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

[Jonny Williams]

Thanks a lot to Dimitris and Martin for the their replies!

For your collective information, I am currently trialling Martin's
suggestion and will be sure to let know how I get on ;)

Thanks!

Jonny


On 13 June 2014 15:01, Dimitris Menemenlis <dmenemenlis at gmail.com> wrote:

> ... or, given that you are changing resolution and that the tendency terms
> are likely to be either irrelevant
> (and even potentially problematic), you could just initialize model with:
>
> input file "data"
>
> # Input datasets
>  &PARM05
>  bathyFile      = ... ,
>  hydrogThetaFile= ...,'
>  hydrogSaltFile = ...,
>  uVelInitFile   = ...,
>  vVelInitFile   = ...,
>  pSurfInitFile  = ...,
>  &
>
> input file "data.seaice"
>
> # SEAICE parameters
>  &SEAICE_PARM01
> ...
>       AreaFile           = '...,
>       HsnowFile          = '...,
>       HsaltFile          = ...,
>       HeffFile           = ...,
>       UiceFile           = ...,
>       ViceFile           = ...,
>  &
>
> On Jun 13, 2014, at 6:23 AM, Martin Losch <Martin.Losch at awi.de> wrote:
>
> > 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
>
>
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-- 
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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