Providing the ARCHER community with adjoint modelling tools for high performance oceanographic and cryospheric computation

The MITgcm (MIT General Circulation Model, http://mitgcm.org/) is a numerical  model  designed  for  study  of  the  atmosphere,  ocean,  and  climate  (Marshall  et  al.  1997a,b). Its nonChydrostatic formulation enables it to simulate fluid phenomena  over  a  wide  range  of  scales;  its  adjoint  capability  enables  it  to  be  applied  to  sensitivity  analysis  and  state  estimation  problems.  By  employing  fluid  isomorphisms,  one  hydrodynamical  kernel  can  be  used  to  simulate  flow  in  both  the atmosphere and ocean.  

This report describes the work undertaken under the embedded CSE programme  of  the  ARCHER  UK  National  Supercomputing  Service  (www.archer.ac.uk),  and  was entitled “Providing the ARCHER community with adjoint modelling tools for  highCperformance oceanographic and cryospheric computation”, where the main proposer was Dr Dan Jones (British Antarctic Survey, or BAS), with coCproposers  Dr  Dan  Goldberg  (University  of  Edinburgh,  or  UoE),  Dr  Paul  Holland  (BAS),  and  Dr  David  Ferreira  (Reading  University).  The  technical  work,  performed  by  Dr  Sudipta  Goswami  (BAS)  and  Dr  Gavin  Pringle  (UoE),  was  undertaken  between  midCFebruary  and  midCDecember,  2015.  A  recent  version  of  MITgcm,  namely  version c65i, has been ported to ARCHER for all ARCHER users.