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Surface Signature of Mediterranean Water Eddies in the North-east Atlantic: Effect of the Upper Ocean Stratification : Volume 9, Issue 4 (20/07/2012)

By Bashmachnikov, I.

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Book Id: WPLBN0003978478
Format Type: PDF Article :
File Size: Pages 35
Reproduction Date: 2015

Title: Surface Signature of Mediterranean Water Eddies in the North-east Atlantic: Effect of the Upper Ocean Stratification : Volume 9, Issue 4 (20/07/2012)  
Author: Bashmachnikov, I.
Volume: Vol. 9, Issue 4
Language: English
Subject: Science, Ocean, Science
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Historic
Publication Date:
2012
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

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Bashmachnikov, I., & Carton, X. (2012). Surface Signature of Mediterranean Water Eddies in the North-east Atlantic: Effect of the Upper Ocean Stratification : Volume 9, Issue 4 (20/07/2012). Retrieved from http://www.ebooklibrary.org/


Description
Description: Institute of Oceanography of the Faculty of Sciences of the University of Lisbon (OI-FCUL), Campo Grande, 1749-016, Lisbon, Portugal. Meddies, intra-thermocline eddies of Mediterranean water, are often visible at the sea surface as positive sea-level anomalies. Here we study the surface signature of several meddies tracked with RAFOS floats and AVISO altimetry. Then, theoretical estimates of the surface signature of a meddy are derived, based on geostrophy and potential vorticity balance. The intensity of the surface signature is proportional to the meddy core radius and to the Coriolis parameter, and inversely proportional to the core depth and buoyancy frequency. This indicates that surface signature of a meddy may be strongly reduced by the upper ocean stratification. Estimates suggest that the southernmost limit for detection in altimetry of small meddies (with radii on the order of 15 km) should lie in the northern subtropics, while large meddies (with radii of 25–30 km) could be detected as far south as the northern tropics. During the initial period of meddy acceleration after meddy formation or a stagnation stage, a cyclonic signal also is generated at the sea-surface, but mostly the anticyclonic surface signal follows the meddy.

Summary
Surface signature of Mediterranean water eddies in the North-East Atlantic: effect of the upper ocean stratification

Excerpt
Aiki, H. and Yamagata, T.: A numerical study on the successive formation of meddy-like lenses, J. Geophys. Res., 109, C06020, doi:10.1029/2003JC001952, 2004.; Armi, L., Hebert, D., Oakey, N., Price, J. F., Richardson, P. L., Rossby, H. T., and Ruddick, B.: The history and decay of a Mediterranean salt lens, Nature, 333, 649–651, 1988.; Armi, L., Hebert, D., Oakey, N., Price, J. F., Richardson, P. L., Rossby, H. T., and Ruddick, B.: Two years in the life of a Mediterranean salt lens, J. Phys. Oceanogr., 19, 354–370, 1989.; Assenbaum, M. and Reverdin, G.: Near real-time analyses of the mesoscale circulation during the POMME experiment, Deep-Sea Res. Pt. I, 52, 1345–1373, 2005.; AVISO altimeter products, produced by Ssalto/Duacs and distributed by Aviso, with support from CNES, available at: http://www.aviso.oceanobs.com, last access: 1 November 2011.; Bashmachnikov, I., Machin, F., Mendonca, A., and Martins, A.: In-situ and remote sensing signature of meddies east of the Mid-Atlantic ridge, J. Geophys. Res., 114, C05018, doi:10.1029/2008JC005032, 2009a.; Pingree, R. D. and Le Cann, B.: Structure of a meddy (Bobby 92) southeast of the Azores, Deep-Sea Res. Pt. I, 40, 2077–2103, 1993a.; Bashmachnikov, I., Mohn, C., Pelegrí, J. L., Martins, A., Machín, F., Jose, F., and White, M.: Interaction of Mediterranean water eddies with Sedlo and Seine seamounts, Subtropical Northeast Atlantic, Deep-Sea Res. Pt. II, 56, 2593–2605, 2009b.; Bashmachnikov, I., Boutov, D., Dias, J., Aguiar, A., and Monteiro, J. H.: Surface signature of a meddy while interacting with the Azores current, in: Geophysical Research Abstracts, Vol. 14, EGU General Assembly, Vienna, Austria, 24–27 April 2012, EGU2012-6152-1, 2012.; Bower, A. S., Armi, L., and Ambar, I.: Lagrangian observations of meddy formation during a Mediterranean undercurrent seeding experiment, J. Phys. Oceanogr., 27, 2545–2575, 1997.; Carton, X. J., Flierl, G. R., and Polvani, L. M.: The generation of tripoles from unstable axisymmetric isolated vortex structures, Europhys. Lett., 9, 339–344, 1989.; Carton, X. J., Cherubin, L., Paillet, J., Morel, Y., Serpette, A., and Le Cann, B.: Meddy coupling with deep cyclone in the gulf of Cadiz, J. Marine Syst., 32, 13–42, 2002.; Carton, X. J., Daniault, N., Alves, J., Cherubin, L., and Ambar, I.: Meddy dynamics and interaction with neighboring eddies southwest of Portugal: observations and modelling, J. Geophys. Res., 115, C06017, doi:10.1029/2009JC005646, 2010.; Flierl, G. R.: Particle motions in large-amplitude wave fields, Geophys. Astro. Fluid, 18, 39–74, 1981.; Flierl, G. R.: Rossby-wave radiation from a strongly nonlinear warm eddy, J. Phys. Oceanogr., 14, 47–58, 1984.; Hebert, D. L.: A Mediterranean Salt Lens, Ph. D. thesis, Dalhousie University, Halifax, Nova Scotia, 187 pp., 1988.; Hebert, D., Oakey, N., and Ruddick, B.: Evolution of a Mediterranean salt lens: scalar properti

 

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