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On the detectability of internal waves by an imaging lidar
Magalhaes, J.M.; da Silva, J.C.B.; Batista, M.; Gostiaux, L.; Gerkema, T.; New, A.L.; Jeans, D.R.G. (2013). On the detectability of internal waves by an imaging lidar. Geophys. Res. Lett. 40(13): 3429–3434. hdl.handle.net/10.1002/grl.50669
In: Geophysical Research Letters. American Geophysical Union: Washington. ISSN 0094-8276, more
Peer reviewed article  

Available in  Authors 

Author keywords
    internal solitary waves; lidar; oceanography; surfactants; foam lines; bubbles

Authors  Top 
  • Magalhaes, J.M.
  • da Silva, J.C.B.
  • Batista, M.
  • Gostiaux, L.
  • Gerkema, T., more
  • New, A.L.
  • Jeans, D.R.G.

Abstract
    The first results of a multisensor airborne survey conducted off the western Iberian Coast are presented (including visible, lidar, and infrared imagery) and reveal the presence of internal solitary waves (ISWs) propagating into the nearshore region. For the first time, two-dimensional lidar imagery is shown to detect the presence of ISWs, and the results are interpreted in a more comprehensive framework provided by the remaining instrumentation. Sea surface roughness patterns, resulting from the ISWs, are found to be imaged in the lidar data, where specular reflection causes slicks to appear as areas of significantly reduced backscatter. Moreover, the lidar data reveal an unprecedented view into the ISW surface and subsurface structures. Possible interpretations are discussed based on the accumulation of surfactants and air bubble entrainment at the leading edge of the ISWs (where maximum convergence occurs).

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