On the relevance of diapycnal mixing for the stability of frontal meanders

Rodríguez-Santana, Ángel; Sangrà, Pablo; Marrero-Díaz, Ángeles

doi:10.3989/scimar.2001.65s1259

Cited by 8 publications

(1 citation statement)

References 22 publications

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“…This estimate is of the same order as observations for epipycnal upwelling within an anticyclone in the North Atlantic [ Martin and Richards , 2001] and epipycnal upwelling/downwelling patches in a quasi permanent eddy in the western Mediterranean Sea [ Viudez et al , 1996]. Notice that for a steady state solution to exist a cross‐vortex circulation cell is necessary, which implies diapycnal velocities of this same order [ Rodríguez‐Santana et al , 1999, 2001].…”

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confidence: 70%

Life history of an anticyclonic eddy

et al. 2005

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[1] 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.

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