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Internal solitary waves in the Mozambique Channel: Observations and interpretation

Internal solitary waves in the Mozambique Channel: Observations and interpretation
Internal solitary waves in the Mozambique Channel: Observations and interpretation
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.
0148-0227
C05001
da Silva, J.C.B.
f0299437-57df-41b7-a0fd-520aa8d0a319
New, A.L.
69c2be8b-c6c2-408f-9612-6980b1a25802
Magalhaes, J.M.
6697555b-9ff9-4411-9ace-51e28d67c9b1
da Silva, J.C.B.
f0299437-57df-41b7-a0fd-520aa8d0a319
New, A.L.
69c2be8b-c6c2-408f-9612-6980b1a25802
Magalhaes, J.M.
6697555b-9ff9-4411-9ace-51e28d67c9b1

da Silva, J.C.B., New, A.L. and Magalhaes, J.M. (2009) Internal solitary waves in the Mozambique Channel: Observations and interpretation. Journal of Geophysical Research, 114 (C5), C05001. (doi:10.1029/2008JC005125).

Record type: Article

Abstract

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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Published date: 1 May 2009

Identifiers

Local EPrints ID: 66967
URI: http://eprints.soton.ac.uk/id/eprint/66967
ISSN: 0148-0227
PURE UUID: 1b6b6721-155d-47ff-bd2c-6632f3ae623b

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Date deposited: 29 Jul 2009
Last modified: 26 Oct 2023 06:09

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Contributors

Author: J.C.B. da Silva
Author: A.L. New
Author: J.M. Magalhaes

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