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| Titel |
The evolution of Mode-2 nonlinear internal waves over the northern Heng-Chun ridge south of Taiwan |
| VerfasserIn |
S. R. Ramp, Y. J. Yang, D. B. Reeder, M. C. Buijsman, F. L. Bahr |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
2198-5634
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| Digitales Dokument |
URL |
| Erschienen |
In: Nonlinear Processes in Geophysics Discussions ; 2, no. 1 ; Nr. 2, no. 1 (2015-02-18), S.243-296 |
| Datensatznummer |
250115148
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| Publikation (Nr.) |
 copernicus.org/npgd-2-243-2015.pdf |
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| Zusammenfassung |
| 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. |
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