Freshwater hosing

[matthew_thomas@yale_edu]

Dear all I am looking for advice on how to run a North Atlantic freshwater hosing experiment in CESM 1.0. I would like to apply a surface freshwater flux to the ocean around the edges of Greenland only. This flux is then to be globally compensated by a small salt flux everywhere else.The FAQ for CESM 1.2 has detailed the files to be modified for a hosing experiment (which I assume is relevant for CESM 1.0) - http://www.cesm.ucar.edu/models/cesm1.2/pop2/doc/faq/#forcing_hosing.   However, since my flux configuration is quite complex (i.e. relative to forcing within a simple box), I would like to read in the fluxes from file. This would be relatively simple if CESM were run in serial, but a parallel configuration requires that the flux file be split up amongst the various processors. I am looking for advice on how best to do this.   My question is therefore: how can I read in, and distribute amongst the different processors, a surface freshwater flux file for the purpose of a freshwater hosing experiment?   Thanks very much for any advice!    Matthew

 

[l_vankampenhout@uu_nl]

Hi Matthew,opening and closing files within POP can be done through the high-level functions construct_file(), data_set(), construct_io_field(), destroy_file()
If you search the code for these functions you'll find examples of what you need.
One catch: the file that you read must be in the same format as the model resolution, so the compensations you describe should already been applied to this.
Cheers, Leo

 

[l_vankampenhout@uu_nl]

Hi Matthew,opening and closing files within POP can be done through the high-level functions construct_file(), data_set(), construct_io_field(), destroy_file()
If you search the code for these functions you'll find examples of what you need.
One catch: the file that you read must be in the same format as the model resolution, so the compensations you describe should already been applied to this.
Cheers, Leo

 

[matthew_thomas@yale_edu]

Hi LeoExcellent, thank you very much indeed for the advice. I will certainly investigate these functions then to see if they can solve my problem. My input file has been constructed according to the ocean model grid, and it already contains both the freshwater addition and its global compensation. So there shouldn't be any problem there, if I understand correctly. Thanks again. Matthew

 

[matthew_thomas@yale_edu]

Hi LeoExcellent, thank you very much indeed for the advice. I will certainly investigate these functions then to see if they can solve my problem. My input file has been constructed according to the ocean model grid, and it already contains both the freshwater addition and its global compensation. So there shouldn't be any problem there, if I understand correctly. Thanks again. Matthew