# \#Ancillaries **URL:** https://cms-helpdesk.ncas.ac.uk/tag/ancillaries/25.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) --- ## [Permission denied Error during SAm\_4km\_RA2T\_um\_surf\_ostia step](https://cms-helpdesk.ncas.ac.uk/t/permission-denied-error-during-sam-4km-ra2t-um-surf-ostia-step/2040)
**Author:** [@scottan32](https://cms-helpdesk.ncas.ac.uk/u/scottan32)\ **Replies:** 3\ **Last updated:** [20 March 2026 15:24 UTC](https://cms-helpdesk.ncas.ac.uk/t/permission-denied-error-during-sam-4km-ra2t-um-surf-ostia-step/2040 "2026-03-20T15:24:39Z")
I am running suite u-dx731 on ARCHER2, which is itself a copy of u-ds822, which runs fine on my colleagues’ setup. When I run u-dx731, I get the following error during the SAm\_4km\_RA2T\_um\_surf\_ostia step of the workflow… --- ## [ANTS ancillary files on JASMIN](https://cms-helpdesk.ncas.ac.uk/t/ants-ancillary-files-on-jasmin/2020)
**Author:** [@emrobi](https://cms-helpdesk.ncas.ac.uk/u/emrobi)\ **Replies:** 2\ **Last updated:** [4 March 2026 17:04 UTC](https://cms-helpdesk.ncas.ac.uk/t/ants-ancillary-files-on-jasmin/2020 "2026-03-04T17:04:48Z")
Hi, I’m trying to get an ANTS suite running on JASMIN to create JULES ancillaries, following on from tickets 1638 and 1792. My suite is u-dx415. Some of the tasks are failing as some of the expected input files aren’t a… --- ## [Gotchas within converting to post-2015 for nudged MONSOON3 v13.9 UKESM1.1 AMIP runs](https://cms-helpdesk.ncas.ac.uk/t/gotchas-within-converting-to-post-2015-for-nudged-monsoon3-v13-9-ukesm1-1-amip-runs/1975)
**Author:** [@gmann](https://cms-helpdesk.ncas.ac.uk/u/gmann)\ **Replies:** 1\ **Last updated:** [25 January 2026 14:22 UTC](https://cms-helpdesk.ncas.ac.uk/t/gotchas-within-converting-to-post-2015-for-nudged-monsoon3-v13-9-ukesm1-1-amip-runs/1975 "2026-01-25T14:22:02Z")
Dear NCAS-CMS Helpdesk folks, This is just to post email-exchange that flags some “gotcha” glitches that people may encounter when converting the standard MONSOON v13.9 UKESM1.1 AMIP suite (u-ds836) to 2015+ It’s in t… --- ## [Xancil AMIP SSTs](https://cms-helpdesk.ncas.ac.uk/t/xancil-amip-ssts/1826)
**Author:** [@SimonTett](https://cms-helpdesk.ncas.ac.uk/u/SimonTett)\ **Replies:** 5\ **Last updated:** [15 October 2025 10:09 UTC](https://cms-helpdesk.ncas.ac.uk/t/xancil-amip-ssts/1826 "2025-10-15T10:09:07Z")
I am trying to make an SST ancillary. I make this by reading in the standard AMIP SST ancillary ('/work/y07/shared/umshared/CMIP6\_ANCIL/data/ancils/n96e/timeseries\_1870-2016/SstSeaIce/sst\_amip\_n96e.anc) and adding 4K to … --- ## [Modifying existing ancillary file using iris](https://cms-helpdesk.ncas.ac.uk/t/modifying-existing-ancillary-file-using-iris/1759)
**Author:** [@SimonTett](https://cms-helpdesk.ncas.ac.uk/u/SimonTett)\ **Replies:** 6\ **Last updated:** [29 July 2025 17:36 UTC](https://cms-helpdesk.ncas.ac.uk/t/modifying-existing-ancillary-file-using-iris/1759 "2025-07-29T17:36:15Z")
Dear Helpdesk, my current approach to making ancillaries is to convert the ancillary to netcdf then manipulate it using xarray, write out the modified data as netcdf and then convert to an ancillary file using xancil. … --- ## [Porting ancillary suite to ARCHER2?](https://cms-helpdesk.ncas.ac.uk/t/porting-ancillary-suite-to-archer2/1510)
**Author:** [@c.j.r.williams](https://cms-helpdesk.ncas.ac.uk/u/c.j.r.williams)\ **Replies:** 2\ **Last updated:** [29 August 2024 10:17 UTC](https://cms-helpdesk.ncas.ac.uk/t/porting-ancillary-suite-to-archer2/1510 "2024-08-29T10:17:04Z")
Hi, Further to our conversation here (see thread dated 3 July), I have now ascertained from Monsoon2 that they cannot retrieve my existing suite (u-ar826) and that there is no alternative. I am therefore now working wi… --- ## [ANCIL\_ANTS failing](https://cms-helpdesk.ncas.ac.uk/t/ancil-ants-failing/1017)
**Author:** [@MYoshioka](https://cms-helpdesk.ncas.ac.uk/u/MYoshioka)\ **Replies:** 3\ **Last updated:** [9 June 2023 08:34 UTC](https://cms-helpdesk.ncas.ac.uk/t/ancil-ants-failing/1017 "2023-06-09T08:34:17Z")
I’m trying to run a copy of my own UM job that ran OK a couple of months ago. The suite id is u-cx568, and it is vn11.9 nesting suite. I start with what I have done so far and add some notes for future reference. My que… --- ## [Segmentation error when using xancil to create smow ancillary](https://cms-helpdesk.ncas.ac.uk/t/segmentation-error-when-using-xancil-to-create-smow-ancillary/1296)
**Author:** [@jtalib](https://cms-helpdesk.ncas.ac.uk/u/jtalib)\ **Replies:** 12\ **Last updated:** [13 February 2024 09:54 UTC](https://cms-helpdesk.ncas.ac.uk/t/segmentation-error-when-using-xancil-to-create-smow-ancillary/1296 "2024-02-13T09:54:00Z")
Hi NCAS CMS, I’m trying to create a global smow ancillary file, however when I run xancil on the following job, /work/n02/n02/jostal/prescribed\_SM\_files/initial\_MO\_SMC/smow\_initial\_20210409T0000Z.job, I get a segmentati… --- ## [New ancillaries for future continuation run, Halos, NaNs in error term in BiCGstab](https://cms-helpdesk.ncas.ac.uk/t/new-ancillaries-for-future-continuation-run-halos-nans-in-error-term-in-bicgstab/528)
**Author:** [@pmcguire](https://cms-helpdesk.ncas.ac.uk/u/pmcguire)\ **Replies:** 3\ **Last updated:** [5 April 2022 15:56 UTC](https://cms-helpdesk.ncas.ac.uk/t/new-ancillaries-for-future-continuation-run-halos-nans-in-error-term-in-bicgstab/528 "2022-04-05T15:56:31Z")
Hi CMS Helpdesk: I have two ARCHER2 suites (u-cm922, u-cm923) that are continuation future runs of previous suites that ended on 20150101. They have different ancillaries for sea ice, SSTs, ozone, and aerosols than the … --- ## [Replanca: pp headers on ancillary file do not match](https://cms-helpdesk.ncas.ac.uk/t/replanca-pp-headers-on-ancillary-file-do-not-match/524)
**Author:** [@pmcguire](https://cms-helpdesk.ncas.ac.uk/u/pmcguire)\ **Replies:** 4\ **Last updated:** [1 April 2022 10:38 UTC](https://cms-helpdesk.ncas.ac.uk/t/replanca-pp-headers-on-ancillary-file-do-not-match/524 "2022-04-01T10:38:04Z")
Hi CMS Helpdesk: I am getting this error message for this suite u-cm245 on ARCHER2 after running from 1949 to 2014. It crashes during the December month of 2014. I had previously run a predecessor suite (u-cl527) with … --- ## [ANTS on JASMIN](https://cms-helpdesk.ncas.ac.uk/t/ants-on-jasmin/488)
**Author:** [@pmcguire](https://cms-helpdesk.ncas.ac.uk/u/pmcguire)\ **Replies:** 5\ **Last updated:** [22 February 2022 18:39 UTC](https://cms-helpdesk.ncas.ac.uk/t/ants-on-jasmin/488 "2022-02-22T18:39:02Z")
Good morning Patrick I wonder if you might be able to help me with tracking down status of ANTS on JASMIN. I discovered these instructions, but afraid I failed at step 5 (i.e. python pointing to your path). In any ca… --- ## [Provenance of global WFDEI 0.5deg Brooks & Corey soil ancillaries for JULES](https://cms-helpdesk.ncas.ac.uk/t/provenance-of-global-wfdei-0-5deg-brooks-corey-soil-ancillaries-for-jules/395)
**Author:** [@mtodt](https://cms-helpdesk.ncas.ac.uk/u/mtodt)\ **Replies:** 4\ **Last updated:** [14 January 2022 12:51 UTC](https://cms-helpdesk.ncas.ac.uk/t/provenance-of-global-wfdei-0-5deg-brooks-corey-soil-ancillaries-for-jules/395 "2022-01-14T12:51:02Z")
Hi Patrick, Omar, The suites I used \[for my JULES simulations\] are based on one of Omar’s that he shared with me. I want to mention the soil ancillaries in the paper, but I’m unsure which ones I’m actually using. I use … --- ## [Using xancil and xconv to create timeslice ancillary files](https://cms-helpdesk.ncas.ac.uk/t/using-xancil-and-xconv-to-create-timeslice-ancillary-files/311)
**Author:** [@James\_Weber](https://cms-helpdesk.ncas.ac.uk/u/James_Weber)\ **Replies:** 11\ **Last updated:** [18 November 2021 09:13 UTC](https://cms-helpdesk.ncas.ac.uk/t/using-xancil-and-xconv-to-create-timeslice-ancillary-files/311 "2021-11-18T09:13:22Z")
Hi, I’m trying to create a 2050 timeslice ancillary for land cover from the SSP370 model derived land cover ancil file on Archer2 but I’m having some trouble using xancil0.58. On Archer 2 I copied the model-derived anc… --- ## [Zhang & Schaap Soil Ancillary files with SoilGrids](https://cms-helpdesk.ncas.ac.uk/t/zhang-schaap-soil-ancillary-files-with-soilgrids/314)
**Author:** [@mtodt](https://cms-helpdesk.ncas.ac.uk/u/mtodt)\ **Replies:** 6\ **Last updated:** [17 November 2021 13:39 UTC](https://cms-helpdesk.ncas.ac.uk/t/zhang-schaap-soil-ancillary-files-with-soilgrids/314 "2021-11-17T13:39:08Z")
Hi Patrick, I am setting up a global JULES run with WFDEI and want to use the Zhang & Schaap soil ancillary. I found the most recent file (based on time stamp) as: /gws/nopw/j04/ncas\_generic/users/pmcguire/ants/soil\_an…