# Uncategorized **URL:** https://nemo-ocean.discourse.group/c/uncategorized/1.md [Latest](https://nemo-ocean.discourse.group/latest.md) · [Categories](https://nemo-ocean.discourse.group/categories.md) · [Tags](https://nemo-ocean.discourse.group/tags.md) --- ## [Running AGRIF with tides (Nemo 4.2.2)](https://nemo-ocean.discourse.group/t/running-agrif-with-tides-nemo-4-2-2/1041)
**Author:** [@robinson](https://nemo-ocean.discourse.group/u/robinson)\ **Replies:** 2\ **Last updated:** [6 August 2026 12:31 UTC](https://nemo-ocean.discourse.group/t/running-agrif-with-tides-nemo-4-2-2/1041 "2026-08-06T12:31:57Z")
Dear all, My AGRIF nest crashes, not immediately, but after a while, whatever I do if I run with tides. Using Nemo 4.2.2 The crash occurs in the barotropic mode, and generates NaNs quickly all over the place. Based on… --- ## [2D and 3D bounday condition](https://nemo-ocean.discourse.group/t/2d-and-3d-bounday-condition/1037)
**Author:** [@sennevilles](https://nemo-ocean.discourse.group/u/sennevilles)\ **Replies:** 6\ **Last updated:** [28 July 2026 18:49 UTC](https://nemo-ocean.discourse.group/t/2d-and-3d-bounday-condition/1037 "2026-07-28T18:49:16Z")
Hi, I computed open boundary conditions for my child domain (using VVL) from a parent model (also using VVL). I ran a first simulation (simulation 1) using ln\_full\_vel = .true. and providing bn\_u3d and bn\_v3d. Then, fo… --- ## [Compatibility between the ORCA2\_OFF\_v5.0.0.tar.gz input files and the namelist\_cfg for the ORCA2\_OFF\_TRC reference case](https://nemo-ocean.discourse.group/t/compatibility-between-the-orca2-off-v5-0-0-tar-gz-input-files-and-the-namelist-cfg-for-the-orca2-off-trc-reference-case/1012)
**Author:** [@baptiste](https://nemo-ocean.discourse.group/u/baptiste)\ **Replies:** 1\ **Last updated:** [16 July 2026 13:59 UTC](https://nemo-ocean.discourse.group/t/compatibility-between-the-orca2-off-v5-0-0-tar-gz-input-files-and-the-namelist-cfg-for-the-orca2-off-trc-reference-case/1012 "2026-07-16T13:59:53Z")
I downloaded ORCA2\_OFF\_v5.0.0.tar.gz from NEMO SETTE input files delivered through Jasmin . Then, when I use these files for the reference configuration ORCA2\_OFF\_TRC, ./nemo crash with these E R R O R s: iom\_varid, fil… --- ## [SI³: EAP rheology broken? Segmentation fault with ln\_rhg\_EAP = .TRUE](https://nemo-ocean.discourse.group/t/si-eap-rheology-broken-segmentation-fault-with-ln-rhg-eap-true/1035)
**Author:** [@jraylmer](https://nemo-ocean.discourse.group/u/jraylmer)\ **Replies:** 0\ **Last updated:** [24 June 2026 09:56 UTC](https://nemo-ocean.discourse.group/t/si-eap-rheology-broken-segmentation-fault-with-ln-rhg-eap-true/1035 "2026-06-24T09:56:14Z")
There seems to be a technical issue with the EAP rheology scheme. When activating this scheme in a basic reference configuration with no code modifications, I am getting a segmentation fault when activating this scheme. … --- ## [ORCA12 grid -\> help to find](https://nemo-ocean.discourse.group/t/orca12-grid-help-to-find/1032)
**Author:** [@izanovicki](https://nemo-ocean.discourse.group/u/izanovicki)\ **Replies:** 0\ **Last updated:** [20 June 2026 08:38 UTC](https://nemo-ocean.discourse.group/t/orca12-grid-help-to-find/1032 "2026-06-20T08:38:20Z")
I’m looking for the ORCA12 domain\_cfg.nc (or coordinates.nc/mesh\_mask.nc) corresponding to the Mercator GLORYS12 reanalysis (NEMO 3.1 ORCA12 50 levels). The former CEDA repository seems unavailable. Is there any mirror o… --- ## [Inexplicable XIOS troubles](https://nemo-ocean.discourse.group/t/inexplicable-xios-troubles/1028)
**Author:** [@francesco.tuccia](https://nemo-ocean.discourse.group/u/francesco.tuccia)\ **Replies:** 1\ **Last updated:** [16 June 2026 09:06 UTC](https://nemo-ocean.discourse.group/t/inexplicable-xios-troubles/1028 "2026-06-16T09:06:46Z")
Good afternoon to all, This is a more of a long shot than a real help request, and I am sorry if this post does not respect the formats of this community, but me and a colleague are experiencing troubles with XIOS sinc… --- ## [Question about the wind-stress module calculation in sbcflx.F90](https://nemo-ocean.discourse.group/t/question-about-the-wind-stress-module-calculation-in-sbcflx-f90/1027)
**Author:** [@qtqw](https://nemo-ocean.discourse.group/u/qtqw)\ **Replies:** 1\ **Last updated:** [15 June 2026 07:23 UTC](https://nemo-ocean.discourse.group/t/question-about-the-wind-stress-module-calculation-in-sbcflx-f90/1027 "2026-06-15T07:23:55Z")
In my version of NEMO 4.6 I noticed the following line in NEMOGCM/src/OCE/SBC/sbcflx.F90: zmod = 0.5\_wp \* SQRT( ztx \* ztx + zty \* zty ) \* tmask(ji,jj,1) where ztx and zty are the zonal and meridional wind-stress compon… --- ## [GLS bug in -b main (Missing Validation / Incomplete Input Checking)](https://nemo-ocean.discourse.group/t/gls-bug-in-b-main-missing-validation-incomplete-input-checking/1006)
**Author:** [@GODZILLA](https://nemo-ocean.discourse.group/u/GODZILLA)\ **Replies:** 1\ **Last updated:** [4 May 2026 18:42 UTC](https://nemo-ocean.discourse.group/t/gls-bug-in-b-main-missing-validation-incomplete-input-checking/1006 "2026-05-04T18:42:46Z")
Dear all, I working before on FVCOM/ADCIRC model. currently i have some planning to run NEMO model for Project work (NEMO+some BGC). Before starting the simulation i compile and run (small test with a few little steps).… --- ## [NEMO SSL certificate has expired 15/07/2025](https://nemo-ocean.discourse.group/t/nemo-ssl-certificate-has-expired-15-07-2025/929)
**Author:** [@richardhill](https://nemo-ocean.discourse.group/u/richardhill)\ **Replies:** 4\ **Last updated:** [1 May 2026 14:45 UTC](https://nemo-ocean.discourse.group/t/nemo-ssl-certificate-has-expired-15-07-2025/929 "2026-05-01T14:45:08Z")
The NEMO SSL certificate has expired today, causing errors when trying to access the NEMO git repository: 13:fetch remote: “fatal: unable to access ‘https://forge.nemo-ocean.eu/nemo/nemo.git/’: SSL certificate problem: … --- ## [Running AGRIF+TOP+Biogeochemistry](https://nemo-ocean.discourse.group/t/running-agrif-top-biogeochemistry/1004)
**Author:** [@robinson](https://nemo-ocean.discourse.group/u/robinson)\ **Replies:** 1\ **Last updated:** [23 March 2026 08:54 UTC](https://nemo-ocean.discourse.group/t/running-agrif-top-biogeochemistry/1004 "2026-03-23T08:54:14Z")
Dear all, It’s all in the title. Is it possible to run Agrif with TOP, and a biogeochemical model ? Takk for hjelp, Robinson --- ## [Nutrient Fluxes in PISCES](https://nemo-ocean.discourse.group/t/nutrient-fluxes-in-pisces/985)
**Author:** [@robinson](https://nemo-ocean.discourse.group/u/robinson)\ **Replies:** 4\ **Last updated:** [6 March 2026 09:57 UTC](https://nemo-ocean.discourse.group/t/nutrient-fluxes-in-pisces/985 "2026-03-06T09:57:54Z")
Dear All, I am trying to run PISCES in a regional setting, with OBCs, and nutrient loads from runoff. I found this files: https://gws-access.jasmin.ac.uk/public/nemo/sette\_inputs/index\_v4.html#:~:text=wget%20%22https%… --- ## [NEMO output in Parcels v4: Request for test datasets and questions about metadata](https://nemo-ocean.discourse.group/t/nemo-output-in-parcels-v4-request-for-test-datasets-and-questions-about-metadata/979)
**Author:** [@VeckoTheGecko](https://nemo-ocean.discourse.group/u/VeckoTheGecko)\ **Replies:** 1\ **Last updated:** [29 January 2026 13:36 UTC](https://nemo-ocean.discourse.group/t/nemo-output-in-parcels-v4-request-for-test-datasets-and-questions-about-metadata/979 "2026-01-29T13:36:07Z")
Hi NEMO community, I am working on Parcels v4 alongside Prof. Erik van Sebille. We want to support a wide range of hydrodynamic models in our software, and are working to provide ingestion code converting NEMO output to… --- ## [Agrif\_create\_restart in Nemo 4.2.2](https://nemo-ocean.discourse.group/t/agrif-create-restart-in-nemo-4-2-2/976)
**Author:** [@robinson](https://nemo-ocean.discourse.group/u/robinson)\ **Replies:** 0\ **Last updated:** [6 January 2026 16:21 UTC](https://nemo-ocean.discourse.group/t/agrif-create-restart-in-nemo-4-2-2/976 "2026-01-06T16:21:20Z")
Dear all, Is anyone using agrif\_create\_restart in Nemo 4.2.2 ? It compiles, it runs, but I only get 0 for all the fields in the child restart file. Thanks for your help, Robinson --- ## [Nan when calculating solar radiation absorption](https://nemo-ocean.discourse.group/t/nan-when-calculating-solar-radiation-absorption/975)
**Author:** [@Pysh](https://nemo-ocean.discourse.group/u/Pysh)\ **Replies:** 0\ **Last updated:** [23 December 2025 09:33 UTC](https://nemo-ocean.discourse.group/t/nan-when-calculating-solar-radiation-absorption/975 "2025-12-23T09:33:24Z")
Hello! I encountered the following case while running a program version 4.2.3: In algorithm of the absorption of solar radiation in the CdN\_f\_LG15\_light function from the sbcblk\_algo\_ice\_cdn.F90 value of zfri (==at\_i\_b)… --- ## [AGRIF - Subnest processor map](https://nemo-ocean.discourse.group/t/agrif-subnest-processor-map/974)
**Author:** [@robinson](https://nemo-ocean.discourse.group/u/robinson)\ **Replies:** 8\ **Last updated:** [18 December 2025 06:02 UTC](https://nemo-ocean.discourse.group/t/agrif-subnest-processor-map/974 "2025-12-18T06:02:54Z")
Dear All, I’m trying to run AGRIF. With one child level (1\_ ), it runs fine. But i have problems with the processor map when trying to run a subnest (so a child in the child). I do not specify jpni/jpnj, at none of the… --- ## [Objects not beeing found by XIOS (NEMO5.0)](https://nemo-ocean.discourse.group/t/objects-not-beeing-found-by-xios-nemo5-0/925)
**Author:** [@Franziska](https://nemo-ocean.discourse.group/u/Franziska)\ **Replies:** 1\ **Last updated:** [16 December 2025 06:18 UTC](https://nemo-ocean.discourse.group/t/objects-not-beeing-found-by-xios-nemo5-0/925 "2025-12-16T06:18:42Z")
Hi, Note, I came across the below described issue before (see ticket) in a nested configuration, however, the “solution” doesn’t apply for my current configuration. I encounter errors with objects not beeing found by X… --- ## [Vertical diffusivity reaches huge values close to boundary of nested configuration](https://nemo-ocean.discourse.group/t/vertical-diffusivity-reaches-huge-values-close-to-boundary-of-nested-configuration/963)
**Author:** [@beth](https://nemo-ocean.discourse.group/u/beth)\ **Replies:** 3\ **Last updated:** [25 November 2025 14:39 UTC](https://nemo-ocean.discourse.group/t/vertical-diffusivity-reaches-huge-values-close-to-boundary-of-nested-configuration/963 "2025-11-25T14:39:38Z")
I have been having issues when running my nested model configuration while using the GLS vertical mixing scheme. The vertical diffusivity occasionally reaches huge values, and eventually blows up the model. Depending on … --- ## [Diadct.f90 problem](https://nemo-ocean.discourse.group/t/diadct-f90-problem/959)
**Author:** [@francesco.tuccia](https://nemo-ocean.discourse.group/u/francesco.tuccia)\ **Replies:** 1\ **Last updated:** [22 October 2025 10:54 UTC](https://nemo-ocean.discourse.group/t/diadct-f90-problem/959 "2025-10-22T10:54:57Z")
Good morning everyone, I am facing some problems setting up some transport sections using the diadct.f90 module. My section\_ijglobal.diadct file reads -68. -54.5 -60. -64.7 00 okstrpond noice ACC\_Drake\_Passag… --- ## [Is it possible to start NEMO at 12 UTC?](https://nemo-ocean.discourse.group/t/is-it-possible-to-start-nemo-at-12-utc/701)
**Author:** [@lowry389](https://nemo-ocean.discourse.group/u/lowry389)\ **Replies:** 8\ **Last updated:** [30 September 2025 10:24 UTC](https://nemo-ocean.discourse.group/t/is-it-possible-to-start-nemo-at-12-utc/701 "2025-09-30T10:24:19Z")
Hi, Generally NEMO starts running at 00 o’ clock. Now I want to set up a NEMO model for operational forecast starting from 12(UTC), is it possible? Rui --- ## [Coupling at AGRIF child grid level](https://nemo-ocean.discourse.group/t/coupling-at-agrif-child-grid-level/947)
**Author:** [@tgraham](https://nemo-ocean.discourse.group/u/tgraham)\ **Replies:** 2\ **Last updated:** [10 September 2025 13:34 UTC](https://nemo-ocean.discourse.group/t/coupling-at-agrif-child-grid-level/947 "2025-09-10T13:34:35Z")
Hi all, Over the next few years, we may wish to start developing coupled models with AGRIF nests. Can I confirm that at the moment, this is only possible at the parent grid level (i.e. the atmosphere doesn’t see the hig… --- ## [502 error when attempting to access the forge wiki](https://nemo-ocean.discourse.group/t/502-error-when-attempting-to-access-the-forge-wiki/946)
**Author:** [@rharel](https://nemo-ocean.discourse.group/u/rharel)\ **Replies:** 1\ **Last updated:** [9 September 2025 14:48 UTC](https://nemo-ocean.discourse.group/t/502-error-when-attempting-to-access-the-forge-wiki/946 "2025-09-09T14:48:58Z")
Hello, Just to let the sysadmins know: I’ve been getting a persistent 502 error trying to access https://forge.nemo-ocean.eu/nemo/nemo/-/wikis/home --- ## [River runoff units](https://nemo-ocean.discourse.group/t/river-runoff-units/923)
**Author:** [@qtqw](https://nemo-ocean.discourse.group/u/qtqw)\ **Replies:** 2\ **Last updated:** [3 July 2025 12:30 UTC](https://nemo-ocean.discourse.group/t/river-runoff-units/923 "2025-07-03T12:30:30Z")
Variable sn\_rnf (river runoff) in runoff.nc files has the unit kg/(m²s). How can I convert runoff from m³/s to kg/(m²s) ? --- ## [Updated parent grids in AGRIF configurations](https://nemo-ocean.discourse.group/t/updated-parent-grids-in-agrif-configurations/897)
**Author:** [@Franziska](https://nemo-ocean.discourse.group/u/Franziska)\ **Replies:** 20\ **Last updated:** [23 June 2025 07:28 UTC](https://nemo-ocean.discourse.group/t/updated-parent-grids-in-agrif-configurations/897 "2025-06-23T07:28:45Z")
Hi all, how exactly are updated parent grid(s) in AGRIF configurations defined and used in NEMO 5 and is it the same for NEMO 4.2.2? For different puposes (e.g. runoff distribution, restart masking) I used masks from m… --- ## [What could be the reason for a stp\_ctl: |ssh| \> 20 m error?](https://nemo-ocean.discourse.group/t/what-could-be-the-reason-for-a-stp-ctl-ssh-20-m-error/898)
**Author:** [@navajyoth](https://nemo-ocean.discourse.group/u/navajyoth)\ **Replies:** 5\ **Last updated:** [3 June 2025 14:42 UTC](https://nemo-ocean.discourse.group/t/what-could-be-the-reason-for-a-stp-ctl-ssh-20-m-error/898 "2025-06-03T14:42:42Z")
I am running a coupled model configuration (OpenIFS + NEMO 4.2 eORCA05.L75). I keep running into the error: stp\_ctl: |ssh| \> 20 m or |U| \> 10 m/s or S \<= 0 or S \>= 100 or NaN en counter in the tests kt 1 |ssh… --- ## [Files with lateral boundary conditions](https://nemo-ocean.discourse.group/t/files-with-lateral-boundary-conditions/903)
**Author:** [@qtqw](https://nemo-ocean.discourse.group/u/qtqw)\ **Replies:** 1\ **Last updated:** [27 May 2025 09:54 UTC](https://nemo-ocean.discourse.group/t/files-with-lateral-boundary-conditions/903 "2025-05-27T09:54:37Z")
I am trying to run NEMO with open boundaries, ln\_bdy = .true. I am going to use external boundary data, which means I have to create boundary files (bn\_ssh, bn\_u3d, bn\_v3d,…). Is there any examples of the boundary fil… --- ## [Running NEMO on EGI Resources](https://nemo-ocean.discourse.group/t/running-nemo-on-egi-resources/891)
**Author:** [@rsignell](https://nemo-ocean.discourse.group/u/rsignell)\ **Replies:** 1\ **Last updated:** [7 May 2025 15:58 UTC](https://nemo-ocean.discourse.group/t/running-nemo-on-egi-resources/891 "2025-05-07T15:58:36Z")
Any suggestions for how best to run NEMO on EGI Resources? I’m wondering about running Docker or Apptainer Containers, deploying HPC infrastructure like Magic Castle, or simply using a VM… --- ## [Potential Bug in trabbl?](https://nemo-ocean.discourse.group/t/potential-bug-in-trabbl/881)
**Author:** [@robinson](https://nemo-ocean.discourse.group/u/robinson)\ **Replies:** 0\ **Last updated:** [7 April 2025 07:32 UTC](https://nemo-ocean.discourse.group/t/potential-bug-in-trabbl/881 "2025-04-07T07:32:39Z")
Dear all, Not sure it is a bug, but why is the bottom density gradient in trabbl estimated only between bottom points in the case of nn\_bbl\_adv=2 ? For nn\_bbl\_adv=1 and for the diffusive case, it is not estimated betwe… --- ## [Improved BBL parameterisation?](https://nemo-ocean.discourse.group/t/improved-bbl-parameterisation/873)
**Author:** [@robinson](https://nemo-ocean.discourse.group/u/robinson)\ **Replies:** 0\ **Last updated:** [20 March 2025 18:54 UTC](https://nemo-ocean.discourse.group/t/improved-bbl-parameterisation/873 "2025-03-20T18:54:14Z")
Dear All, Based on this paper: https://link.springer.com/content/pdf/10.1023/A:1011520432200.pdf I am wondering whether the BBL parameterisations implemented in Nemo are actually totally physical. It does make sense … --- ## [Horizontal diffusion coefficients](https://nemo-ocean.discourse.group/t/horizontal-diffusion-coefficients/863)
**Author:** [@qtqw](https://nemo-ocean.discourse.group/u/qtqw)\ **Replies:** 1\ **Last updated:** [13 March 2025 19:45 UTC](https://nemo-ocean.discourse.group/t/horizontal-diffusion-coefficients/863 "2025-03-13T19:45:54Z")
I use NEMO 4.x with the options ln\_traldf\_blp = .true. ! bilaplacian operator ln\_dynldf\_blp = .true. ! bilaplacian operator In my case eddy coefficients of viscosity and diffusivity are ahm = 1/12 UvLv^3 aht =… --- ## [GEOMETRIC (or other eddy parameterisation) in eORCA025](https://nemo-ocean.discourse.group/t/geometric-or-other-eddy-parameterisation-in-eorca025/864)
**Author:** [@Franziska](https://nemo-ocean.discourse.group/u/Franziska)\ **Replies:** 0\ **Last updated:** [13 March 2025 15:03 UTC](https://nemo-ocean.discourse.group/t/geometric-or-other-eddy-parameterisation-in-eorca025/864 "2025-03-13T15:03:46Z")
Hi, we’re currently discussing on how to improve our simulations in eORCA025. So far we don’t use any eddy parameterisation but would like to try GEOMETRIC. Is there any experience with GEOMETRIC at 1/4° resolution, es… [Next page](https://nemo-ocean.discourse.group/c/uncategorized/1.md?page=1)