Objective detection of oceanic eddies and the agulhas leakage

Francisco J. Beron-Vera, Yan Wang, María J. Olascoaga, Gustavo J. Goni, George Haller

Research output: Contribution to journalArticle

79 Scopus citations

Abstract

Mesoscale oceanic eddies are routinely detected from instantaneous velocities derived from satellite altimetry data. While simple to implement, this approach often gives spurious results and hides true material transport. Here it is shown how geodesic transport theory, a recently developed technique from nonlinear dynamical systems, uncovers eddies objectively. Applying this theory to altimetry-derived velocities in the South Atlantic reveals, for the first time, Agulhas rings that preserve their material coherence for several months, while ring candidates yielded by other approaches tend to disperse or leak within weeks. These findings suggest that available velocity-based estimates for the Agulhas leakage, as well as for its impact on ocean circulation and climate, need revision.

Original languageEnglish (US)
Pages (from-to)1426-1438
Number of pages13
JournalJournal of Physical Oceanography
Volume43
Issue number7
DOIs
StatePublished - Aug 14 2013

ASJC Scopus subject areas

  • Oceanography

Fingerprint Dive into the research topics of 'Objective detection of oceanic eddies and the agulhas leakage'. Together they form a unique fingerprint.

  • Cite this