Significant internal waves and internal tides measured northeast of Taiwan

Timothy F. Duda, Arthur E. Newhall, Glen Gawarkiewicz, Michael J. Caruso, Hans C Graber, Yiing Jang Yang, Sen Jan

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

Internal gravity waves in an area northeast of Taiwan are characterized using data from multiple sensor types. The data set includes intermittent information collected from a ship and short time series from moorings. Modeled nonlinear waves are fitted to observed nonlinear waves to provide selfconsistent estimates of multiple wave parameters. A nonlinear internal wave of over 50 m amplitude, observed in deep water, is examined in detail. This wave was moving northward from the southern Okinawa Trough toward the continental shelf, and presumably formed from internal tides propagating northward from the Ilan Ridge area. A possible scenario for the formation of this wave from the internal tide is compared to related behavior south of Taiwan. On the outer continental shelf, a few large internal waves with maximum displacement greater than one-quarter of the water depth were measured with moorings. Sensors aboard ship and satellite recorded waves in this area traveling in many directions. Two possible causes (not mutually exclusive) for the multiple wave directions are scattering of nonlinear internal waves arriving from the south, and variable local generation of nonlinear gravity waves by the strong tidal and internal tidal currents. Internal tides on the shelf are relatively strong, among the strongest measured, having about 10 times greater kinetic energy density than numerous low-energy sites, which is consistent with the strong barotropic tides of the area. The ratio of diurnal baroclinic to barotropic kinetic energy found in this area is unusually high.

Original languageEnglish (US)
Pages (from-to)47-82
Number of pages36
JournalJournal of Marine Research
Volume71
Issue number1-2
StatePublished - Jan 2013

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internal tide
nonlinear wave
internal wave
gravity wave
kinetic energy
continental shelf
barotropic tide
sensor
wave direction
tidal current
water depth
trough
deep water
scattering
time series
energy

ASJC Scopus subject areas

  • Oceanography

Cite this

Duda, T. F., Newhall, A. E., Gawarkiewicz, G., Caruso, M. J., Graber, H. C., Yang, Y. J., & Jan, S. (2013). Significant internal waves and internal tides measured northeast of Taiwan. Journal of Marine Research, 71(1-2), 47-82.

Significant internal waves and internal tides measured northeast of Taiwan. / Duda, Timothy F.; Newhall, Arthur E.; Gawarkiewicz, Glen; Caruso, Michael J.; Graber, Hans C; Yang, Yiing Jang; Jan, Sen.

In: Journal of Marine Research, Vol. 71, No. 1-2, 01.2013, p. 47-82.

Research output: Contribution to journalArticle

Duda, TF, Newhall, AE, Gawarkiewicz, G, Caruso, MJ, Graber, HC, Yang, YJ & Jan, S 2013, 'Significant internal waves and internal tides measured northeast of Taiwan', Journal of Marine Research, vol. 71, no. 1-2, pp. 47-82.
Duda TF, Newhall AE, Gawarkiewicz G, Caruso MJ, Graber HC, Yang YJ et al. Significant internal waves and internal tides measured northeast of Taiwan. Journal of Marine Research. 2013 Jan;71(1-2):47-82.
Duda, Timothy F. ; Newhall, Arthur E. ; Gawarkiewicz, Glen ; Caruso, Michael J. ; Graber, Hans C ; Yang, Yiing Jang ; Jan, Sen. / Significant internal waves and internal tides measured northeast of Taiwan. In: Journal of Marine Research. 2013 ; Vol. 71, No. 1-2. pp. 47-82.
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