World Library  


Add to Book Shelf
Flag as Inappropriate
Email this Book

A Lagrangian Approach to the Loop Current Eddy Separation : Volume 20, Issue 1 (23/01/2013)

By Andrade-canto, F.

Click here to view

Book Id: WPLBN0003990676
Format Type: PDF Article :
File Size: Pages 12
Reproduction Date: 2015

Title: A Lagrangian Approach to the Loop Current Eddy Separation : Volume 20, Issue 1 (23/01/2013)  
Author: Andrade-canto, F.
Volume: Vol. 20, Issue 1
Language: English
Subject: Science, Nonlinear, Processes
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Historic
Publication Date:
2013
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

Citation

APA MLA Chicago

Sheinbaum, J., Sansón, L. Z., & Andrade-Canto, F. (2013). A Lagrangian Approach to the Loop Current Eddy Separation : Volume 20, Issue 1 (23/01/2013). Retrieved from http://hawaiilibrary.net/


Description
Description: Departmento de Oceanografía Física, CICESE, Carretera Ensenada-Tijuana 3918, 22860 Ensenada, Baja California, México. Determining when and how a Loop Current eddy (LCE) in the Gulf of Mexico will finally separate is a difficult task, since several detachment re-attachment processes can occur during one of these events. Separation is usually defined based on snapshots of Eulerian fields such as sea surface height (SSH) but here we suggest that a Lagrangian view of the LCE separation process is more appropriate and objective. The basic idea is very simple: separation should be defined whenever water particles from the cyclonic side of the Loop Current move swiftly from the Yucatan Peninsula to the Florida Straits instead of penetrating into the NE Gulf of Mexico. The properties of backward-time finite time Lyapunov exponents (FTLE) computed from a numerical model of the Gulf of Mexico and Caribbean Sea are used to estimate the skeleton of flow and the structures involved in LCE detachment events. An Eulerian metric is defined, based on the slope of the strain direction of the instantaneous hyperbolic point of the Loop Current anticyclone that provides useful information to forecast final LCE detachments. We highlight cases in which an LCE separation metric based on SSH contours (Leben, 2005) suggests there is a separated LCE that later reattaches, whereas the slope method and FTLE structure indicate the eddy remains dynamically connected to the Loop Current during the process.

Summary
A Lagrangian approach to the Loop Current eddy separation

Excerpt
Debreu, L.: Raffinement adaptatif de maillage et méthode de zoom, Application aux modeles d'océan, Ph.D. thesis, Université Joseph Fourier, Grenoble, France, 2000.; Alvera-Azcarate, A., Barth, A., and Weisberg, R.: The surface circulation of the Caribbean Sea and the Gulf of Mexico as inferred from satellite altimetry, J. Phys. Oceanogr., 39, 640–657, 2009.; Athié, G., Candela, J., Sheinbaum, J., and Ochoa, J.: Preconditioning of the Loop Current behaviour by the Mexican Caribbean Circulation, J. Geophys. Res., 117, C03018, doi:10.1029/2011JC007090, 2011.; Beron-Vera, F., Olascoaga, M., and Goni, G.: Oceanic mesoscale eddies as revealed by Lagrangian coherent structures, Geophys. Res. Lett., 35, L12603, doi:10.1029/2008GL033957, 2008.; Branicki, M. and Kirwan, D.: Stirring: The Eckard paradigm revisited, Int. J. Eng. Sci., 458, 1027–1042, 2010.; Branicki, M. and Wiggins, S.: Finite-time Lagrangian transport analysis: stable and unstable manifolds of hyperbolic trajectories and finite-time Lyapunov exponents, Nonlin. Processes Geophys., 17, 1–36, doi:10.5194/npg-17-1-2010, 2010.; Brodeau, L., Barnier, B., Treguier, A., Penduff, T., and Gulev, S.: An ERA40-based atmospheric forcing for global ocean circulation models, Ocean Model., 31, 88–104, 2010.; Candela, J., Sheinbaum, J., Ochoa, J., Badan, A., and Leben, R.: The potential vorticity flux through the Yucatan Channel and the Loop Current in the Gulf of Mexico, Geophys. Res. Lett., 29, 16-1–16-4, doi:10.1029/2002GL015587,2002.; Ch{é}rubin, L., Morel, Y., and Chassignet, E.: Loop Current ring shedding: the formation of cyclones and the effect of topography, J. Phys. Oceanogr., 36, 569–591, 2006.; Fratantoni, P., Lee, T., Podesta, G., and Muller-Karger, F.: The influence of Loop Current perturbations on the formation and evolution of Tortugas eddies in the southern Straits of Florida, J. Geophys. Res-Ocean., 103, 24759, doi:10.1029/98JC02147, 1998.; Haller, G.: Distinguished material surfaces and coherent structures in three-dimensional fluid flows, Physica D, 149, 248–277, 2001{a}.; Haller, G.: Lagrangian structures and the rate of strain in a partition of two-dimensional turbulence, Phys. Fluids, 13, 3365, doi:10.1063/1.1403336, 2001{b}.; Haller, G.: Lagrangian coherent structures from approximate velocity data, Phys. Fluids., 14, 1851, doi:1851,10.1063/1.1477449, 2002.; Haller, G.: An objective definition of a vortex, J. Fluid Mech., 525, 1–26, 2005.; Haller, G.: A variational theory of hyperbolic Lagrangian Coherent Structures, Physica D, 240, 574–598, 2011.; Haller, G. and Beron-Vera, F. J.: Geodesic theory of transport barriers in two-dimensional flows, Physica D, 241, 1680–1702, 2012.; Haller, G. and Poje, A. C.: Eddy growth and mixing in mesoscale oceanographic flows, Nonlin. Processes Geophys., 4, 223–235, doi:10.5194/npg-4-223-1997, 1997.; Haller, G. and Poje, A. C.: Finite time transport in aperiodic flows, Physica D, 119, 352–380, 1998.; Jouanno, J., Sheinbaum, J., Barnier, B., and Molines, J.: The mesoscale variability in the Caribbean Sea, Part II: Energy sources, Ocean Model., 26, 226–239, 2009.; Kuznetsov, L., Toner, M., Kirwan, J., Jones, C., Kantha, L., and Choi, J.: The loop current and adjacent rings delineated by Lagrangian analysis of the near-surface flow, J. Mar. Res., 60, 405–429, 2002.; Leben, R.: Altimeter-derived loop current metrics, Geophys. Monogr., Amer. Geophys. Union, 161, 181–202, 2005.; Lekien, F. and Coulliette, C.: Chaotic stirring in quasi-turbulent flows, Philos. T. R. Soc. A., 365, 3061–3084, 2007.

 

Click To View

Additional Books


  • Quasi-biennial Oscillations Extracted fr... (by )
  • Shoaling of Internal Solitary Waves at t... (by )
  • Plasma Waves Above the Ion Cyclotron Fre... (by )
  • Bifurcations and Instabilities in Rotati... (by )
  • Hidden Semi-markov Model Based Earthquak... (by )
  • Diffusive Draining and Growth of Eddies ... (by )
  • Earthquake Source Parameters Which Displ... (by )
  • Intermittent Heating of the Solar Corona... (by )
  • Fractal Time Statistics of Ae-index Burs... (by )
  • A Probabilistic Seismic Hazard Model Bas... (by )
  • Solitary Wave in a Burridge-knopoff Mode... (by )
  • Impulse Exchange at the Surface of the O... (by )
Scroll Left
Scroll Right

 



Copyright © World Library Foundation. All rights reserved. eBooks from Hawaii eBook Library are sponsored by the World Library Foundation,
a 501c(4) Member's Support Non-Profit Organization, and is NOT affiliated with any governmental agency or department.