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High-resolution structure of the upper Western Boundary Undercurrent core shaping the Eirik Drift
Uenzelmann-Neben, G.; Müller-Michaelis, A. (2014). High-resolution structure of the upper Western Boundary Undercurrent core shaping the Eirik Drift, in: Van Rooij, D. et al. (Ed.) Book of Abstracts. 2nd Deep-Water Circulation Congress: The Contourite Log-book. Ghent, Belgium, 10-12 September 2014. VLIZ Special Publication, 69: pp. 37-38
In: Van Rooij, D.; Rüggeberg, A. (Ed.) (2014). Book of Abstracts. 2nd Deep-Water Circulation Congress: The Contourite Log-book. Ghent, Belgium, 10-12 September 2014. VLIZ Special Publication, 69. Ghent University, Department of Geology and Soil Science/Flanders Marine Institute (VLIZ): Oostende. xviii, 152 pp., more
In: VLIZ Special Publication. Vlaams Instituut voor de Zee (VLIZ): Oostende. ISSN 1377-0950, more

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Keywords
Author keywords
    Western Boundary Undercurrent (WBUC); Seismic oceanography; Eirik Drift;

Authors  Top 
  • Uenzelmann-Neben, G.
  • Müller-Michaelis, A.

Abstract
    For the first time the method of seismic oceanography was applied to identify fine structure of a water mass in greater depths (> 1500m) close to the seafloor. The pathway of the upper high-velocity Western Boundary Undercurrent (WBUC) branch was tracked over the Eirik Drift, 200km south of Greenland at seafloor depths between ~2200 and 3000m. It appears as an upward convex structure attached to the slope with a transparent, i.e. well mixed, core surrounded by higher amplitude reflections. These reflect gradients and fine structure. Fine structure is a result of enhanced mixing processes, presumably due to entrainment of surrounding water of less momentum by the intensified deep current core. We show that this new information about structure and pathways of the WBUC could not have been gained by conventional oceanographic measurements alone.

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