UM - Minimum working example?

Atmosphere Unified Model
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21

Are you able to use the ancillaries under /g/data/access/TIDS/UM/ancil/atmos/GC5/n320e? This is the main mirror of ancil data from the Met Office.

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22

I support @Scott’s assertion/suggestion. (If it works that is, and I can’t see why it wouldn’t.)

23

Ok the ancils are no problem. The issue is the start_dumps.

There are three directories in /cylc-run/u-dl058/share/data/etc that link to /g/data/dx2/gc4/2013-2014_ecmwf_initial_conditions/:

ocean_startdumps -> /g/data/dx2/gc4/2013-2014_ecmwf_initial_conditions/FOAMv14d
startdumps -> /g/data/dx2/gc4/2013-2014_ecmwf_initial_conditions/ecmwf_raw
surf -> /g/data/dx2/gc4/2013-2014_ecmwf_initial_conditions/surf

But I can remove those links from that directory and um_recon works fine. Evidently you don’t need those files when running in uncoupled mode.

However, the UM atmospheric dump comes from the dp9 project:
/g/data/dp9/ukmo_mass/opfc/atm/mogreps-g/rerun/202001.file/20200116T0000Z_engl_t+3_000

So @griff it looks like you’re off the hook and I can remove all dx2 dependencies.

But we are left with a single dp9 dependency.

Can we move some of the UM start dumps into ~access?

The entire directory /g/data/dp9/ukmo_mass/opfc/atm/mogreps-g/rerun/202001.file is 398 Gb, but a single start dump is only 17 Gb.

A ‘minimum working example’ would only require one file?

24

Happy to, can you and the NRI folks give me a good path to put it?

25

This path already exists and seems to be appropriate for the task:

/g/data/access/GC5_ancil/gc5/startdumps/
26

@MartinDix the directory /g/data/access/GC5_ancil/gc5/startdumps is only writable by you, if this is a good location can you please change the permissions and I’ll add this file

27

Was thinking it might be good to put a README.txt in that directory so in the future, anyone wandering into that directory knows the UM restart file is used by suite u-dl058

EDIT : Was also thinking it might be good to store the outputs so users can compare against the baseline. The output netCDF files for a one day’s worth of forecasts (output at 6 hourly intervals) are 644 Mb.

See

/scratch/gb02/pag548/GC5_runs/u-dl058/atmos/

for an example.