The rectification of wind-driven flow due to its instabilities

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ID: 308418
1998
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Abstract
Within a quasi-geostrophic two-layer model of the wind-driven ocean circulation, an idealized symmetric double gyre flow is considered. When lateral friction is large enough, this flow is steady and characterized by a motionless lower layer. As friction is decreased, the flow undergoes a transition to time-dependence through a Hopf bifurcation, associated with a mixed barotropic/baroclinic instability. It is shown that the nonlinear self-interaction of this oscillatory unstable mode induces a nonzero time mean response in the lower layer. The origin of this deep flow is clarified through a weakly nonlinear analysis near critical conditions. It is explained how the perturbation is associated with both fluxes of anomalous layer thickness and Reynolds' stresses, due to vertical and horizontal phase lags, respectively. Furthermore, it is explained how the patterns of vorticity input, integrated over a cycle of the perturbation, induce a forcing of the second layer. Results deduced from computed trajectories at supercritical conditions support the conclusions from the weakly nonlinear analysis. This time-dependent view of the origin of the deep circulation is complementary to the classical (steady) picture based on the closure of geostrophic contours and forcing by interfacial friction, and may help to interpret results of eddy-resolving numerical models.
Reference Key
openalex_W2084252703 Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Caroline A. Katsman, Henk A. Dijkstra, Sybren Drijfhout
Journal journal of marine research
Year 1998
DOI
10.1357/002224098765213586
URL
https://doi.org/10.1357/002224098765213586
Keywords Keywords not found

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