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    Channelization of plumes beneath ice shelves

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    Type
    Article
    Authors
    Dallaston, M. C.
    Hewitt, I. J.
    Wells, A. J.
    KAUST Grant Number
    KUK-C1-013-04
    Date
    2015-11-11
    Online Publication Date
    2015-11-11
    Print Publication Date
    2015-12
    Permanent link to this record
    http://hdl.handle.net/10754/597753
    
    Metadata
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    Abstract
    © 2015 Cambridge University Press. We study a simplified model of ice-ocean interaction beneath a floating ice shelf, and investigate the possibility for channels to form in the ice shelf base due to spatial variations in conditions at the grounding line. The model combines an extensional thin-film description of viscous ice flow in the shelf, with melting at its base driven by a turbulent ocean plume. Small transverse perturbations to the one-dimensional steady state are considered, driven either by ice thickness or subglacial discharge variations across the grounding line. Either forcing leads to the growth of channels downstream, with melting driven by locally enhanced ocean velocities, and thus heat transfer. Narrow channels are smoothed out due to turbulent mixing in the ocean plume, leading to a preferred wavelength for channel growth. In the absence of perturbations at the grounding line, linear stability analysis suggests that the one-dimensional state is stable to initial perturbations, chiefly due to the background ice advection.
    Citation
    Dallaston MC, Hewitt IJ, Wells AJ (2015) Channelization of plumes beneath ice shelves. Journal of Fluid Mechanics 785: 109–134. Available: http://dx.doi.org/10.1017/jfm.2015.609.
    Sponsors
    This publication arises from research funded in part by Award No KUK-C1-013-04,made by King Abdullah University of Science and Technology (KAUST), andin part by the John Fell Oxford University Press (OUP) Research Fund. M.C.D.acknowledges further support from the Engineering and Physical Sciences ResearchCouncil (EPSRC) of the UK through grant no. EP/K008595/1. A.J.W. acknowledgesfinancial support through the research program of the European Union FP7 awardPCIG13-GA-2013-618610 SEAICE-CFD. I.J.H. was supported by a Marie Curie FP7Integration Grant within the 7th European Union Framework Programme. The authorsare indebted to the three anonymous referees whose comments significantly improvedthe final paper.
    Publisher
    Cambridge University Press (CUP)
    Journal
    Journal of Fluid Mechanics
    DOI
    10.1017/jfm.2015.609
    ae974a485f413a2113503eed53cd6c53
    10.1017/jfm.2015.609
    Scopus Count
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    Publications Acknowledging KAUST Support

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