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SUMMARY:A new continuum rheological model for the deformation and drift of
  sea ice - Veronique Dansereau (CNRS (Centre national de la recherche scie
 ntifique))
DTSTART:20170911T130000Z
DTEND:20170911T133000Z
UID:TALK78682@talks.cam.ac.uk
CONTACT:INI IT
DESCRIPTION:Co-authors: Pierre Saramito (CNRS-LJK)\, J&eacute\;r&ocirc\;me
  Weiss (CNRS-ISTerre)\, Philippe Lattes (Total S.A. E&P)<br><br>Axel Roy (
 1) <br>V&eacute\;ronique Dansereau (2)* <br>J&eacute\;r&ocirc\;me Weiss (2
 ) &nbsp\;<br>Christian Haas (3) <br>Matthieu Chevalier (4) <br><span><br> 
 </span> 1&nbsp\;&Eacute\;cole Nationale de la M&eacute\;t&eacute\;orologie
 \, M&eacute\;t&eacute\;o France\, Toulouse\, France <br>2 Institut des Sci
 ences de la Terre\, CNRS UMR 5275\, Universit&eacute\; de Grenoble\, Greno
 ble\, France <br>3 Alfred Wegener Institute\, Bremerhaven\, Germany <br>4 
 CNRM/GMGEC/IOGA M&eacute\;t&eacute\;o France\, Toulouse\, France <br><span
 ><br> </span> <span><span>	Sea ice models are most often compared to each 
 other and to observations in terms of the spatial distribution of the simu
 lated ice thickness. An equally important\, and perhaps more appropriate\,
  metric to investigate the mechanical behaviour of the sea ice cover is th
 e ice thickness <i>distribution\, </i>i.e.\, the probability density funct
 ion\, of which some valuable information have been available for some time
  from drill-hole\, upward looking submarine-mounted sonar (USL) and airbor
 ne electromagnetic (EM) sounding measurements. <br></span> </span> <span><
 br> </span> 	An important issue naturally arises when comparing sea ice th
 ickness distributions based on measurements made at the meter scale with t
 hat estimated from regional and global sea ice model simulations\, with a 
 typical resolution of a few kilometres\; the issue of scale dependance. Us
 ing USL sea ice draft profiles and EM thickness measurements\, we investig
 ate the scaling properties of the sea ice thickness over the Arctic to add
 ress the following question: how does the sea ice thickness distribution e
 volve with the scale of observation? <br><span><br> </span> 	The autocorre
 lation calculations performed here allow extending previous analyses based
  on single USL transects (up to 50 km-long) and point to long-range correl
 ations in the thickness of the sea ice cover reaching as far as a few hund
 reds of kilometres. Multi-fractal analyses are conducted to investigate th
 e variability of the the ice thickness distribution with the spatial scale
  of observation up to these scales.   <span><br> </span>
LOCATION:Seminar Room 1\, Newton Institute
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