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contributor authorLi, Qiang
contributor authorFarmer, David M.
date accessioned2017-06-09T16:40:51Z
date available2017-06-09T16:40:51Z
date copyright2011/07/01
date issued2011
identifier issn0022-3670
identifier otherams-72100.pdf
identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4214065
description abstractime series observations of nonlinear internal waves in the deep basin of the South China Sea are used to evaluate mechanisms for their generation and evolution. Internal tides are generated by tidal currents over ridges in Luzon Strait and steepen as they travel west, subsequently generating high-frequency nonlinear waves. Although nonlinear internal waves appear repeatedly on the western slopes of the South China Sea, their appearance in the deep basin is intermittent and more closely related to the amplitude of the semidiurnal than the predominant diurnal tidal current in Luzon Strait. As the internal tide propagates westward, it evolves under the influence of nonlinearity, rotation, and nonhydrostatic dispersion. The interaction between nonlinearity and rotation transforms the internal tide into a parabolic or corner shape. A fully nonlinear two-layer internal wave model explains the observed characteristics of internal tide evolution in the deep basin for different representative forcing conditions and allows assessment of differences between the fully and weakly nonlinear descriptions. Matching this model to a wave generation solution for representative topography in Luzon Strait leads to predictions in the deep basin consistent with observations. Separation of the eastern and western ridges is close to the internal semidiurnal tidal wavelength, contributing to intensification of the westward propagating semidiurnal component. Doppler effects of internal tide generation, when combined with a steady background flow, suggest an explanation for the apparent suppression of nonlinear wave generation during periods of westward intrusion of the Kuroshio.
publisherAmerican Meteorological Society
titleThe Generation and Evolution of Nonlinear Internal Waves in the Deep Basin of the South China Sea
typeJournal Paper
journal volume41
journal issue7
journal titleJournal of Physical Oceanography
identifier doi10.1175/2011JPO4587.1
journal fristpage1345
journal lastpage1363
treeJournal of Physical Oceanography:;2011:;Volume( 041 ):;issue: 007
contenttypeFulltext


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