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1 November 2013 Observations of High-Frequency Internal Waves in the Southern Taiwan Strait
Xiaolin Bai, Zhiyu Liu, Xiaofeng Li, Zhaozhang Chen, Jianyu Hu, Zhenyu Sun, Jia Zhu
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Abstract

Bai, X.; Liu, Z.; Li, X.; Chen, Z.; Hu, J.; Sun, Z.; and Zhu, J., 2013. Observations of high-frequency internal waves in the southern Taiwan Strait.

Based on in situ hydrographic measurements at a station at about 60 m depth near the local shelf break in July 2011 and a satellite image of the sea-surface roughness, we present the evidence of existence and characteristics of high-frequency internal waves (HIWs) in the southern Taiwan Strait. Variations of the thermohaline structure at the observational site were revealed by repeating conductivity-temperature-depth (CTD) profiling measurements of every 2 hours, while fluctuations of the isothermals due to the passage of HIWs were recorded by continuous CTD measurements with a probe positioned approximately in the middle of the pycnocline. A fast sampling frequency of 8 Hz allows the structure of the HIWs to be captured in great detail. The waves were depression waves, with a period of about 6.2 min and an amplitude of about 25 m. The propagation speed of the waves is estimated to be 0.56 m/s by solving the KdV equation with the observed background stratification. The frequent occurrence of HIWs in the Taiwan Strait is evidenced by the analysis of a MODIS true color image of the sea-surface roughness. The possible generation mechanism of the HIWs is discussed based on a MODIS image and the perturbed KdV equation.

Xiaolin Bai, Zhiyu Liu, Xiaofeng Li, Zhaozhang Chen, Jianyu Hu, Zhenyu Sun, and Jia Zhu "Observations of High-Frequency Internal Waves in the Southern Taiwan Strait," Journal of Coastal Research 29(6), 1413-1419, (1 November 2013). https://doi.org/10.2112/JCOASTRES-D-12-00141.1
Received: 19 July 2012; Accepted: 30 December 2012; Published: 1 November 2013
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KEYWORDS
CTD data
High-frequency internal waves
internal tide
MODIS true color image
perturbed KdV equation
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