TitleSeismic imaging of staircase layers below the Mediterranean Undercurrent
Publication TypeJournal Article
Year of Publication2010
AuthorsBiescas B, Armi L, Sallares V, Grácia E
JournalDeep Sea Research Part I: Oceanographic Research Papers
Date Publishedoct
KeywordsBoundary mixing, Gulf of Cadiz, Meddy, Mediterranean Undercurrent, Seismic oceanography, Thermohaline staircase layers
AbstractSeismic images of staircase layers at the bottom of the Mediterranean Undercurrent with a lateral coherence up to 50. km and a horizontal resolution of \~{}10m are presented. The images show clearly the interaction between these staircase layers and other flow structures such as meddies, seamounts and internal waves. The staircase layers were imaged during two different surveys that used different sound sources. Comparison between seismic images and historical oceanographic observations illustrates the importance of using a seismic source adapted to the vertical scale of the oceanographic target to be imaged. Wavelengths larger than the size of the staircase structure distort the image in the vertical. For optimal imaging, deconvolution of the data is required. © 2010 Elsevier Ltd.