On the role of SAR for observing 'local generation' of internal solitary waves off the Iberian Peninsula

Da Silva, J.C.B.; New, A.L. ORCID:; Azevedo, A.. 2007 On the role of SAR for observing 'local generation' of internal solitary waves off the Iberian Peninsula. Canadian Journal of Remote Sensing, 33 (5). 388-403.

Full text not available from this repository.


Internal tides are well known to result from the interaction of the surface tide with steep sea-floor or shelf-break topography. Large-amplitude internal solitary waves (ISWs) have been observed occurring in packets in open ocean areas well away from such pronounced topography. The Bay of Biscay is a region where these waves could be generated “locally” by the reflection or scattering of an internal tidal beam from the near-surface thermocline. In this paper we investigate available ENVISAT ASAR and ERS SAR imagery to study the generation of ISWs in the southern Bay of Biscay (43–45°N, 7–10°W) and off the southwest Iberian Peninsula (37–39°N, 8.5–10.5°W). In the southern Bay of Biscay, image analyses have shown the presence of packets of ISWs propagating towards the north-northwest (in addition to the previously observed ISWs propagating towards the east-northeast) from the Cape Ortegal region off the northwest Iberian Peninsula. Furthermore, the imagery revealed, for the first time, evidence of “local generation” of ISWs off southwest Portugal, travelling both offshore (two sets of waves, generated after reflections of internal tidal rays from the sea floor) and onshore (one example, generated directly by an upward ray without a bottom reflection).

Item Type: Publication - Article
ISSN: 1712-7971
Date made live: 17 Jan 2008 +0 (UTC)

Actions (login required)

View Item View Item

Document Downloads

Downloads for past 30 days

Downloads per month over past year

More statistics for this item...