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SUMMARY:Models of multi-scale and multi-phase sea ice thermodynamics - And
 rew  Wells (University of Oxford)
DTSTART:20170914T080000Z
DTEND:20170914T084500Z
UID:TALK79161@talks.cam.ac.uk
CONTACT:INI IT
DESCRIPTION:Sea ice is a multi-phase material\, consisting of a mixture of
  solid ice crystals and liquid brine. The properties of this mixture vary 
 significantly during initial ice growth\, from the growth of suspensions o
 f frazil ice crystals in supercooled leads and polynyas through to a react
 ive porous material during consolidated congelation growth. The resulting 
 mixture is also inherently multi-scale\, with the macroscopic scales of in
 terest such as ice depth or mixed layer depth being many order of magnitud
 e larger than the scale of an individual ice crystal.   This talk will pro
 vide an introduction to key continuum models of the multi-phase and multi-
 scale thermodynamics of sea ice growth. I will introduce so-called "mushy 
 layer theory" for characterising the evolution of reactive porous sea ice\
 , and also review theories of crystal suspension dynamics derived from a m
 aster equation. Selected case studies will be used to illustrate the appli
 cation of these theories to predict ice accumulation rates\, structural pr
 operties of ice\, and interaction with convective flow.
LOCATION:Seminar Room 1\, Newton Institute
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