# Unified Model **URL:** https://cms-helpdesk.ncas.ac.uk/c/unified-model/5.md [Latest](https://cms-helpdesk.ncas.ac.uk/latest.md) · [Categories](https://cms-helpdesk.ncas.ac.uk/categories.md) · [Tags](https://cms-helpdesk.ncas.ac.uk/tags.md) --- ## [About the Unified Model category](https://cms-helpdesk.ncas.ac.uk/t/about-the-unified-model-category/11)
**Author:** [@RosalynHatcher](https://cms-helpdesk.ncas.ac.uk/u/RosalynHatcher)\ **Replies:** 0
Queries relating to running the Unified Model. Please include as much information as is relevant, but especially: Be sure to include the id of the UM job/suite (eg xbcde, u-ax291). Which platform you are running o… --- ## [Effect of changing processor number](https://cms-helpdesk.ncas.ac.uk/t/effect-of-changing-processor-number/2189)
**Author:** [@timmyf](https://cms-helpdesk.ncas.ac.uk/u/timmyf)\ **Replies:** 1\ **Last updated:** [5 October 2026 13:07 UTC](https://cms-helpdesk.ncas.ac.uk/t/effect-of-changing-processor-number/2189 "2026-10-05T13:07:57Z")
Hi, When I was testing one my code modifications in UM12.0 in Archer2-puma2 for my research related work, I tried changing to the below processor numbers in the rose-suite.conf MAIN\_ATM\_PROCX=26 MAIN\_ATM\_PROCY=24 com… --- ## [Submit-failed limit reached](https://cms-helpdesk.ncas.ac.uk/t/submit-failed-limit-reached/2188)
**Author:** [@mollymac](https://cms-helpdesk.ncas.ac.uk/u/mollymac)\ **Replies:** 2\ **Last updated:** [1 October 2026 14:19 UTC](https://cms-helpdesk.ncas.ac.uk/t/submit-failed-limit-reached/2188 "2026-10-01T14:19:40Z")
Hi, All my jobs are going straight to ‘submit-failed’ In my job-activity.log I have: (ln01) 2026-10-01T08:55:44Z \[STDERR\] sbatch: error: AssocMaxCpuMinutesPerJobLimit (ln01) 2026-10-01T08:55:44Z \[STDERR\] sbatch: erro… --- ## [4km - 1.5km nested suite running into errors - help](https://cms-helpdesk.ncas.ac.uk/t/4km-1-5km-nested-suite-running-into-errors-help/2181)
**Author:** [@miclen](https://cms-helpdesk.ncas.ac.uk/u/miclen)\ **Replies:** 1\ **Last updated:** [25 September 2026 14:08 UTC](https://cms-helpdesk.ncas.ac.uk/t/4km-1-5km-nested-suite-running-into-errors-help/2181 "2026-09-25T14:08:14Z")
Hi NCAS, If you have the chance to help with this, I would really welcome your assistance. For weeks I’ve been trying to get a nested suite running, with a 4km domain and a 1.5km domain inside of it. I have run into a b… --- ## [UKESM1.1 output accumulating in History\_Data and exceeding ARCHER2 quota](https://cms-helpdesk.ncas.ac.uk/t/ukesm1-1-output-accumulating-in-history-data-and-exceeding-archer2-quota/2182)
**Author:** [@LuckyZhang](https://cms-helpdesk.ncas.ac.uk/u/LuckyZhang)\ **Replies:** 1\ **Last updated:** [24 September 2026 11:58 UTC](https://cms-helpdesk.ncas.ac.uk/t/ukesm1-1-output-accumulating-in-history-data-and-exceeding-archer2-quota/2182 "2026-09-24T11:58:18Z")
Dear NCAS team, I am running the UKESM1.1 vn13.9 suite u-ec043 copied from the official PI control suite u-dr681. The suite uses monthly cycles and successfully transfers processed output to JASMIN using Globus. Howeve… --- ## [Unified Model on Cirrus](https://cms-helpdesk.ncas.ac.uk/t/unified-model-on-cirrus/2179)
**Author:** [@FranMorris](https://cms-helpdesk.ncas.ac.uk/u/FranMorris)\ **Replies:** 5\ **Last updated:** [21 September 2026 12:06 UTC](https://cms-helpdesk.ncas.ac.uk/t/unified-model-on-cirrus/2179 "2026-09-21T12:06:02Z")
Not sure if this is relevant or should need another thread (sorry if so) but it hasn’t been clear to me whether the UM itself is going to be installed and standard suites ported to cirrus? My understanding was that this … --- ## [Coupled UKESM1.1 historical start dumps](https://cms-helpdesk.ncas.ac.uk/t/coupled-ukesm1-1-historical-start-dumps/2168)
**Author:** [@isangha](https://cms-helpdesk.ncas.ac.uk/u/isangha)\ **Replies:** 1\ **Last updated:** [8 September 2026 16:32 UTC](https://cms-helpdesk.ncas.ac.uk/t/coupled-ukesm1-1-historical-start-dumps/2168 "2026-09-08T16:32:29Z")
Hello, I am trying to set off a historical free-running coupled UKESM1.1 suite (copy of u-dr682) starting in 1980 to provide a 30-year run-up for some SSP simulations. I was wondering if someone could point me to where … --- ## [Perturbed start dump not changing run outputs](https://cms-helpdesk.ncas.ac.uk/t/perturbed-start-dump-not-changing-run-outputs/2166)
**Author:** [@isangha](https://cms-helpdesk.ncas.ac.uk/u/isangha)\ **Replies:** 11\ **Last updated:** [7 September 2026 15:19 UTC](https://cms-helpdesk.ncas.ac.uk/t/perturbed-start-dump-not-changing-run-outputs/2166 "2026-09-07T15:19:05Z")
Hello, I’m a bit stumped on this and am hoping someone can find something I’ve overlooked! I am trying to set up a 3 member ensemble of AMIP historical free-running simulations from 1979 - 2014 (copies of u-dr799). My t… --- ## [Re-running a UKESM postproc\_atmos task using pp files](https://cms-helpdesk.ncas.ac.uk/t/re-running-a-ukesm-postproc-atmos-task-using-pp-files/2160)
**Author:** [@DanHodson](https://cms-helpdesk.ncas.ac.uk/u/DanHodson)\ **Replies:** 2\ **Last updated:** [7 September 2026 11:02 UTC](https://cms-helpdesk.ncas.ac.uk/t/re-running-a-ukesm-postproc-atmos-task-using-pp-files/2160 "2026-09-07T11:02:51Z")
Hi All! We have a UKESM postproc\_atmos task that is a bit stuck (/home/n02/n02/bsenapati/cylc-run/u-eb029/run1/log/job/19040401T0000Z/postproc\_atmos). What seems to have happened is that the task ran out of disk space … --- ## [Implementation of ozone ancil](https://cms-helpdesk.ncas.ac.uk/t/implementation-of-ozone-ancil/2164)
**Author:** [@c.j.r.williams](https://cms-helpdesk.ncas.ac.uk/u/c.j.r.williams)\ **Replies:** 1\ **Last updated:** [2 September 2026 15:13 UTC](https://cms-helpdesk.ncas.ac.uk/t/implementation-of-ozone-ancil/2164 "2026-09-02T15:13:37Z")
Hi, Sorry to bother you, but I have a couple of (hopefully rather simple) technical questions concerning the implementation of ancillaries, and in particular ozone, in the model. I am fairly certain I know the answer t… --- ## [Ice: Vertical thermo error / flux conservation error / Thermo iteration does not converge](https://cms-helpdesk.ncas.ac.uk/t/ice-vertical-thermo-error-flux-conservation-error-thermo-iteration-does-not-converge/2158)
**Author:** [@harryjgrosvenor](https://cms-helpdesk.ncas.ac.uk/u/harryjgrosvenor)\ **Replies:** 0\ **Last updated:** [27 August 2026 10:50 UTC](https://cms-helpdesk.ncas.ac.uk/t/ice-vertical-thermo-error-flux-conservation-error-thermo-iteration-does-not-converge/2158 "2026-08-27T10:50:14Z")
Dear CMS Team, This is running a HadGEM3-GC3.1-LL coupled suite. UM job suite: u-eb985 log file path: /work/n02/n02/hjgrosvenor/cylc-run/u-eb985/log/job/18540101T0000Z/coupled/02/job.out Hoping you are well. I am wo… --- ## [UKESM1.1 coupled suite running extremely slowly on ARCHER2 after Cylc 8 migration](https://cms-helpdesk.ncas.ac.uk/t/ukesm1-1-coupled-suite-running-extremely-slowly-on-archer2-after-cylc-8-migration/2155)
**Author:** [@LuckyZhang](https://cms-helpdesk.ncas.ac.uk/u/LuckyZhang)\ **Replies:** 6\ **Last updated:** [24 August 2026 16:10 UTC](https://cms-helpdesk.ncas.ac.uk/t/ukesm1-1-coupled-suite-running-extremely-slowly-on-archer2-after-cylc-8-migration/2155 "2026-08-24T16:10:10Z")
Dear CMS team, I am experiencing a severe performance issue with a UKESM1.1 fully coupled pre-industrial workflow on ARCHER2. The workflow details are: Parent suite: u-cj511; Current workflow: u-eb425; Model: UKESM1… --- ## [Error Finding Next Lookup Entry In Atmosphere only Timeslice Suite](https://cms-helpdesk.ncas.ac.uk/t/error-finding-next-lookup-entry-in-atmosphere-only-timeslice-suite/2147)
**Author:** [@Ed\_Bearman](https://cms-helpdesk.ncas.ac.uk/u/Ed_Bearman)\ **Replies:** 3\ **Last updated:** [18 August 2026 07:52 UTC](https://cms-helpdesk.ncas.ac.uk/t/error-finding-next-lookup-entry-in-atmosphere-only-timeslice-suite/2147 "2026-08-18T07:52:54Z")
Hi, I am running an atmosphere only timeslice suite (u-dz534), which has been running for 6 years fine, but I have now run into the following error: ? Error code: 500 ? Error from routine: UP\_ANCIL ? Error message… --- ## [STWORKS error after running successfully for 2 years](https://cms-helpdesk.ncas.ac.uk/t/stworks-error-after-running-successfully-for-2-years/2145)
**Author:** [@isangha](https://cms-helpdesk.ncas.ac.uk/u/isangha)\ **Replies:** 3\ **Last updated:** [14 August 2026 12:54 UTC](https://cms-helpdesk.ncas.ac.uk/t/stworks-error-after-running-successfully-for-2-years/2145 "2026-08-14T12:54:31Z")
Hello, I have two free-running jobs (u-eb430 and u-eb461) that have been running successfully from the start of 1979, but both failed in the atmos\_main step with the following error: ??? ???!!!???!!!???!!!???!!!???!!!… --- ## [Walltime exceeded time out in atmos\_main](https://cms-helpdesk.ncas.ac.uk/t/walltime-exceeded-time-out-in-atmos-main/2144)
**Author:** [@isangha](https://cms-helpdesk.ncas.ac.uk/u/isangha)\ **Replies:** 10\ **Last updated:** [12 August 2026 09:17 UTC](https://cms-helpdesk.ncas.ac.uk/t/walltime-exceeded-time-out-in-atmos-main/2144 "2026-08-12T09:17:28Z")
Hello, I am running two suites (u-eb430 and u-eb461), both copies of u-dr799 (free-running AMIP configuration). They both keep failing with walltime exceeded error. The first month runs in just over an hour, the second … --- ## [Question about BITCOMP\_NRUN](https://cms-helpdesk.ncas.ac.uk/t/question-about-bitcomp-nrun/2143)
**Author:** [@c.j.r.williams](https://cms-helpdesk.ncas.ac.uk/u/c.j.r.williams)\ **Replies:** 5\ **Last updated:** [7 August 2026 15:26 UTC](https://cms-helpdesk.ncas.ac.uk/t/question-about-bitcomp-nrun/2143 "2026-08-07T15:26:02Z")
Hi, Sorry to bother you, but I have a (possibly) quick question concerning BITCOMP\_NRUN. The below is taken from the official MO instructions on running climate type suites, at https://code.metoffice.gov.uk/trac/moci/w… --- ## [Negative mass in set\_thermodynamic Error](https://cms-helpdesk.ncas.ac.uk/t/negative-mass-in-set-thermodynamic-error/2141)
**Author:** [@kqiu](https://cms-helpdesk.ncas.ac.uk/u/kqiu)\ **Replies:** 3\ **Last updated:** [7 August 2026 11:24 UTC](https://cms-helpdesk.ncas.ac.uk/t/negative-mass-in-set-thermodynamic-error/2141 "2026-08-07T11:24:15Z")
Hi, I am running the nesting suite u-eb261 on Monsoon3, and the following task has failed: 20190103T0000Z/Europe\_km11\_RAL3P3\_um\_fcst\_000 The error message says: Error code: 100 Error from routine: set\_thermodynamic … --- ## [UKESM Coupled suite porting](https://cms-helpdesk.ncas.ac.uk/t/ukesm-coupled-suite-porting/2139)
**Author:** [@db18005](https://cms-helpdesk.ncas.ac.uk/u/db18005)\ **Replies:** 2\ **Last updated:** [3 August 2026 07:29 UTC](https://cms-helpdesk.ncas.ac.uk/t/ukesm-coupled-suite-porting/2139 "2026-08-03T07:29:09Z")
Dear CMS support, I am looking to port a suite of the fully interactive hydrogen with methane suite by Brown, M. A. J., Warwick, N. J., Abraham, N. L., Griffiths, P. T., Rumbold, S. T., Folberth, G. A., O’Connor, F. M.,… --- ## [Restart cylc workflow following postproc\_atmos failure](https://cms-helpdesk.ncas.ac.uk/t/restart-cylc-workflow-following-postproc-atmos-failure/2137)
**Author:** [@lmarshall](https://cms-helpdesk.ncas.ac.uk/u/lmarshall)\ **Replies:** 16\ **Last updated:** [30 July 2026 13:02 UTC](https://cms-helpdesk.ncas.ac.uk/t/restart-cylc-workflow-following-postproc-atmos-failure/2137 "2026-07-30T13:02:10Z")
Dear CMS team, My suite u-ea645 has failed in postproc\_atmos on cycle 185210 due to a corrupt file (as in Error at postproc\_atmos - Unified Model - NCAS Modelling Support). I have tried retriggering this cycle but as th… --- ## [Unable to WGDOS to this accuracy](https://cms-helpdesk.ncas.ac.uk/t/unable-to-wgdos-to-this-accuracy/2136)
**Author:** [@kqiu](https://cms-helpdesk.ncas.ac.uk/u/kqiu)\ **Replies:** 10\ **Last updated:** [24 July 2026 11:34 UTC](https://cms-helpdesk.ncas.ac.uk/t/unable-to-wgdos-to-this-accuracy/2136 "2026-07-24T11:34:10Z")
Hello, I’m experiencing a persistent “Unable to WGDOS pack to this accuracy” error with my suite u-dw943 for the task “Europe\_km11\_RAL3P3\_um\_fcst\_000”. This task has run successfully before, but because I had an issue … --- ## [Will the ancillary suite work for paleoclimate configurations?](https://cms-helpdesk.ncas.ac.uk/t/will-the-ancillary-suite-work-for-paleoclimate-configurations/2114)
**Author:** [@an25872](https://cms-helpdesk.ncas.ac.uk/u/an25872)\ **Replies:** 2\ **Last updated:** [20 July 2026 14:36 UTC](https://cms-helpdesk.ncas.ac.uk/t/will-the-ancillary-suite-work-for-paleoclimate-configurations/2114 "2026-07-20T14:36:29Z")
Hi all, Recently, I have been trying to generate the ancillary files required for paleo simulations (e.g. the LGM and Pliocene). To do it, I copied u-cc111/GC5\_N96\_ORCA1\_ancils to u-dz309 and updated it to run on ARCHE… --- ## [Umui not working on puma2](https://cms-helpdesk.ncas.ac.uk/t/umui-not-working-on-puma2/2130)
**Author:** [@peterh](https://cms-helpdesk.ncas.ac.uk/u/peterh)\ **Replies:** 2\ **Last updated:** [15 July 2026 13:38 UTC](https://cms-helpdesk.ncas.ac.uk/t/umui-not-working-on-puma2/2130 "2026-07-15T13:38:35Z")
Dear NCAS, the UMUI is not working after the outage on ARCHER2/PUMA2 over the last few days. Thanks. --- ## [Lib-4171 : UNRECOVERABLE library error continued](https://cms-helpdesk.ncas.ac.uk/t/lib-4171-unrecoverable-library-error-continued/2120)
**Author:** [@penmaher](https://cms-helpdesk.ncas.ac.uk/u/penmaher)\ **Replies:** 3\ **Last updated:** [15 July 2026 11:34 UTC](https://cms-helpdesk.ncas.ac.uk/t/lib-4171-unrecoverable-library-error-continued/2120 "2026-07-15T11:34:46Z")
Continuing the discussion from Lib-4171 : UNRECOVERABLE library error: Hi CSM team, Could I request further support on this suite please? I have encountered similar problem a few times in the last few weeks but I have … --- ## [Postproc\_atmos\_archive walltime error in CMIP6 free-running suite](https://cms-helpdesk.ncas.ac.uk/t/postproc-atmos-archive-walltime-error-in-cmip6-free-running-suite/2131)
**Author:** [@isangha](https://cms-helpdesk.ncas.ac.uk/u/isangha)\ **Replies:** 1\ **Last updated:** [15 July 2026 08:57 UTC](https://cms-helpdesk.ncas.ac.uk/t/postproc-atmos-archive-walltime-error-in-cmip6-free-running-suite/2131 "2026-07-15T08:57:36Z")
Hello, I am trying to run a CMIP6 SSP245 suite (u-ea318 : Diff \[359152:361207\] for e/a/3/1/8 – roses-u copy of u-dr682). The postproc\_atmos\_archive job is failing with a walltime error. Is it possible to make the wallti… --- ## [Running nudged AMIP UM13.9 past 2014](https://cms-helpdesk.ncas.ac.uk/t/running-nudged-amip-um13-9-past-2014/2122)
**Author:** [@isangha](https://cms-helpdesk.ncas.ac.uk/u/isangha)\ **Replies:** 14\ **Last updated:** [8 July 2026 12:34 UTC](https://cms-helpdesk.ncas.ac.uk/t/running-nudged-amip-um13-9-past-2014/2122 "2026-07-08T12:34:43Z")
Hello, I am running a nudged AMIP vn13.9 suite (u-du013 copy of u-ds836). It has run through to 2014, but I now want to run it to 2015 to get a dump file for 20150101 to initialise a free-running CMIP SSP2-45 simulation… --- ## [Model dump archive](https://cms-helpdesk.ncas.ac.uk/t/model-dump-archive/2115)
**Author:** [@eewz](https://cms-helpdesk.ncas.ac.uk/u/eewz)\ **Replies:** 1\ **Last updated:** [3 July 2026 08:51 UTC](https://cms-helpdesk.ncas.ac.uk/t/model-dump-archive/2115 "2026-07-03T08:51:34Z")
Dear helpdesk, I did a test run with suite u-dz360. But the model output are stored in /home/users/weiyu.zhang.ext/cylc-run/u-dz360/run1/share/cycle/20220617T0600Z/glm/um rather than moose:/devfc/$ARCHIVE\_SET\_NAME/ I t… --- ## [Slow running](https://cms-helpdesk.ncas.ac.uk/t/slow-running/2106)
**Author:** [@SimonTett](https://cms-helpdesk.ncas.ac.uk/u/SimonTett)\ **Replies:** 4\ **Last updated:** [23 June 2026 09:49 UTC](https://cms-helpdesk.ncas.ac.uk/t/slow-running/2106 "2026-06-23T09:49:26Z")
I have had a second failure (I did not report first one) from an atmospheric model simulation where I am varying parameters. I run in three month chunks with a time limit of 1 hour 55 mins and do not normally have proble… --- ## [Model failure](https://cms-helpdesk.ncas.ac.uk/t/model-failure/2104)
**Author:** [@SimonTett](https://cms-helpdesk.ncas.ac.uk/u/SimonTett)\ **Replies:** 2\ **Last updated:** [16 June 2026 12:29 UTC](https://cms-helpdesk.ncas.ac.uk/t/model-failure/2104 "2026-06-16T12:29:11Z")
I had an I/O failure while the model was trying to read a netcdf file. Failure message was (from /home/n02/n02/tetts/cylc-run/dfols46p\_4/dq007/work/20110601T0000Z/atmos\_main/pe\_output/dq007.fort6.pe0) was: Atm\_Step: T… --- ## [Lib-4171 : UNRECOVERABLE library error](https://cms-helpdesk.ncas.ac.uk/t/lib-4171-unrecoverable-library-error/2095)
**Author:** [@penmaher](https://cms-helpdesk.ncas.ac.uk/u/penmaher)\ **Replies:** 10\ **Last updated:** [5 June 2026 12:08 UTC](https://cms-helpdesk.ncas.ac.uk/t/lib-4171-unrecoverable-library-error/2095 "2026-06-05T12:08:52Z")
Morning CMS team, I am in the process of testing my suite u-dt414. Up until now I have only been running for a few months. I have attempted to run a 5 year test and the model is failing after completing 10 months. The s… --- ## [UM suite failing to submit in Puma2-Archer2](https://cms-helpdesk.ncas.ac.uk/t/um-suite-failing-to-submit-in-puma2-archer2/2093)
**Author:** [@timmyf](https://cms-helpdesk.ncas.ac.uk/u/timmyf)\ **Replies:** 4\ **Last updated:** [2 June 2026 21:11 UTC](https://cms-helpdesk.ncas.ac.uk/t/um-suite-failing-to-submit-in-puma2-archer2/2093 "2026-06-02T21:11:40Z")
Hi, I was trying to run a UM12.0 suite after a gap of some two months in Puma2 - Archer2. Initially I had to follow the instructions in Restarting after puma2 reboot But after that I am getting error “submit-failed”. I… [Next page](https://cms-helpdesk.ncas.ac.uk/c/unified-model/5.md?page=1)