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SUMMARY:Brine rejection from sea ice - Grae Worster (University of Cambrid
 ge)
DTSTART:20170914T150000Z
DTEND:20170914T160000Z
UID:TALK79231@talks.cam.ac.uk
CONTACT:INI IT
DESCRIPTION:Brine rejection from sea ice provides a significant contributi
 on to the buoyancy flux that drives ocean circulations.&nbsp\; Indeed\, it
  provides the dominant contribution in the case of polynyas but the situat
 ion with consolidated sea ice is more complex.&nbsp\; Although salt is rej
 ected completely by the ice crystals that form when the ocean freezes\, it
  can be retained as saturated brine within the interstices of sea ice.&nbs
 p\; Buoyancy-driven convection driven in the interior of sea ice can cause
  the dense brine to drain into the underlying ocean via brine channels tha
 t form by dissolution of the ice matrix.&nbsp\; These intricate interactio
 ns between fluid flow and phase change occur on the scale of millimetres t
 o centimetres within sea ice but their consequences must be captured withi
 n the sea-ice components of climate models.&nbsp\; I will describe the fun
 damental physical processes that govern the occurrence and rates of brine 
 rejection from sea ice\, and show how the understanding gained from detail
 ed mathematical models of local\, three-dimensional processes can be incor
 porated into an appropriately parameterised one-dimensional model of conve
 ction in sea ice suitable for inclusion in climate models.
LOCATION:Seminar Room 1\, Newton Institute
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