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SUMMARY:Interactions between phase change and boundary layer structure - A
 lena Malyarenko (University of Otago)
DTSTART:20171005T131500Z
DTEND:20171005T140000Z
UID:TALK84171@talks.cam.ac.uk
CONTACT:INI IT
DESCRIPTION:<span>Co-authors: Pat Langhorne		(University of Otago)\, Natal
 ie Robinson		(NIWA)\, Mike Williams		(NIWA)        <br></span><br>Thermody
 namic ice ablation includes both melting and dissolving of the ice. Existi
 ng parametrisations are usually based on the 3-equation model\, with equat
 ions that describe heat and salt flux balances together with the freezing 
 point equation for sea water. However\, these equations do not represent b
 oth melting and dissolving conditions\, or the transition between these co
 nditions. Nor do the 3 equations represent well the two dominant velocity 
 regimes: shear-driven and buoyancy-driven mixing.  Turbulent heat and salt
  transfer coefficients need to reflect the variety of boundary layer struc
 tures that can form under different velocity and temperature regimes.  <br
 ><span><br>Here the different conditions and velocity regimes are consider
 ed in the in context of multi-year observations of temperature\, velocity 
 and ablation rate from under the Ross Ice Shelf. These observations of a d
 issolving ice shelf in sub-zero conditions can be used to constrain transi
 tions from buoyancy-driven mixing to sheer-driven mixing. While these obse
 rvations are under an ice shelf they are expected to scale to the higher s
 alinities found in sea ice.&nbsp\;</span>
LOCATION:Seminar Room 1\, Newton Institute
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