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SUMMARY:Modeling macro-porosity of ridged sea ice in basin-scale models - 
 Andrew Roberts (Naval Postgraduate School)
DTSTART:20170913T084500Z
DTEND:20170913T093000Z
UID:TALK79071@talks.cam.ac.uk
CONTACT:INI IT
DESCRIPTION:<span>Co-authors: Elizabeth Hunke		(Los Alamos National Labora
 tory)\, William Lipscomb		(National Center for Atmospheric Research)\, Sam
 y Kamal		(Naval Postgraduate School)\, Wieslaw Maslowski		(Naval Postgradu
 ate School)        <br></span><span><br>One of the largest limitations of 
 current-generation sea ice models is that they characterize sea ice morpho
 logy using a thickness distribution\, g(h)\, over an area A(x). This inher
 ently introduces a scale limitation to sea ice models\, because g(h) only 
 represents the relative quantity of ice of  thickness\, h\, over a region\
 , rather than describe how thickness is locally organized.  Moreover\, the
  approach assumes that sea ice deformed into rafts\, folds\, buckles\, rid
 ges and hummocks is equally as porous as undeformed ice\, despite strong e
 vidence to the contrary. This problem may be addressed by expanding the st
 ate space of the thickness distribution to become a multivariate distribut
 ion g(h\,phi) where phi is the macro-porosity of sea ice rubble.  Then\, s
 ea ice ridging may be described using a Euler-Lagrange equation for ridge 
 cross-sections that mimic many of the characteristics of existing ridge-sc
 ale simulations.  The approach requires careful consideration of non-conse
 rvative components of ridging\, and\, in the most basic approach\, can use
  a Coulombic failure criteria applied vertically within ridges to predict 
 their angle of repose\, macro-porosity\, extent and seperation in large sc
 ale models.  This talk presents the theoretical basis for this new method 
 of simulating sea ice thickness.</span>
LOCATION:Seminar Room 1\, Newton Institute
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