The injection of zonal momentum by buoyancy forcing in a Southern Ocean Model

dc.contributor.authorHoward, Emma
dc.contributor.authorHogg, Andy
dc.contributor.authorWaterman, Stephanie
dc.contributor.authorMarshall, David P.
dc.date.accessioned2015-08-31T02:08:27Z
dc.date.available2015-08-31T02:08:27Z
dc.date.issued2015-01
dc.date.updated2016-06-14T08:44:56Z
dc.description.abstractAn overturning circulation, driven by prescribed buoyancy forcing, is used to set a zonal volume transport in a reentrant channel ocean model with three isopycnal layers. The channel is designed to represent the Southern Ocean such that the forced overturning resembles the lower limb of the meridional overturning circulation (MOC). The relative contributions of wind and buoyancy forcing to the zonal circulation are examined. It is found that the zonal volume transport is strongly dependent on the buoyancy forcing and that the eddy kinetic energy is primarily set by wind stress forcing. The zonal momentum budget integrated over each layer is considered in the buoyancy-forced, wind-forced, and combined forcing case. At equilibrium, sources and sinks of momentum are balanced, but the transient spinup reveals the source of momentum for the current. In the buoyancy-forced case, the forcing creates a baroclinic shear with westward flow in the lower layer, allowing topographic form stress and bottom friction to act as the initial sources of eastward momentum, with bottom friction acting over a longer time frame. In the wind-forced and combined forcing cases, the surface wind stress dominates the initial momentum budget, and the time to reach equilibration is shorter in the combined forcing simulation. These results imply that future changes in the rate of formation of Antarctic Bottom Water may alter the volume transport of the Antarctic Circumpolar Current.
dc.description.sponsorshipEH gratefully acknowledges the support of an A. L. Hales Scholarship provided by RSES. AMH was supported by an Australian Research Council Future Fellowship FT120100842. This research was undertaken on the NCI National Facility in Canberra, Australia, which is supported by the Australian Commonwealth Government.en_AU
dc.format13 pages
dc.identifier.issn0022-3670en_AU
dc.identifier.urihttp://hdl.handle.net/1885/15020
dc.publisherAmerican Meteorological Society
dc.relationhttp://purl.org/au-research/grants/arc/FT120100842
dc.rights© 2015 American Meteorological Society https://www2.ametsoc.org/ams/index.cfm/publications/authors/journal-and-bams-authors/author-resources/copyright-information/copyright-policy/Publisher's website permission to archive publisher's pdf after an embargo period of 6 months. The same for Sherpa/Romeo http://www.sherpa.ac.uk/romeo/issn/0022-3670/ (As of 31/8/2015).
dc.sourceJournal of Physical Oceanography
dc.subjectBuoyancy
dc.subjectCirculation/Dynamics
dc.subjectEddies
dc.subjectGeographic location/entity
dc.subjectSouthern Ocean
dc.subjectMeridional overturning circulation
dc.subjectTopographic effects
dc.subjectWind stress
dc.titleThe injection of zonal momentum by buoyancy forcing in a Southern Ocean Model
dc.typeJournal article
local.bibliographicCitation.issue1en_AU
local.bibliographicCitation.lastpage271en_AU
local.bibliographicCitation.startpage259en_AU
local.contributor.affiliationHogg, Andrew Mc., CPMS Research School of Earth Sciences, The Australian National Universityen_AU
local.contributor.affiliationHoward, Emma, CPMS Research School of Earth Sciences, The Australian National University
local.contributor.authoremailandy.hogg@anu.edu.auen_AU
local.contributor.authoruidu3586031en_AU
local.identifier.absfor040503 - Physical Oceanography
local.identifier.absseo961104 - Physical and Chemical Conditions of Water in Marine Environments
local.identifier.ariespublicationU3488905xPUB5240
local.identifier.citationvolume45en_AU
local.identifier.doi10.1175/JPO-D-14-0098.1en_AU
local.identifier.essn1520-0485en_AU
local.identifier.scopusID2-s2.0-84920885288
local.identifier.uidSubmittedByu4579722en_AU
local.publisher.urlhttp://www.ametsoc.org/en_AU
local.type.statusPublished Versionen_AU

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