Effects of Kuroshio intrusions on nonlinear internal waves in the South China Sea during winter SCIE SCOPUS

Cited 42 time in WEB OF SCIENCE Cited 45 time in Scopus
Title
Effects of Kuroshio intrusions on nonlinear internal waves in the South China Sea during winter
Author(s)
Park, Jae-Hun; Farmer, David
Alternative Author(s)
박재훈
Publication Year
2013-12
Abstract
During winter the Kuroshio tends to cross Luzon Strait, penetrating the northeastern South China Sea where it forms energetic mesoscale structures. Luzon Strait is also a site where westward-propagating large-amplitude internal waves are generated. We describe observations of these waves acquired in the deep basin of the South China Sea during the winter of 2010-2011, with the goal of assessing the influence of mesoscale variability on their properties. Combining tidal current simulations with an internal wave generation and evolution model, we obtain time series of deviations between our observations and the model simulations. These deviations are analyzed in terms of mesoscale variability based on the data-assimilated HYbrid Coordinate Ocean Model (HYCOM) simulations. We find that simplified models of nonlinear internal wave response to changes in horizontal stratification gradients and vertical shear provide at best weak simulations of amplitude modulation. In contrast to these results, deviations of internal wave arrival time, occurring up to 2 h early during Kuroshio inflows, are quite well simulated when derived from integration of the first internal mode phase speed along two-dimensional ray-traced paths using HYCOM simulations of velocity and density fields together with bathymetry. Refraction of the internal waves by Kuroshio intrusions can lead to substantial distortion of the paths, sufficient to provide a potential explanation for the apparent suppression of waves during previous winter measurements. Our results suggest that the internal wave field can be a sensitive indicator of mesoscale variability in Luzon Strait and the northeastern South China Sea.
ISSN
0148-0227
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/3057
DOI
10.1002/2013JC008983
Bibliographic Citation
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS, v.118, no.12, pp.7081 - 7094, 2013
Publisher
AMER GEOPHYSICAL UNION
Keywords
nonlinear internal wave; South China Sea; inverted echo sounder; Kuroshio
Type
Article
Language
English
Document Type
Article
Publisher
AMER GEOPHYSICAL UNION
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