Barotropic instabilities of the Agulhas Current system and their relation to ring formation

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ID: 305719
2001
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Abstract
Recent work has shown that different steady retroflection regimes, a viscous and an inertial regime, exist for the Agulhas Current system in an idealized geometry. In this paper, instabilities of the barotropic steady flows are considered by solving the linear stability problem numerically. Barotropic instabilities occur as so-called Hopf bifurcations in the viscous regime, with corresponding patterns related to Rossby basin modes. Depending on the value of the reduced gravity parameter, these instabilities may introduce intermonthly to interannual variability into the retroflection region. Finite amplitude development of these instabilities display 'ring-like' localized anomaly patterns which travel around the tip of the continent. The results demonstrate that, within the barotropic context, (i) the frequency of the ring formation is set by the physics of the large-scale instabilities and (ii) the rectification processes due to these instabilities decrease the degree of retroflection of the mean state. The latter result suggests that the dominant mechanism of the retroflection is captured within the steady balances.
Reference Key
openalex_W2031130779 Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Henk A. Dijkstra, Wilhelmus P. M. de Ruijter
Journal journal of marine research
Year 2001
DOI
10.1357/002224001762842172
URL
https://doi.org/10.1357/002224001762842172
Keywords Keywords not found

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