Open AccessNonlinear internal waves in the South China Sea: Observation of the conversion of depression internal waves to elevation internal waves
Author(s) -
Orr Marshall H.,
Mignerey Peter C.
Publication year - 2003
Publication title -
journal of geophysical research: oceans
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.67
H-Index - 298
eISSN - 2156-2202
pISSN - 0148-0227
DOI - 10.1029/2001jc001163
Subject(s) - internal wave , dissipation , internal tide , continental shelf , geology , waveform , nonlinear system , amplitude , mechanics , physics , kinetic energy , geophysics , wave propagation , meteorology , optics , classical mechanics , oceanography , thermodynamics , quantum mechanics , voltage
The conversion of depression nonlinear internal solitons to elevation internal waves has been observed twice at the South China Sea continental shelf break. Shipboard X‐band radar, tow‐yo CTD, ADCP and high frequency acoustic flow visualization of the process are presented. The data focuses on up slope propagation of depression internal solitons from a water depth of ∼264 m to a water depth of ∼110 m. Dissipation by large amplitude shear instabilities was observed. The kinetic energy density was found to be a decreasing monotonic function of range with an energy dissipation rate coefficient of 0.063 km −1 . The rate of energy dissipation over the ∼16.5 km soliton propagation path was 0.17 W/m/m. Simple numerical models of the waveform evolution are qualitatively compared to the observations. The observations, extracted scale parameters and dissipation rates should be useful for testing a variety of evolution equation representations of internal soliton propagation.