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Ablation of sloping ice faces into polar seawater

Mondal, Mainak; Gayen, Bishakhdatta; Griffiths, Ross; Kerr, Ross

Description

The effects of the slope of an ice–seawater interface on the mechanisms and rate of ablation of the ice by natural convection are examined using turbulence-resolving simulations. Solutions are obtained for ice slopes 𝜃 , at a fixed ambient salinity and temperature, chosen to represent common Antarctic ocean conditions. For laminar boundary layers the ablation rate decreases with height, whereas in the turbulent regime the ablation rate is found to be height independent. The simulated...[Show more]

dc.contributor.authorMondal, Mainak
dc.contributor.authorGayen, Bishakhdatta
dc.contributor.authorGriffiths, Ross
dc.contributor.authorKerr, Ross
dc.date.accessioned2020-01-10T03:25:20Z
dc.identifier.issn0022-1120
dc.identifier.urihttp://hdl.handle.net/1885/196871
dc.description.abstractThe effects of the slope of an ice–seawater interface on the mechanisms and rate of ablation of the ice by natural convection are examined using turbulence-resolving simulations. Solutions are obtained for ice slopes 𝜃 , at a fixed ambient salinity and temperature, chosen to represent common Antarctic ocean conditions. For laminar boundary layers the ablation rate decreases with height, whereas in the turbulent regime the ablation rate is found to be height independent. The simulated laminar ablation rates scale with 𝜃 , whereas in the turbulent regime it follows a 𝜃 scaling, both consistent with the theoretical predictions developed here. The reduction in the ablation rate with shallower slopes arises as a result of the development of stable density stratification beneath the ice face, which reduces turbulent buoyancy fluxes to the ice. The turbulent kinetic energy budget of the flow shows that, for very steep slopes, both buoyancy and shear production are drivers of turbulence, whereas for shallower slopes shear production becomes the dominant mechanism for sustaining turbulence in the convective boundary layer.
dc.description.sponsorshipComputations were carried out using the Australian National Computational Infrastructure, through the National Computational Merit Allocation Scheme supported Ablation of a sloping ice face 569 by the Australian Government. This work was supported by Australian Research Council grants DP120102772 and DP120102744. B.G. was supported by ARC DECRA Fellowship DE140100089 and an Australian Antarctic Division RJL Hawk Fellowship to B.G.
dc.format.mimetypeapplication/pdf
dc.language.isoen_AU
dc.publisherCambridge University Press
dc.rights© 2019 Cambridge University Press
dc.sourceJournal of Fluid Mechanics
dc.subjectbuoyant boundary layers
dc.subjectice sheets
dc.subjectturbulent convection
dc.titleAblation of sloping ice faces into polar seawater
dc.typeJournal article
local.description.notesImported from ARIES
local.identifier.citationvolume863
dcterms.dateAccepted2018-11-24
dc.date.issued2019-01-28
local.identifier.absfor040503 - Physical Oceanography
local.identifier.ariespublicationu3102795xPUB959
local.publisher.urlhttps://www.cambridge.org/
local.type.statusAccepted Version
local.contributor.affiliationMondal, Mainak, College of Science, ANU
local.contributor.affiliationGayen, Bishakhdatta, College of Science, ANU
local.contributor.affiliationGriffiths, Ross, College of Science, ANU
local.contributor.affiliationKerr, Ross, College of Science, ANU
dc.relationhttp://purl.org/au-research/grants/arc/DP120102772
dc.relationhttp://purl.org/au-research/grants/arc/DP120102744
dc.relationhttp://purl.org/au-research/grants/arc/DE140100089
local.bibliographicCitation.startpage545
local.bibliographicCitation.lastpage571
local.identifier.doi10.1017/jfm.2018.970
local.identifier.absseo969901 - Antarctic and Sub-Antarctic Oceanography
dc.date.updated2019-08-25T08:19:12Z
local.identifier.scopusID2-s2.0-85060726284
dcterms.accessRightsOpen Access
dc.provenancehttp://sherpa.ac.uk/romeo/issn/0022-1120/..."author can archive post-print (ie final draft post-refereeing) after 6 month embargo" from SHERPA/RoMEO site (as at 15.1.20)
CollectionsANU Research Publications

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