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On the role of wind direction in ERS SAR signatures of internal waves on the Iberian shelf

On the role of wind direction in ERS SAR signatures of internal waves on the Iberian shelf
On the role of wind direction in ERS SAR signatures of internal waves on the Iberian shelf
The relationship between internal wave (IW) signatures in Synthetic Aperture Radar (SAR) images and wind velocity is investigated. The effect of the wind velocity relative to the IW propagation direction on the IW signature is studied by means of a defined signature mode parameter (Sm). Sm is the parameter that quantifies the signature of the IW intensity profile in relation to the mean backscatter of the image background.
A wind contrast model based on a simple first-order Bragg scattering theory is combined with hydrodynamic modulation theory to explain the modulation of IW signatures. It takes into account the modulation of short-scale surface waves by the effect of the relative variations of wind velocity and the surface currents generated by the IWs.
It is shown that the signature mode parameter increases with the angle between the wind velocity and the IW propagation direction so that IWs propagating against the wind direction are imaged mostly as positive sign signatures, while those propagating in the wind direction are mostly negative sign signatures.
INTERNAL WAVES, WIND SPEED, SYNTHETIC APERTURE RADAR
1741-7538
269-281
Araujo, I.B.
77fc4d95-a9ac-425c-a561-1bc7349a5ffb
Da Silva, J.C.B.
f0299437-57df-41b7-a0fd-520aa8d0a319
Ermakov, S.A.
49f9be61-d06c-4fce-80d0-50625d26e75e
Robinson, I.S.
548399f7-f9eb-41ea-a28d-a248d3011edc
Araujo, I.B.
77fc4d95-a9ac-425c-a561-1bc7349a5ffb
Da Silva, J.C.B.
f0299437-57df-41b7-a0fd-520aa8d0a319
Ermakov, S.A.
49f9be61-d06c-4fce-80d0-50625d26e75e
Robinson, I.S.
548399f7-f9eb-41ea-a28d-a248d3011edc

Araujo, I.B., Da Silva, J.C.B., Ermakov, S.A. and Robinson, I.S. (2002) On the role of wind direction in ERS SAR signatures of internal waves on the Iberian shelf. Journal of Atmosphere and Ocean Science, 8 (4), 269-281. (doi:10.1080/1023673021000028889).

Record type: Article

Abstract

The relationship between internal wave (IW) signatures in Synthetic Aperture Radar (SAR) images and wind velocity is investigated. The effect of the wind velocity relative to the IW propagation direction on the IW signature is studied by means of a defined signature mode parameter (Sm). Sm is the parameter that quantifies the signature of the IW intensity profile in relation to the mean backscatter of the image background.
A wind contrast model based on a simple first-order Bragg scattering theory is combined with hydrodynamic modulation theory to explain the modulation of IW signatures. It takes into account the modulation of short-scale surface waves by the effect of the relative variations of wind velocity and the surface currents generated by the IWs.
It is shown that the signature mode parameter increases with the angle between the wind velocity and the IW propagation direction so that IWs propagating against the wind direction are imaged mostly as positive sign signatures, while those propagating in the wind direction are mostly negative sign signatures.

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More information

Published date: 2002
Keywords: INTERNAL WAVES, WIND SPEED, SYNTHETIC APERTURE RADAR

Identifiers

Local EPrints ID: 6058
URI: http://eprints.soton.ac.uk/id/eprint/6058
ISSN: 1741-7538
PURE UUID: 21955037-7b87-4e80-940e-3a7bedcc8e58

Catalogue record

Date deposited: 10 Jun 2004
Last modified: 06 Oct 2020 23:42

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Contributors

Author: I.B. Araujo
Author: J.C.B. Da Silva
Author: S.A. Ermakov
Author: I.S. Robinson

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