Skip navigation
Skip navigation

Multiple Zonal Jets in a Differentially Heated Rotating Annulus

Smith, Carlowen; Speer, Kevin G; Griffiths, Ross

Description

A laboratory experiment of multiple baroclinic zonal jets is described, thought to be dynamically similar to flow observed in the Antarctic Circumpolar Current. Differential heating sets the overall temperature difference and drives unstable baroclinic flow, but the circulation is free to determine its own structure and local stratification; experiments were run to a stationary state and extend the dynamical regime of previous experiments. Atopographic analog to the planetary β effect is...[Show more]

dc.contributor.authorSmith, Carlowen
dc.contributor.authorSpeer, Kevin G
dc.contributor.authorGriffiths, Ross
dc.date.accessioned2015-12-10T22:43:46Z
dc.identifier.issn0022-3670
dc.identifier.urihttp://hdl.handle.net/1885/58315
dc.description.abstractA laboratory experiment of multiple baroclinic zonal jets is described, thought to be dynamically similar to flow observed in the Antarctic Circumpolar Current. Differential heating sets the overall temperature difference and drives unstable baroclinic flow, but the circulation is free to determine its own structure and local stratification; experiments were run to a stationary state and extend the dynamical regime of previous experiments. Atopographic analog to the planetary β effect is imposed by the gradient of fluid depth with radius supplied by a sloping bottom and a parabolic free surface. New regimes of a low thermal Rossby number (RoT ~ 10-3) and high Taylor number (Ta ~ 1011) are explored such that the deformation radius Lp is much smaller than the annulus gap width L and similar to the Rhines length. Multiple jets emerge in rough proportion to the smallness of the Rhines scale, relatively insensitive to the Taylor number; a regime diagram taking the β effect into account better reflects the emergence of the jets. Eddy momentum fluxes are consistent with an active role in maintaining the jets, and jet development appears to follow the Vallis and Maltrud phenomenology of anisotropic wave-turbulence interaction on a ß plane. Intermittency and episodes of coherent meridional jet migration occur, especially during spinup.
dc.publisherAmerican Meteorological Society
dc.rightsAuthor/s retain copyright
dc.sourceJournal of Physical Oceanography
dc.titleMultiple Zonal Jets in a Differentially Heated Rotating Annulus
dc.typeJournal article
local.description.notesImported from ARIES
local.identifier.citationvolume44
dc.date.issued2014
local.identifier.absfor040503 - Physical Oceanography
local.identifier.ariespublicationu4027924xPUB437
local.type.statusPublished Version
local.contributor.affiliationSmith, Carlowen, Florida State University
local.contributor.affiliationSpeer, Kevin G, The Florida State University
local.contributor.affiliationGriffiths, Ross, College of Physical and Mathematical Sciences, ANU
local.bibliographicCitation.issue9
local.bibliographicCitation.startpage2273
local.bibliographicCitation.lastpage2291
local.identifier.doi10.1175/JPO-D-13-0255.1
local.identifier.absseo969902 - Marine Oceanic Processes (excl. climate related)
dc.date.updated2015-12-09T11:17:15Z
local.identifier.scopusID2-s2.0-84907087398
local.identifier.thomsonID000341334300002
dcterms.accessRightsOpen Access
CollectionsANU Research Publications

Download

File Description SizeFormat Image
01_Smith_Multiple_Zonal_Jets_in_a_2014.pdf1.51 MBAdobe PDF


Items in Open Research are protected by copyright, with all rights reserved, unless otherwise indicated.

Updated:  19 May 2020/ Responsible Officer:  University Librarian/ Page Contact:  Library Systems & Web Coordinator