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SUMMARY:Changes to sea ice thickness distribution due to Ice Shelf Water -
  Pat Langhorne (University of Otago)
DTSTART:20170913T104500Z
DTEND:20170913T113000Z
UID:TALK79091@talks.cam.ac.uk
CONTACT:INI IT
DESCRIPTION:Co-authors: Inga Smith\, Greg Leonard\, Andrew Pauling\, Pat W
 ongpan\, David Dempsey\, Ken Hughes\, Craig Purdie\, Eamon Frazer (Univers
 ity of Otago)\, Mike Williams\, Natalie Robinson\, Craig Stevens (NIWA)\, 
 Alena Malyarenko\, Stefan Jendersie (NIWA & University of Otago)\, Wolfgan
 g Rack\, Gemma Brett\, Dan Price (University of Canterbury)\, Christian Ha
 as (Alfred Wegener Institute)\, Cecilia Bitz (University of Washington)\, 
 Andy Mahoney (Geophysical Institute) and Tim Haskell (Callaghan Innovation
  Ltd)&nbsp\;<br><br>Satellite observations show that the winter maximum se
 a ice extent around Antarctica has been increasing slowly over the past th
 ree decades\, a behaviour superficially at odds with &ldquo\;global warmin
 g&rdquo\;.&nbsp\; One hypothesis is that an increase in freshwater input f
 rom the base of ice shelves has influenced sea ice extent. This process ca
 n drive seawater temperatures below the surface freezing point. Ice crysta
 ls then persist in the supercooled water and add to the mass of the coasta
 l sea ice cover. The crystals may form a porous\, friable layer\, called t
 he sub-ice platelet layer\, which can be several metres thick beneath the 
 two-metres of sea ice. Consequently platelet ice formation not only causes
  sea ice to be thicker\, but it also alters the hydrostatic relationship b
 etween sea ice elevation and thickness\, influencing satellite altimeter d
 etermination of sea ice thickness.  &nbsp\;  <br><br>Here we describe ice 
 shelf&ndash\;sea ice interaction at a range of scales from parameterizatio
 n in an Earth System Model\, to the sub-metre detail of winter ice-ocean r
 elationships. On a regional scale we have focused on a location affected b
 y an ISW outflow at the surface. Regional ocean modeling and satellite alt
 imeter observations provide context for airborne sea ice thickness surveys
  using electromagnetic (EM) induction sounding. These regional surveys hav
 e been supported over smaller geographic areas by detailed on-ice sea ice 
 and snow thickness measurements\, by on-ice EM induction transects of sea 
 ice thickness\, and by under-ice oceanographic observations that track the
  heat deficit and mixing in the upper ocean at selected sites.      <br><b
 r>
LOCATION:Seminar Room 1\, Newton Institute
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