# \#orca **URL:** https://nemo-ocean.discourse.group/tag/orca/91.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) --- ## [\[v5.0.x\] bug in the execution of iom\_init in ORCA2\_ICE\_PISCES and X3\_ORCA2\_ICE\_PISCES](https://nemo-ocean.discourse.group/t/v5-0-x-bug-in-the-execution-of-iom-init-in-orca2-ice-pisces-and-x3-orca2-ice-pisces/1047)
**Author:** [@vsciortino](https://nemo-ocean.discourse.group/u/vsciortino)\ **Replies:** 0\ **Last updated:** [17 September 2026 09:18 UTC](https://nemo-ocean.discourse.group/t/v5-0-x-bug-in-the-execution-of-iom-init-in-orca2-ice-pisces-and-x3-orca2-ice-pisces/1047 "2026-09-17T09:18:36Z")
I compiled ORCA2\_ICE\_PISCES using the Intel OneAPI compilers 2024.1.0 on Leonardo CINECA, and in particular “mpiifx”; I used these flags in the cpp\_ORCA2\_ICE\_PISCES.fcm bld::tool::fppkeys key\_si3 key\_top key\_xios key\_… --- ## [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… --- ## [Help to find grids ORCA025 and ORCA12](https://nemo-ocean.discourse.group/t/help-to-find-grids-orca025-and-orca12/536)
**Author:** [@elsy](https://nemo-ocean.discourse.group/u/elsy)\ **Replies:** 8\ **Last updated:** [17 April 2026 12:40 UTC](https://nemo-ocean.discourse.group/t/help-to-find-grids-orca025-and-orca12/536 "2026-04-17T12:40:37Z")
Dear all, I tried to download the ORCA025 and ORCA12 grids, but I couldn’t find them anywhere online. Could you please help me by telling me where I can find these files to download or whom I can ask for them? Thank you… --- ## [North fold bug? Artefact along north fold in sea ice variables](https://nemo-ocean.discourse.group/t/north-fold-bug-artefact-along-north-fold-in-sea-ice-variables/972)
**Author:** [@jraylmer](https://nemo-ocean.discourse.group/u/jraylmer)\ **Replies:** 15\ **Last updated:** [17 April 2026 10:12 UTC](https://nemo-ocean.discourse.group/t/north-fold-bug-artefact-along-north-fold-in-sea-ice-variables/972 "2026-04-17T10:12:01Z")
I run ORCA2-ICE simulations and often see artefacts in output variables along the grid cells where north-folding occurs. It sometimes takes several years before it appears, depending on the forcing and namelist settings.… --- ## [Looking for the exact ORCA025.L75 static/grid files consistent with ORAS5](https://nemo-ocean.discourse.group/t/looking-for-the-exact-orca025-l75-static-grid-files-consistent-with-oras5/1002)
**Author:** [@toto](https://nemo-ocean.discourse.group/u/toto)\ **Replies:** 1\ **Last updated:** [16 March 2026 10:21 UTC](https://nemo-ocean.discourse.group/t/looking-for-the-exact-orca025-l75-static-grid-files-consistent-with-oras5/1002 "2026-03-16T10:21:24Z")
Hi everyone! I am trying to compute AMOC-related diagnostics from ORAS5 on the native 0.25° grid, and I am currently stuck on identifying the correct static/grid files that should be used together with it. From the ECMW… --- ## [Get ORCA025 coordinate file](https://nemo-ocean.discourse.group/t/get-orca025-coordinate-file/932)
**Author:** [@laetis](https://nemo-ocean.discourse.group/u/laetis)\ **Replies:** 2\ **Last updated:** [6 March 2026 16:22 UTC](https://nemo-ocean.discourse.group/t/get-orca025-coordinate-file/932 "2026-03-06T16:22:14Z")
Hi, I am looking for the coordinate file for ORCA025 configuration. Following the recommendation I found on this forum, I tried both on https://gws-access.ceda.ac.uk/public/nemo/runs/ and https://ige-meom-opendap.univ-… --- ## [Agrif setup with eOrca 1 configuration](https://nemo-ocean.discourse.group/t/agrif-setup-with-eorca-1-configuration/996)
**Author:** [@francesco.tuccia](https://nemo-ocean.discourse.group/u/francesco.tuccia)\ **Replies:** 1\ **Last updated:** [6 March 2026 14:23 UTC](https://nemo-ocean.discourse.group/t/agrif-setup-with-eorca-1-configuration/996 "2026-03-06T14:23:49Z")
Good afternoon everyone, I am trying to set up an AGRIF zoom in the eORCA1 configuration that I usually run, but I am facing several problems. I am following the Nemo AGRIF User-guide. In case you want to try to reprodu… --- ## [How to make the subbasins.nc file for NEMO 4.2.2?](https://nemo-ocean.discourse.group/t/how-to-make-the-subbasins-nc-file-for-nemo-4-2-2/861)
**Author:** [@joakim](https://nemo-ocean.discourse.group/u/joakim)\ **Replies:** 4\ **Last updated:** [21 November 2025 13:40 UTC](https://nemo-ocean.discourse.group/t/how-to-make-the-subbasins-nc-file-for-nemo-4-2-2/861 "2025-11-21T13:40:40Z")
Good morning I’m setting up a new configuration with NEMO 4.2.2 and generating the domain\_cfg.nc with the DOMAINcfg tool. So far so good, but I’m missing the subbasins.nc file needed to compute zonal means and MOC for t… --- ## [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… --- ## [Horizontal zooms in NEMO 4.0.x](https://nemo-ocean.discourse.group/t/horizontal-zooms-in-nemo-4-0-x/893)
**Author:** [@tmwilder](https://nemo-ocean.discourse.group/u/tmwilder)\ **Replies:** 7\ **Last updated:** [16 May 2025 09:49 UTC](https://nemo-ocean.discourse.group/t/horizontal-zooms-in-nemo-4-0-x/893 "2025-05-16T09:49:50Z")
I am trying to output a horizontal subdomain rather than the entire global output. I have modified domain\_def.xml and grid\_def.xml: \ \ **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… --- ## [Compiling NEMO 4.2.2 with Intel compilers version 2024](https://nemo-ocean.discourse.group/t/compiling-nemo-4-2-2-with-intel-compilers-version-2024/733)
**Author:** [@joakim](https://nemo-ocean.discourse.group/u/joakim)\ **Replies:** 1\ **Last updated:** [5 August 2024 07:28 UTC](https://nemo-ocean.discourse.group/t/compiling-nemo-4-2-2-with-intel-compilers-version-2024/733 "2024-08-05T07:28:01Z")
Good afternoon I’m trying to compile NEMO 4.2.2 on a machine that only has the latest Intel compilers (v 2024.2). With the new versions, the names of the compilers have changed as follows: icc → icx ifort → ifx As I … --- ## [Configuration crashes for new OASIS-MCT 4.0: malloc(): memory corruption (fast)](https://nemo-ocean.discourse.group/t/configuration-crashes-for-new-oasis-mct-4-0-malloc-memory-corruption-fast/715)
**Author:** [@Tronje](https://nemo-ocean.discourse.group/u/Tronje)\ **Replies:** 3\ **Last updated:** [1 July 2024 10:19 UTC](https://nemo-ocean.discourse.group/t/configuration-crashes-for-new-oasis-mct-4-0-malloc-memory-corruption-fast/715 "2024-07-01T10:19:18Z")
Dear all, I am experiencing issues running a nested NEMO3.6 simulation coupled with ECHAM-6.3.05p2 via OASIS3-MCT 4.0. For output, we are using XIOS2.5 versions r1910 and r2497. We have upgraded from OASIS3-MCT 3.6 to a… --- ## [DELAY\_fwb, Barotropic mode](https://nemo-ocean.discourse.group/t/delay-fwb-barotropic-mode/714)
**Author:** [@elsy](https://nemo-ocean.discourse.group/u/elsy)\ **Replies:** 2\ **Last updated:** [28 June 2024 10:07 UTC](https://nemo-ocean.discourse.group/t/delay-fwb-barotropic-mode/714 "2024-06-28T10:07:41Z")
Hi everyone, I’m doing a yearly barotropic simulation and for my monthly restart file I don’t see the “DELAY\_fwb” variable. and for my next year simulation the ocean.output says “iom\_nf90\_chkatt: no DELAY\_fwb attribute f… --- ## [How small are the "large water bodies" that NEMO can simulate](https://nemo-ocean.discourse.group/t/how-small-are-the-large-water-bodies-that-nemo-can-simulate/652)
**Author:** [@nick.heavens-cgg](https://nemo-ocean.discourse.group/u/nick.heavens-cgg)\ **Replies:** 2\ **Last updated:** [23 May 2024 10:49 UTC](https://nemo-ocean.discourse.group/t/how-small-are-the-large-water-bodies-that-nemo-can-simulate/652 "2024-05-23T10:49:42Z")
I am trying to refine a global coupled model I have developed. Somewhere in one of the NEMO manuals it says, " When a global ocean is coupled to an atmospheric model it is better to represent all large water bodies (e.… --- ## [Confusion about SI units for "sn\_slp"(mean seal level pressure) in bulk configuration](https://nemo-ocean.discourse.group/t/confusion-about-si-units-for-sn-slp-mean-seal-level-pressure-in-bulk-configuration/641)
**Author:** [@elsy](https://nemo-ocean.discourse.group/u/elsy)\ **Replies:** 1\ **Last updated:** [13 March 2024 16:08 UTC](https://nemo-ocean.discourse.group/t/confusion-about-si-units-for-sn-slp-mean-seal-level-pressure-in-bulk-configuration/641 "2024-03-13T16:08:19Z")
Hello everyone, I am a bit confused about the units that should be used for the variable “sn\_slp” defined in “namsbc\_blk” because in the NEMOv4.0.x manual it says that “sn\_slp=slp : mean sea level pressure” should be in … --- ## [Information regarding the ORCA 2 degree grid](https://nemo-ocean.discourse.group/t/information-regarding-the-orca-2-degree-grid/638)
**Author:** [@whuiskamp](https://nemo-ocean.discourse.group/u/whuiskamp)\ **Replies:** 2\ **Last updated:** [7 March 2024 15:03 UTC](https://nemo-ocean.discourse.group/t/information-regarding-the-orca-2-degree-grid/638 "2024-03-07T15:03:31Z")
Hi everyone, I am currently working with the people at NCAR to develop new grid configurations for MOM6 (bear with me), however their preferred grid generation workflow is to use ORCA tools. On that note, does anyone ha… --- ## [How to make the input files for nemo?](https://nemo-ocean.discourse.group/t/how-to-make-the-input-files-for-nemo/620)
**Author:** [@Zhenqian](https://nemo-ocean.discourse.group/u/Zhenqian)\ **Replies:** 7\ **Last updated:** [1 March 2024 15:58 UTC](https://nemo-ocean.discourse.group/t/how-to-make-the-input-files-for-nemo/620 "2024-03-01T15:58:12Z")
Hi, I am using the EC-Earth to run the deep-time simulations, i would like to know how to change the mesh grids to fit the new land-sea mask? Thanks! Best, Zhenqian --- ## [Internal wave-driven mixing parameterization input fields changed](https://nemo-ocean.discourse.group/t/internal-wave-driven-mixing-parameterization-input-fields-changed/589)
**Author:** [@rabbit](https://nemo-ocean.discourse.group/u/rabbit)\ **Replies:** 2\ **Last updated:** [16 November 2023 12:18 UTC](https://nemo-ocean.discourse.group/t/internal-wave-driven-mixing-parameterization-input-fields-changed/589 "2023-11-16T12:18:45Z")
Tidal mixing parameterization (activated with ln\_zdfiwm = .true.; input files prescribed in &namzdf\_iwm) has been reworked in v4.2. In previous versions it required 5 input fields (usually provided as 5 NetCDF files: m… --- ## [Input data Format](https://nemo-ocean.discourse.group/t/input-data-format/564)
**Author:** [@elsy](https://nemo-ocean.discourse.group/u/elsy)\ **Replies:** 1\ **Last updated:** [29 September 2023 06:58 UTC](https://nemo-ocean.discourse.group/t/input-data-format/564 "2023-09-29T06:58:16Z")
Hi, I’m new in NEMO and try to run the storm surge in global domain using the ERA5 forcing, this data have in the description the scale\_factor and add\_offset. My question is, I want to know if the model use this descript… --- ## [Help to use module "diaar5"](https://nemo-ocean.discourse.group/t/help-to-use-module-diaar5/552)
**Author:** [@elsy](https://nemo-ocean.discourse.group/u/elsy)\ **Replies:** 1\ **Last updated:** [10 August 2023 12:04 UTC](https://nemo-ocean.discourse.group/t/help-to-use-module-diaar5/552 "2023-08-10T12:04:08Z")
Assistance with “key\_diaar5,” my intention is to simulate sea level using version 4.0.6 of NEMO. In the manual, they describe the “diaar5” module; however, they do not indicate whether this version includes this “key.” I… --- ## [Duplicated north cells with jperio == 4](https://nemo-ocean.discourse.group/t/duplicated-north-cells-with-jperio-4/504)
**Author:** [@cpelletier](https://nemo-ocean.discourse.group/u/cpelletier)\ **Replies:** 4\ **Last updated:** [12 May 2023 12:37 UTC](https://nemo-ocean.discourse.group/t/duplicated-north-cells-with-jperio-4/504 "2023-05-12T12:37:04Z")
Hi, On our eORCA025 config, NEMO v4.0.1 with jperio == 4. The first two and last two columns (x dims) are the same due to east-west cyclicity. Then, my understanding is that each wet cell on the j == jpjglo row has exa… --- ## [Where can i find predefined grid ORCA1 file?](https://nemo-ocean.discourse.group/t/where-can-i-find-predefined-grid-orca1-file/475)
**Author:** [@xzhahahah](https://nemo-ocean.discourse.group/u/xzhahahah)\ **Replies:** 0\ **Last updated:** [7 April 2023 03:54 UTC](https://nemo-ocean.discourse.group/t/where-can-i-find-predefined-grid-orca1-file/475 "2023-04-07T03:54:06Z")
Dear all, I need ORCA1 file to mask out Atlantic and rotate ocean velocity but I cound not find it anywhere online. I can find ORCA025 though. Any idea where i can find this file or how can I create it ? Thanks very… --- ## ["multiple definition" problem in compiling with key\_agrif](https://nemo-ocean.discourse.group/t/multiple-definition-problem-in-compiling-with-key-agrif/424)
**Author:** [@lchi](https://nemo-ocean.discourse.group/u/lchi)\ **Replies:** 1\ **Last updated:** [14 January 2023 03:18 UTC](https://nemo-ocean.discourse.group/t/multiple-definition-problem-in-compiling-with-key-agrif/424 "2023-01-14T03:18:24Z")
Hi, I am trying to compile a nested configuration of ORCA2\_LIM with key\_agrif in NEMO v3.6. However, it ended up with multiple definition messages which failed the compilation: -\>Make: start fcm\_internal load:C con… --- ## [QG Leith viscosity implementation](https://nemo-ocean.discourse.group/t/qg-leith-viscosity-implementation/377)
**Author:** [@tmwilder](https://nemo-ocean.discourse.group/u/tmwilder)\ **Replies:** 7\ **Last updated:** [9 January 2023 14:28 UTC](https://nemo-ocean.discourse.group/t/qg-leith-viscosity-implementation/377 "2023-01-09T14:28:30Z")
Hi all, I am currently attempting to implement the QG Leith viscous coefficient in nemo v4.0.4. The choice of v4.0.4 is because there is an ORCA025 setup ready to go, which is not yet the case for v4.2. I am also new to… --- ## [ORCA partial vertical grid](https://nemo-ocean.discourse.group/t/orca-partial-vertical-grid/389)
**Author:** [@dramauh](https://nemo-ocean.discourse.group/u/dramauh)\ **Replies:** 0\ **Last updated:** [8 November 2022 03:40 UTC](https://nemo-ocean.discourse.group/t/orca-partial-vertical-grid/389 "2022-11-08T03:40:37Z")
Dear Community, I am closing the Arctic volume budget with the transports and the surface freshwater input (precipitation, runoff, melting, evaporation) from CMIP6 EC-Earth3 (NEMO3.6) model data. I used the variables um… --- ## [Rotate u and v model grid to regular lat lon grid](https://nemo-ocean.discourse.group/t/rotate-u-and-v-model-grid-to-regular-lat-lon-grid/384)
**Author:** [@dramauh](https://nemo-ocean.discourse.group/u/dramauh)\ **Replies:** 2\ **Last updated:** [29 October 2022 06:02 UTC](https://nemo-ocean.discourse.group/t/rotate-u-and-v-model-grid-to-regular-lat-lon-grid/384 "2022-10-29T06:02:29Z")
Dear Community, I would like to rotate the velocity components to the regular lat lon grid. I think I need to use this expression u\_{latlon} = u\_{rot} \\cos \\alpha - v\_{rot} \\sin \\alpha \\\\ v\_{latlon} = u\_{rot} \\sin \\a… --- ## [Hourly output when running ORCA025](https://nemo-ocean.discourse.group/t/hourly-output-when-running-orca025/348)
**Author:** [@fcocetta](https://nemo-ocean.discourse.group/u/fcocetta)\ **Replies:** 3\ **Last updated:** [25 August 2022 14:19 UTC](https://nemo-ocean.discourse.group/t/hourly-output-when-running-orca025/348 "2022-08-25T14:19:49Z")
Dear all, I run experiments with ORCA025 configuration and I have recently faced problems when setting “1h” as output frequency (both with instantaneous and average output values). The simulation is OK and no problems … --- ## [\`PiDIC\` variable and weights file not found](https://nemo-ocean.discourse.group/t/pidic-variable-and-weights-file-not-found/314)
**Author:** [@nty](https://nemo-ocean.discourse.group/u/nty)\ **Replies:** 5\ **Last updated:** [25 July 2022 17:18 UTC](https://nemo-ocean.discourse.group/t/pidic-variable-and-weights-file-not-found/314 "2022-07-25T17:18:15Z")
Hi, I have setup the ORCA2\_ICE\_PISCES workload for v4.2.0, but get an error during the run. ===\>\>\> : E R R O R iom\_varid, file: ./data\_DIC\_nomask.nc, var: PiDIC not found ===\>\>\> : E R R O R iom… --- ## [\[v4.2.x\] How to remap NetCDF files from source grid to target grid](https://nemo-ocean.discourse.group/t/v4-2-x-how-to-remap-netcdf-files-from-source-grid-to-target-grid/276)
**Author:** [@ukocean](https://nemo-ocean.discourse.group/u/ukocean)\ **Replies:** 3\ **Last updated:** [12 April 2022 12:01 UTC](https://nemo-ocean.discourse.group/t/v4-2-x-how-to-remap-netcdf-files-from-source-grid-to-target-grid/276 "2022-04-12T12:01:30Z")
Hi all, There are 3 files in NEMO 4.2: mixing\_power\_pyc.nc, mixing\_power\_bot.nc and mixing\_power\_cri.nc that are not explicitly listed in any namelist under file name. I’d like to map those R2 files to R05 files, but h… [Next page](https://nemo-ocean.discourse.group/tag/orca/91.md?match_all_tags=true&page=1&tags%5B%5D=orca)