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Title: Life history of an anticyclonic eddy
Authors: Sangrá Inciarte, Pablo 
Pelegrí Llopart,José Luis 
Hernández-Guerra, A. 
Arregui, Igor
Martín, J. M. 
Marrero-Díaz, A. 
Martínez Marrero, Antonio 
Ratsimandresy, Andry W.
Rodríguez-Santana, A. 
UNESCO Clasification: 251007 Oceanografía física
Keywords: Sea-Surface Temperature
Gulf-Stream Meanders
Geostrophic Vortices
Canary-Islands, et al
Issue Date: 2005
Publisher: 0148-0227
Journal: Journal of Geophysical Research 
Abstract: We use the trajectory of three buoys dragged below the surface mixed layer, together with sea surface temperature imagery, to examine the evolution of an anticyclonic warm-core eddy since its generation by the Canary Islands. Two buoys remain within the eddy during some 100 days, and the third one remains almost 200 days, while drifting southwestward up to 500 km with the mean Canary Current. The eddy merges with several younger anticyclonic and cyclonic eddies, in each occasion, suffering substantial changes. The eddy core, defined as a region with near-solid-body-type rotation and radial convergence, initially occupies the whole eddy. After interacting with another vortex the inner core markedly slows down, although it continues displaying radial convergence and relatively small radial oscillations, and an uncoupled outer ring is formed or enhanced, which revolves even more slowly and displays large radial fluctuations. The vortex extensive life is consistent with its inertially stable character and observations of radial convergence. A very simple model of vortex merging, where cylinders fuse conserving mass and angular momentum, gives fair results. The observations suggest that the eddy changes, as the result of its own slow evolution and sporadic mixing events, from a young stage, where the core retains its vorticity and occupies most of the eddy, through a mature stage, where the eddy has a reduced inner core and a slowly revolving outer ring, to a decay stage, where the vorticity maximum is substantially reduced.
ISSN: 0148-0227
DOI: 10.1029/2004JC002526
Source: Journal of Geophysical Research C: Oceans [ISSN 0148-0227], v. 110, p. 1-19
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