On the topographic modulation of large-scale eddying flows
MetadataShow full item record
The modulation of large-scale eddying flows by gentle variation in topography is examined using a combi- nation of direct numerical simulations and theoretical arguments. The basic state is represented by a laterally uniform zonal current that is restricted to the upper layer of a baroclinically unstable quasigeostrophic two-layer system. Therefore, the observed topographically induced generation of large-scale patterns is attributed entirely to the action of mesoscale eddies. The parameter regime investigated in this study is not conducive to the spontaneous formation of stationary zonal jets. The interaction between the large-scale current, eddies, and topography is described using an asymptotic multiscale model. The ability of the model to explicitly represent the interaction between distinct flow components makes it possible to unambiguously interpret the essential dynamics of the topographic/eddy-induced modulation. The multiscale solutions obtained reflect the balance between the modification of the meridional fluxes of potential vorticity (PV) due to the variation in topography and the corresponding modification of PV fluxes due to the induced large-scale circulation. The predictions of the asymptotic theory are successfully tested by comparing to the ones obtained by direct numerical simulations.
The article of record as published may be found at http://dx.doi.org/10.1175/JPO-D-17-0024.1
Showing items related by title, author, creator and subject.
Allen, Jared L. (Monterey California. Naval Postgraduate School, 2005-06);With the ever increasing popularity of wireless internet, its scale is broadening. While the IEEE 802.15 standard provides the parameters necessary for a wireless personal area network (WPAN), the IEEE 802.16a standard ...
Mackin, Jere Gene (Monterey, California. Naval Postgraduate School, 1972-06);An apparatus was designed and constructed to measure the modulation transfer function of the atmospheric medium as a function of wavelength of light. The modulation transfer function (MTF) in this case was considered ...
Boedeker, Scott. (Monterey, California. Naval Postgraduate School, 2001-12);To investigate the role of wind forcing, bottom topography and thermohaline gradients on classical as well as unique features of the Leeuwin Current system (LCS), five experiments are conducted with a sigma coordinate, ...