“Hot spots” in the field of internal waves in the ocean

Sabinin, K. D.; Serebryany, A. N.

doi:10.1134/s1063771007030128

Cited by 34 publications

(19 citation statements)

References 26 publications

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“…It is likely that this would act (through internal wave‐current interaction) to reduce the wavelengths of the individual waves in the most offshore wave packet, as well as reducing the interpacket spacings between packets B and C, and between packets C and that farther offshore. Similar effects on ISWs have been observed by Sabinin and Serebryanyi [2007]. Overall, we therefore interpret these wave packets (A, B, C and that farther offshore) as resulting from direct generation at the shelf break on successive tidal cycles.…”

Section: Discussionsupporting

confidence: 81%

Internal solitary waves in the Mozambique Channel: Observations and interpretation

Silva¹,

New²,

Magalhaes³

2009

J. Geophys. Res.

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[1] This paper presents new results showing that the Sofala shelf in the Mozambique Channel (20°S, 36°E) is a previously unknown ''hot spot'' for the generation of internal tides and internal waves. We investigate available Envisat advanced synthetic aperture radar imagery of the region, which is capable of showing the surface signatures of the internal waves. This is complemented by modeling of the ray pathways of internal tidal energy propagation, and of the P. G. Baines (1982) barotropic body force, which drives the generation of internal tides near the shelf break. The hot spot region is localized between 20°and 21°S because of the particular nature of the bathymetry there. Farther north and south, the forcing is reduced and insufficient to generate internal solitary waves in the synthetic aperture radar images. The analysis reveals two distinct types of internal wave trains that are observed traveling oceanward away from the shelf break, and we suggest that these result from direct generation at the shelf break and from ''local'' generation at about 80 km from the shelf break, respectively, because of the surfacing of internal tidal rays at the thermocline. Finally, we have investigated seasonal differences in the wave patterns, which penetrate more extensively into the channel during the southern summer and appear slightly farther to the south during the southern winter. We also conclude that the local generation process is more likely to occur during the winter when the stratification is reduced.

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Section: Discussionsupporting

confidence: 81%

Internal solitary waves in the Mozambique Channel: Observations and interpretation

Silva¹,

New²,

Magalhaes³

2009

J. Geophys. Res.

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“…The most common mechanism for their generation is associated with the interaction of the currents of the barotropic tide with the slopes of bottom topography, which leads to the excitation of internal waves with heights of several tens, and in some cases, hundreds of meters [Morozov, 1995[Morozov, , 2018. Propagation of internal tides often leads to the generation of large-amplitude high-frequency internal waves [Sabinin et al, 2004;Sabinin andSerebryany, 2005, 2007]. However, observations of internal waves at high latitudes are rare.…”

Section: Introductionmentioning

confidence: 99%

Tidal internal waves in the Bransfield Strait, Antarctica

Khimchenko¹,

Frey²,

Morozov³

2020

Russ. J. Earth Sci.

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Observations of tidal internal waves in the Bransfield Strait, Antarctica, are analyzed. The measurements were carried out for 14 days on a moored station equipped with five autonomous temperature and pressure sensors. Vertical displacements of temperature revealed that strong internal vertical oscillations up to 30-40 m are caused by the diurnal internal tide. The waves are forced due to the interaction of the barotropic tide with the bottom topography. The velocity ellipses of the barotropic tidal currents were estimated using the global tidal model.

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“…[7][8][9] They may steepen and form bores or degenerate into a packet of internal solitary waves (ISWs), which are considered to be important for mixing, 1,10,11 horizontal transport of water mass, [12][13][14] sediment transport, [15][16][17] and offshore structures and operations. 4,18 Nonlinear effects are essential in these deformation processes, 19,20 but topography can also play important roles. 21 Although weakly nonlinear theories with 1st-order topographic effects have been used to investigate these processes, [21][22][23] a theory with strong nonlinear and topographic effects is preferable, 24 for example, to understand the dynamics of large-amplitude internal waves on continental shelves.…”

Section: Introductionmentioning

confidence: 99%