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Ticket Resolution Summary Owner Reporter
#1456 fixed Segmentation Fault in an 8.4 job with user created SST/Sea Ice Ancils annette pliojop


I have copied an existing 8.4 UM job that I know runs (xkmwb) and added into it my own Anciliaries for SSTs and Sea Ice. This job is xkmwc.

My aim, is to create a year of 12 months of SST and Sea Ice data, which then repeats for every year of the job, so that I have identical SST/Sea Ice forcings throughout my simulation length (~50 years target).

Everytime I have tried to set the job to run, it crashes after about 1 minute with a Segmentation Fault. I have tried a variety of things, such as

In xancil

  • Having "create well formed ancils" ticked to both yes and no
  • Setting the year to be 0000, 1981 (year in UMUI), 1990 (year in start dump)
  • Setting the day to be both 1 and 15, adjusting the "define monthly mean to be the middle of the month" as appropriate.

General xancil settings are for Vn8.4 and the create ancils open in xconv. They have the same header names as the Ancil used to force xkwmb.

In the UMUI

  • I have ensured that the Sea Ice and SST Ancil boxes are set to update every 1 months
  • I have played around with the run lengths incase it was an issue with repeating the same 12 months of data.

I am now at somewhat of a loss with what to try next. For a previous ticket that Grenville helped with, I have chmod'd my directories so they should be readable.

My xancil general settings are saved as:


I know from my leave files that the ancils are being found and opened by the model, but the model is then seg faulting out. As the only change between the job that runs fine (xkmwb) and the job that fails (xkmwc) is these ancils, I can only conclude they are at fault.



#1476 fixed UM-UKCA crash on first attempt to nudge to ERA-Interim data annette James


I've tried to introduce nudging towards ERA Interim data to a job that previously ran, the new job being xkpid. The model's crashed and I'm struggling to make sense of the output written to the attached .leave file.

Amongst the changes was the inclusion of a hand edit to compile with netcdf libraries (necessary if nudging whilst continuing to use 360 day ancilliaries). I realise that, though I included this hand edit, I never checked it was appropriate on ARCHER (c.f. HECTOR?).

I was wondering if that could that be the problem, and if not, whether you could point me in the right direction? I attach a copy of said hand edit too.

Many thanks,


#1511 completed Nemo CDF tools annette wx019276


I have some nemo data on the ORCA025 grid that I am trying to do some simple data analysis on - eg zonal means. I was told about NEMO CDF tools, however I can't seem to locate these tools. My job was run on monsoon, the umtwiki directs you to "tools are currently installed in /project/ujcc/CDFTOOLS on linux (and in ~hadci/bin/CDFTOOLS on the IBM)" however I can't get to these directories, I am not sure if this is because I am external to the Met Office or if it is out of date as the page is dated 2010.

I was wondering if the CDF tools are available on the postprocessor at the Met Office, or if they are available on jasmin? (or potentially available locally at Reading)

Any advice on this would be much appreciated.

Many thanks, Ruth

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