[MITgcm-support] using low resolution spin up as input to a high resolution model

[Martin Losch]

Hi Jonny,

if you can live with pickup files that are NOT in netcdf format (mnc_read_pickup = .false.) then you can simply provide one global pickup file in MDS-format (the *.data *.meta pairs). A file pickup.??????????.data will be read by any model decomposition. Personally I prefer this method over the netcdf pickups, even when I use netcdf for other output. With “globalFiles = .TRUE.”, or useSingleCPUio = .TRUE., (and mnc_write_pickup=.false.) you’ll even get “global” pickup files directly from the model.

Martin

On Jun 13, 2014, at 1:13 PM, Jonny Williams <Jonny.Williams at bristol.ac.uk> wrote:

> Hi everyone
> 
> I am currently trying to work out how I can use a 1000 year long spinup of a 1 degree resolution model as the input to a 0.1 degree equivalent. 
> 
> Both versions have 48 processors (although clearly I could vary this).
> 
> I know how to smooth, regrid and impose the new (high resolution) land/sea mask on to my pickup files already.
> 
> The pickup files are of the form...
> 
> pickup.0000324000.t040.nc
> 
> The problem is that processor number 40 (as indicated at the end of the above file name) of the 1 degree model does not spatially correspond to processor number 40 in the 0.1 degree model due to the different processor decomposition.
> 
> One way round this would be to 'glue' the pickup files together into a global field (using the gluemncbig script) BUT then I will surely have to 'unglue' the resulting global field together in order to use it as a restart for the 0.1 model!
> 
> Does anyone have experience of this kind of issue? Presumably I am not the first to want to do this kind of thing?...
> 
> Many thanks for your time!!
> 
> Jonny
> 
> -- 
> Dr Jonny Williams
> School of Geographical Sciences
> University of Bristol
> University Road
> BS8 1SS
> 
> +44 (0)117 3318352
> jonny.williams at bristol.ac.uk
> bit.ly/jonnywilliams
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