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SUMMARY:Fragmentation and melting of the seasonal sea ice cover - Adam Bat
 eson (University of Reading)
DTSTART:20220922T143000Z
DTEND:20220922T150000Z
UID:TALK178334@talks.cam.ac.uk
DESCRIPTION:Observations show that sea ice floes range in size from just a
  few metres to tens of kilometres. Often observations of the floe size dis
 tribution (FSD) are fitted using a power law\, though the validity of the 
 power-law description of the FSD is disputed. The size of these floes has 
 an important influence on several sea ice processes including the volume o
 f lateral melt\, momentum and heat exchange between the sea ice\, ocean\, 
 and atmosphere\, and the rheological behaviour of the sea ice. There have 
 been several recent efforts to replace traditional sea ice model assumptio
 ns of a fixed floe size with methods to represent variable floe size.\nHer
 e we consider two different approaches to modelling the FSD within the CIC
 E sea ice model: the first assumes the FSD follows a power law with a fixe
 d exponent\, whereas the second is a prognostic approach where the shape o
 f the FSD is an emergent characteristic. We show the impact of including t
 hese FSD models on both sea ice mass balance and melt rates and find high 
 model sensitivity to poorly constrained parameters. We also assess the per
 formance of both models using novel satellite-derived observations of mid-
 sized floes and demonstrate the need to include a representation of brittl
 e fracture of floes within the prognostic approach. Finally\, we explore t
 he model response to how brittle fracture is represented in the prognostic
  FSD model and discuss the need for a fully physically derived treatment o
 f brittle fracture for use in FSD models.\n&nbsp\;
LOCATION:Seminar Room 1\, Newton Institute
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