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The Evolution of Mode-2 Nonlinear Internal Waves Over the Northern Heng-chun Ridge South of Taiwan : Volume 2, Issue 1 (18/02/2015)

By Ramp, S. R.

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Book Id: WPLBN0004020135
Format Type: PDF Article :
File Size: Pages 54
Reproduction Date: 2015

Title: The Evolution of Mode-2 Nonlinear Internal Waves Over the Northern Heng-chun Ridge South of Taiwan : Volume 2, Issue 1 (18/02/2015)  
Author: Ramp, S. R.
Volume: Vol. 2, Issue 1
Language: English
Subject: Science, Nonlinear, Processes
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Copernicus GmbH
Publication Date:
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications


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Reeder, D. B., Buijsman, M. C., Yang, Y. J., Bahr, F. L., & Ramp, S. R. (2015). The Evolution of Mode-2 Nonlinear Internal Waves Over the Northern Heng-chun Ridge South of Taiwan : Volume 2, Issue 1 (18/02/2015). Retrieved from

Description: Soliton Ocean Services, Inc., Carmel Valley, CA 93924, USA. Two research cruises were conducted from the R/V OCEAN RESEARCHER 3 during 5–16 August 2011 to study the generation of high-frequency nonlinear internal waves (NLIW) over the northern Heng-Chun Ridge south of Taiwan. The primary study site, centered near 21°34' N, 120°54' E, was on top of a smaller ridge about 15 km wide by 400 m high atop the primary ridge, with a sill depth of approximately 600 m. The bottom slope was steep over both sides of the ridge, supercritical with respect to both diurnal and semidiurnal tides. The key result of the experiments is that a profusion of mode-2 NLIW were observed by all the sensors. Some of the waves were solitary while others had as many as seven evenly-spaced waves per packet. The waves all exhibited classic mode-2 velocity structure with a core near 150–200 m and opposing velocities in the layers above and below. At least two and possibly three most common propagation directions emerged from the analysis, suggesting multiple generation sites near the east side of the ridge. The turbulent dissipation due to overturns in the wave cores was very high at order 10−4–10−3 W kg−1. The energy budget suggests that the waves cannot persist very far from the ridge and likely do not contribute to the South China Sea transbasin wave phenomenon.

The evolution of Mode-2 nonlinear internal waves over the northern Heng-Chun ridge south of Taiwan

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