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SUMMARY:A System of Conservative Regridding for Ice / Atmosphere Coupling 
 in a GCM - Dr Robert Fischer (NASA GISS )
DTSTART:20130925T130000Z
DTEND:20130925T140000Z
UID:TALK46707@talks.cam.ac.uk
CONTACT:Rosie Williams
DESCRIPTION:The method of elevation classes has proven to be a useful way 
 for a low-resolution GCM to produce high-resolution downscaled surface mas
 s balance fields\, for use in one-way studies coupling GCMs and ice flow m
 odels.  However\, past uses of elevation classes have been a cause of non-
 conservation of mass and energy\, causing problems for potential two-way c
 oupling.\n\nWe present a generalization of the method of elevation classes
  that conserves mass and energy fluxes.  We identify three grids between w
 hich data must be regridded\, and five transformations between those grids
  required by a typical coupled GCM / ice flow model.  We show how each of 
 those five transformations may be implemented in a conservative manner.  C
 onfounding real-world issues are discussed\, including the use of projecti
 ons for ice modeling\, how to handle dynamically changing ice geometry\, a
 nd modifications required for finite element ice models.\n\nWe have implem
 ented these transformations in GLINT2\, a library used to couple GCMs with
  ice models.  Source code and documentation are available for download.\n
LOCATION:British Antarctic Survey\, Room 187
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