The Damping Effect of Bottom Topography on Internal Decadal-Scale Oscillations of the Thermohaline Circulation
نویسنده
چکیده
By comparing the response of flat and bowl-shaped basins to fixed heat fluxes of various magnitudes, it is determined that coastal topography has a considerable damping influence upon internal decadal oscillations of the thermohaline circulation. It is proposed that this is because the adjustment of baroclinic currents to the no-normal-flow boundary condition at weakly stratified coasts is aided in the topography case by the generation of substantial barotropic flow.
منابع مشابه
On the Robustness of the Interdecadal Modes of the Thermohaline Circulation
Ocean models in box geometry forced by constant surface fluxes of density have been found to spontaneously generate interdecadal oscillations of the thermohaline circulation. This paper analyzes the sensitivity of these oscillations to various physical effects, including the presence of mesoscale turbulence, various thermal surface boundary conditions, and the presence of wind forcing or bottom...
متن کاملLinear versus Self-Sustained Interdecadal Thermohaline Variability in a Coupled Box Model
Recent studies of decadal/interdecadal climate variability suggested two main classes of mechanisms: selfsustained (supercritical) oscillations due to the internal nonlinearity of the ocean and linear (subcritical) thermohaline oscillations driven by stochastic atmospheric forcing. The authors use a coupled ocean–atmosphere meridional box model to carefully examine these two alternatives. It is...
متن کاملOn the role of topography and wind stress on the stability of the thermohaline circulation
A frictional geostrophic model is used to examine how the stability of the thermo haline circulation is a ected by idealized topographic variations and the presence or absence of wind stress If the ow exhibits collapses we consider how topography and wind stress a ect the ensuing oscillations Large scale slope up towards the north or the west can signi cantly destabilize the circulation by modi...
متن کاملDesign Supplementary Controller Based on Stabilizing Effect of Delay for Damping Inter Area Oscillations in a Power System
The delay associated with signal transmission through the wide-area measurement system reduces the functionality of the power oscillation damping control system. One of the important issues is the poor operation of the supplementary controller against delay existence, which limits the efficiency of damping of ancillary equipment, such as SVCs in a power system. This paper as a solution proposes...
متن کاملزمان میرایی نوسانات عرضی کینک مشاهده شده در حلقه های تاج نواحی فعال با استفاده از تلسکوپ ای آی ای نصب شده بر اس دی او
A coronal loop can be oscillated in various directions. A basic type of coronal loop oscillation is called transverse oscillation that can be caused by different factors, such as nearby active regions and flares. The damping of transverse oscillation may be produced by the dissipation mechanism or the wake of the traveling disturbance. The aim of this paper is to estimate the damping time of tr...
متن کامل