Cyclones and Anticyclones in Seismic Imaging

A.C. Barbosa Aguiar 1 C. Ménesguen 2 S. Le Gentil 2 R. Schopp 2 Xavier J. Carton 2
1 Instituto Dom Luiz
2 LPO - Laboratoire de physique des océans
Abstract : Nearly all the subsurface eddies detected in seismic imaging of sections in the northeast Atlantic have been assumed to be anticyclones containing Mediterranean Water (MW). Fewer MW cyclones have been observed and studied. In this study, the work of previous numerical studies is extended to investigate some characteristics of layering surrounding MW cyclones, using a primitive equation model with equal diffusivities for salinity and temperature to suppress the effects of double diffusion. It is shown that, after a stable state is reached, both anticyclones and cyclones display similar patterns of layering: stacked thin layers of high acoustic reflectivity located above and below the core of each vortex, which do not match isopycnals. The authors conclude that it should not be possible to distinguish between MW cyclones and anticyclones based on their signature in seismic imaging alone. Complementary information is needed to determine the sense of rotation.
Keywords : Geographic location/entity North Atlantic Ocean Circulation/ Dynamics Small scale processes Atm/Ocean Structure/ Phenomena Eddies Vortices Observational techniques and algorithms Acoustic measurements/effects Models and modeling Primitive equations model
Type de document :
Article dans une revue
Journal of Physical Oceanography, American Meteorological Society, 2015, 45 (9), pp.2436-2443. 〈10.1175/JPO-D-15-0066.1〉
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http://hal.univ-brest.fr/hal-01494997
Contributeur : Francoise Cudennec <>
Soumis le : vendredi 24 mars 2017 - 13:22:13
Dernière modification le : jeudi 11 janvier 2018 - 06:17:08

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A.C. Barbosa Aguiar, C. Ménesguen, S. Le Gentil, R. Schopp, Xavier J. Carton. Cyclones and Anticyclones in Seismic Imaging . Journal of Physical Oceanography, American Meteorological Society, 2015, 45 (9), pp.2436-2443. 〈10.1175/JPO-D-15-0066.1〉. 〈hal-01494997〉

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