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SUMMARY:Digital Sea Ice Physics - A novel approach for computing and param
 etrising sea ice properties for geophysical applications -  Sønke Maus (N
 orwegian University of Science and Technology)
DTSTART:20210421T130000Z
DTEND:20210421T140000Z
UID:TALK156289@talks.cam.ac.uk
CONTACT:Dr Irena Vankova
DESCRIPTION:One of the large challenges in sea ice science is how sea ice 
 properties (e.g.\, albedo\, thermal conductivity) on small scales influenc
 e properties and processes on larger scales (e.g.\, the floe or ridge scal
 e and basin-scale sea ice behaviour). To make progress one has to understa
 nd the variability in small-scale properties which can span several orders
  of magnitude (e.g. permeability). For many properties a strong dependence
  on temperature and salinity has been found\, yet the detailed physical pr
 ocesses leading to this variability have remained unclear: On the one hand
  are the bulk fractions of sea ice constituents (gas\, ice\, brine and sol
 id salts) often insufficiently known or measured. On the other hand\, ther
 e is the lack in observations of 3D sea ice micro-structure to which the p
 hysical properties are related.\n\nIn the present talk I will focus on the
  concept of "Digital Sea Ice physics" to improve our understanding of sea 
 ice properties\, their dependence on microstructure and growth conditions\
 , and illustrate several applications to geophysical sea ice problems. The
  concept is adopted from rock science where it has been established as "Di
 gital Rock Physics" (DRP) during the last decade. It is based on 3D X-ray 
 tomographic imaging and digitizing of the sea ice pore space\, followed by
  direct numerical computation of its effective physical properties. In thi
 s way the relationship between effective physical properties of sea ice an
 d its bulk constituents (volume fractions of ice\, air\, brine and solid s
 alts) is determined and related to micro-scale characteristics of the pore
  space\, providing an improved understanding of the properties' variabilit
 y.\n\nI will begin the talk with an overview of sea ice properties and mic
 rostructure and their variability\, to illustrate related challenges and o
 pen questions in sea ice science\, identifying the need of 3D microstructu
 re information for many topics. I will then describe the work flow of “D
 igital Sea Ice Physics” from field sampling to physical property computa
 tions\, as well as the challenges for the porous medium sea ice\, when com
 pared to rocks and snow. I will discuss several applications to obtain sea
  ice properties that are relevant for sea ice and climate modelling: (i) t
 ransport properties of sea ice and recent results on sea ice permeability 
 and electrical conductivity\; (ii) the microstructure at the sea ice ocean
  interface (with relevance for on ice-ocean heat\, salt and momentum excha
 nge as well as ice-ice friction) and (iii) the ice surface regime (with re
 levance for albedo and inter-facial processes between sea ice and snow). D
 igital Sea ice physics is a concept that has large future potential due to
  increasing computational power to handle large 3D images. The talk closes
  with an overview of climate-relevant sea ice properties for which the app
 roach opens new paths to fundamental knowledge and understanding.
LOCATION:British Antarctic Survey\, Zoom
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