyon Experiment. Isotherm displacements of 10 m or more in water depths of 20 m were common. Associated cross-shelf currents exhibited opposite flows in the upper and lower half of the water column (mode-1 vertical structure) with velocities of ~0.1 m/s. Alongshelf currents were uniform with depth (barotropic), also with velocities of ~0.1 m/s. The semidiurnal internal waves propagated onshore at speeds ranging from ~0.3 m/s when the stratification was strong in September to ~0.1 m/s when stratification was weaker in late November and early December. The internal tide shoals at an angle to the local isobaths, arriving at the 10-m isobath near Scripps Canyon 1-2 hours earlier than at a site 2 km to the north.
DE: 4219 Continental shelf processes
DE: 4544 Internal and inertial waves
DE: 4546 Nearshore processes
DE: 4560 Surface waves and tides (1255)
SC: Ocean Sciences [OS]
MN: 2004 AGU Fall Meeting