# v4.2.x **URL:** https://nemo-ocean.discourse.group/c/versions/v4-2-x/12.md?page=1 [Latest](https://nemo-ocean.discourse.group/latest.md) · [Categories](https://nemo-ocean.discourse.group/categories.md) · [Tags](https://nemo-ocean.discourse.group/tags.md) **Page:** 2 --- ## [Ice deposition (the inverse of sublimation) in coupled simulations](https://nemo-ocean.discourse.group/t/ice-deposition-the-inverse-of-sublimation-in-coupled-simulations/874)
**Author:** [@dringeisen](https://nemo-ocean.discourse.group/u/dringeisen)\ **Replies:** 6\ **Last updated:** [26 June 2025 21:08 UTC](https://nemo-ocean.discourse.group/t/ice-deposition-the-inverse-of-sublimation-in-coupled-simulations/874 "2025-06-26T21:08:32Z")
Hello, We have NEMO4.2 coupled to our in-house atmosphere through our in-house coupler. (CanAM, CanCPL) We are having some issues getting a realistic sea ice cover in coupled simulations, (our sea ice volume explodes 2… --- ## [Bug fix for 4.2.2 when halo size = 1 and wetting/drying activated](https://nemo-ocean.discourse.group/t/bug-fix-for-4-2-2-when-halo-size-1-and-wetting-drying-activated/913)
**Author:** [@stephanne](https://nemo-ocean.discourse.group/u/stephanne)\ **Replies:** 1\ **Last updated:** [17 June 2025 19:46 UTC](https://nemo-ocean.discourse.group/t/bug-fix-for-4-2-2-when-halo-size-1-and-wetting-drying-activated/913 "2025-06-17T19:46:43Z")
When wetting and drying is activated (ln\_wd\_dl = T and ln\_wd\_dl\_bc = T) and the halo size is set to one (nn\_hls = 1), artifacts are visible in the velocity fields at the edges of each single-cpu tile. Here’s a snapshot … --- ## [AGRIF handling of class declaration](https://nemo-ocean.discourse.group/t/agrif-handling-of-class-declaration/912)
**Author:** [@mhilt](https://nemo-ocean.discourse.group/u/mhilt)\ **Replies:** 0\ **Last updated:** [12 June 2025 09:48 UTC](https://nemo-ocean.discourse.group/t/agrif-handling-of-class-declaration/912 "2025-06-12T09:48:13Z")
Hi everyone, I’m doing some runs that use the FABM library for BGC model coupling in Nemo v4.2 (the BGC model in question being ERGOM). FABM-ERGOM is built independantly from nemo and linked to at compilation. In Nemo ,… --- ## [Issues in removing tracers advection in quasi-barotropic model (NEMO 4.2)](https://nemo-ocean.discourse.group/t/issues-in-removing-tracers-advection-in-quasi-barotropic-model-nemo-4-2/911)
**Author:** [@acgoglio](https://nemo-ocean.discourse.group/u/acgoglio)\ **Replies:** 5\ **Last updated:** [11 June 2025 13:25 UTC](https://nemo-ocean.discourse.group/t/issues-in-removing-tracers-advection-in-quasi-barotropic-model-nemo-4-2/911 "2025-06-11T13:25:28Z")
Hi all, I am developing a quasi-barotropic model with NEMO 4.2 (minimal vertical structure—e.g., top and bottom layers only—with z\* coordinates and partial steps, non-linear free surface, initialized with constant T and… --- ## [Discontinuity in AGRIF parent-child boundary in W-grid variables](https://nemo-ocean.discourse.group/t/discontinuity-in-agrif-parent-child-boundary-in-w-grid-variables/900)
**Author:** [@beth](https://nemo-ocean.discourse.group/u/beth)\ **Replies:** 9\ **Last updated:** [11 June 2025 12:39 UTC](https://nemo-ocean.discourse.group/t/discontinuity-in-agrif-parent-child-boundary-in-w-grid-variables/900 "2025-06-11T12:39:30Z")
Hi all, I am working on a new configuration of NEMO+AGRIF using NEMO 4.2.2. The model runs without problem and appears to be stable over a long time period, but I noticed that in the outputs, only in the variables on t… --- ## [Similations with different vertical mixing schemes and without convection parameterisations](https://nemo-ocean.discourse.group/t/similations-with-different-vertical-mixing-schemes-and-without-convection-parameterisations/906)
**Author:** [@luciag](https://nemo-ocean.discourse.group/u/luciag)\ **Replies:** 0\ **Last updated:** [30 May 2025 09:14 UTC](https://nemo-ocean.discourse.group/t/similations-with-different-vertical-mixing-schemes-and-without-convection-parameterisations/906 "2025-05-30T09:14:51Z")
Hello everyone, I would like to perform simulations using different vertical mixing schemes, but without activating any convection parameterisations (such as EVD or MFC). I turned off all convection parameterisations an… --- ## [AGRIF child abnormal behaviours at the boundaries](https://nemo-ocean.discourse.group/t/agrif-child-abnormal-behaviours-at-the-boundaries/520)
**Author:** [@ngrivault](https://nemo-ocean.discourse.group/u/ngrivault)\ **Replies:** 11\ **Last updated:** [29 April 2025 09:06 UTC](https://nemo-ocean.discourse.group/t/agrif-child-abnormal-behaviours-at-the-boundaries/520 "2025-04-29T09:06:08Z")
Hello everyone, I have set up a new AGRIF nest over our NORDIC domain, but I face some very odd behaviour at boundary with the parent that I cannot explain nor I understand how to fix. Before I detail the problem, ther… --- ## [MPI error while using the DOMAINcfg tool](https://nemo-ocean.discourse.group/t/mpi-error-while-using-the-domaincfg-tool/867)
**Author:** [@navajyoth](https://nemo-ocean.discourse.group/u/navajyoth)\ **Replies:** 3\ **Last updated:** [27 March 2025 14:36 UTC](https://nemo-ocean.discourse.group/t/mpi-error-while-using-the-domaincfg-tool/867 "2025-03-27T14:36:04Z")
I have been trying to create domain files for an eORCA05.L75 configuration for a while. While trying to run the DOMAINcfg tool, I get the following error: forrtl: severe (41): insufficient virtual memory Image … --- ## [When should I use freshwater budget option (fwb)?](https://nemo-ocean.discourse.group/t/when-should-i-use-freshwater-budget-option-fwb/860)
**Author:** [@db9608](https://nemo-ocean.discourse.group/u/db9608)\ **Replies:** 1\ **Last updated:** [24 March 2025 18:36 UTC](https://nemo-ocean.discourse.group/t/when-should-i-use-freshwater-budget-option-fwb/860 "2025-03-24T18:36:42Z")
I want to run the model for a long time(about 50 years). The model was stuck with a high sea surface height. So, I would like to use the fwb=1 option for this, but in what situations is this option typically used? I was… --- ## [GYRE\_PISCES not running out of the box on 4.2](https://nemo-ocean.discourse.group/t/gyre-pisces-not-running-out-of-the-box-on-4-2/862)
**Author:** [@francesco.tuccia](https://nemo-ocean.discourse.group/u/francesco.tuccia)\ **Replies:** 2\ **Last updated:** [13 March 2025 12:28 UTC](https://nemo-ocean.discourse.group/t/gyre-pisces-not-running-out-of-the-box-on-4-2/862 "2025-03-13T12:28:29Z")
Hi all, I’m facing problems in running the GYRE configuration on nemo 4.2. it compiles without errors (with default keys bld::tool::fppkeys key\_top key\_linssh key\_xios), but out of the box it won’t run with ./nemo (nor … --- ## [Misspelled variable in namelist namdom in configuration namelist](https://nemo-ocean.discourse.group/t/misspelled-variable-in-namelist-namdom-in-configuration-namelist/744)
**Author:** [@ttlin](https://nemo-ocean.discourse.group/u/ttlin)\ **Replies:** 4\ **Last updated:** [13 March 2025 10:16 UTC](https://nemo-ocean.discourse.group/t/misspelled-variable-in-namelist-namdom-in-configuration-namelist/744 "2025-03-13T10:16:37Z")
Hi, I am using DOMAINcfg tool to produce a domain\_cfg file. Here is the error I met ‘misspelled variable in namelist namdom in configuration namelist iostat = 17’. Has anyone ever had this issue\> my namelist\_cfg is a… --- ## [Bug for 1D tide forcing in NEMO 4.2.2](https://nemo-ocean.discourse.group/t/bug-for-1d-tide-forcing-in-nemo-4-2-2/855)
**Author:** [@mdunphy](https://nemo-ocean.discourse.group/u/mdunphy)\ **Replies:** 0\ **Last updated:** [5 March 2025 22:49 UTC](https://nemo-ocean.discourse.group/t/bug-for-1d-tide-forcing-in-nemo-4-2-2/855 "2025-03-05T22:49:45Z")
Hi, For the case of using 1D tidal forcing for the open boundaries, where we have a Flather type 3 boundary (tides plus external forcing) for u2d and a FRS type bdy for u3d, and where we also have ln\_full\_vel=T, we get … --- ## [How to start nested configuration from global restart?](https://nemo-ocean.discourse.group/t/how-to-start-nested-configuration-from-global-restart/827)
**Author:** [@Franziska](https://nemo-ocean.discourse.group/u/Franziska)\ **Replies:** 3\ **Last updated:** [21 February 2025 11:24 UTC](https://nemo-ocean.discourse.group/t/how-to-start-nested-configuration-from-global-restart/827 "2025-02-21T11:24:35Z")
Hi! I’d like to initialise a nested configuration (OCE ICE) with restarts from a global configuration at the same resolution as the parent grid. Is there any advice on how to do this in NEMO 4.2.2 (or NEMO5)? As far as… --- ## [Potential bug in NEMO4.2 and higher for fixed OBC+tides](https://nemo-ocean.discourse.group/t/potential-bug-in-nemo4-2-and-higher-for-fixed-obc-tides/853)
**Author:** [@dupontf](https://nemo-ocean.discourse.group/u/dupontf)\ **Replies:** 2\ **Last updated:** [28 February 2025 14:07 UTC](https://nemo-ocean.discourse.group/t/potential-bug-in-nemo4-2-and-higher-for-fixed-obc-tides/853 "2025-02-28T14:07:28Z")
Hi guys, I have found a strange behaviour in bdydta.F90 where tides are added indefinitely in the dta\_bdy structure if the dta\_bdy structure is not updated (i.e., fixed or no-temporal interpolation). I believe the same… --- ## [Unable to fill domain\_cfg.nc due to file size limits...?](https://nemo-ocean.discourse.group/t/unable-to-fill-domain-cfg-nc-due-to-file-size-limits/849)
**Author:** [@tmwilder](https://nemo-ocean.discourse.group/u/tmwilder)\ **Replies:** 2\ **Last updated:** [21 February 2025 10:16 UTC](https://nemo-ocean.discourse.group/t/unable-to-fill-domain-cfg-nc-due-to-file-size-limits/849 "2025-02-21T10:16:58Z")
I am trying to create a domain\_cfg.nc file for a high-resolution custom configuration. The domain grid has a size 9000 x 2400 x 31. Part of the error comes from src/domain.F90 and is shown in the ocean.output file cfg\_… --- ## [Help with NEMO: Compiling, XIOS, and Workflow Questions](https://nemo-ocean.discourse.group/t/help-with-nemo-compiling-xios-and-workflow-questions/810)
**Author:** [@PauloBarbosa](https://nemo-ocean.discourse.group/u/PauloBarbosa)\ **Replies:** 1\ **Last updated:** [30 January 2025 09:46 UTC](https://nemo-ocean.discourse.group/t/help-with-nemo-compiling-xios-and-workflow-questions/810 "2025-01-30T09:46:14Z")
Hello everyone, I’m new (very new!) to NEMO, and I’m currently working on building a Docker image that can run NEMO simulations on cloud machines with minimal issues. So far, I’ve managed to compile and run a simple sim… --- ## [Issue about Using ice cover data](https://nemo-ocean.discourse.group/t/issue-about-using-ice-cover-data/821)
**Author:** [@ttlin](https://nemo-ocean.discourse.group/u/ttlin)\ **Replies:** 1\ **Last updated:** [30 January 2025 09:20 UTC](https://nemo-ocean.discourse.group/t/issue-about-using-ice-cover-data/821 "2025-01-30T09:20:48Z")
Hi, My nemo configuration is ORCA2\_ICE\_PISCES. I am trying to run the nemo with the ice model off, so I set the ln\_flx = ‘true’ and feed the model ice cover data in namsbc\_iif. However, I meet an unexpected problem tha… --- ## [Unable to read config file "NEMO\_TDIR/CUR\_CONF/BLD/arch\_nemo.fcm" in GYRE\_BFM Compilation](https://nemo-ocean.discourse.group/t/unable-to-read-config-file-nemo-tdir-cur-conf-bld-arch-nemo-fcm-in-gyre-bfm-compilation/826)
**Author:** [@errutorculas](https://nemo-ocean.discourse.group/u/errutorculas)\ **Replies:** 0\ **Last updated:** [20 January 2025 00:50 UTC](https://nemo-ocean.discourse.group/t/unable-to-read-config-file-nemo-tdir-cur-conf-bld-arch-nemo-fcm-in-gyre-bfm-compilation/826 "2025-01-20T00:50:53Z")
Hi all, I am trying to compile NEMO in order to run GYRE\_BFM but it seems like it cannot find the config file arch\_nemo.fcm in NEMO\_TDIR/CUR\_CONF/BLD/ Here’s the log error output -e WARNING: MY\_GYRE configuration is … --- ## [Creating consistent domain files with DOMAINcfg for nesting](https://nemo-ocean.discourse.group/t/creating-consistent-domain-files-with-domaincfg-for-nesting/797)
**Author:** [@davidegregg](https://nemo-ocean.discourse.group/u/davidegregg)\ **Replies:** 4\ **Last updated:** [17 January 2025 14:51 UTC](https://nemo-ocean.discourse.group/t/creating-consistent-domain-files-with-domaincfg-for-nesting/797 "2025-01-17T14:51:41Z")
Hello! I’m trying to create a new configuration based on the AMM12 reference configuration but with a nested child domain in the North Sea. I’ve successfully recompiled AMM12 with the nesting module and used the NESTING… --- ## [Ice suppression on child grid fails when writing restarts through XIOS](https://nemo-ocean.discourse.group/t/ice-suppression-on-child-grid-fails-when-writing-restarts-through-xios/809)
**Author:** [@Franziska](https://nemo-ocean.discourse.group/u/Franziska)\ **Replies:** 3\ **Last updated:** [16 January 2025 08:09 UTC](https://nemo-ocean.discourse.group/t/ice-suppression-on-child-grid-fails-when-writing-restarts-through-xios/809 "2025-01-16T08:09:07Z")
Hi! For the following I’m applying NEMO 4.2.2 and XIOS2 (rev2634) I am running a nested configuration consisting of a global parent grid with one child (1) at this level and a therein embedded secondary child (2 ; gran… --- ## [Unable to read config file “$BFMDIR/src/nemo/bfm.fcm”](https://nemo-ocean.discourse.group/t/unable-to-read-config-file-bfmdir-src-nemo-bfm-fcm/822)
**Author:** [@erru](https://nemo-ocean.discourse.group/u/erru)\ **Replies:** 0\ **Last updated:** [16 January 2025 03:32 UTC](https://nemo-ocean.discourse.group/t/unable-to-read-config-file-bfmdir-src-nemo-bfm-fcm/822 "2025-01-16T03:32:17Z")
I don’t know what is missing here You are installing a new configuration MY\_GYRE from GYRE\_BFM with sub-components: OCE TOP Creating MY\_GYRE/WORK = OCE TOP for MY\_GYRE External directory for MY\_SRC unspecified or doe… --- ## [Ice concentration in Antarctic for v4.22](https://nemo-ocean.discourse.group/t/ice-concentration-in-antarctic-for-v4-22/818)
**Author:** [@Pysh](https://nemo-ocean.discourse.group/u/Pysh)\ **Replies:** 0\ **Last updated:** [12 January 2025 09:58 UTC](https://nemo-ocean.discourse.group/t/ice-concentration-in-antarctic-for-v4-22/818 "2025-01-12T09:58:33Z")
Hi! The problem in v4.22 is with ice concentration in Antarctica. For similar settings in versions 4.04 and 4.22, after a month from statr. For comparison –ice concentration on the same date from OISST v2. Tested fo… --- ## [Undefined symbols for architecture arm64](https://nemo-ocean.discourse.group/t/undefined-symbols-for-architecture-arm64/804)
**Author:** [@erru](https://nemo-ocean.discourse.group/u/erru)\ **Replies:** 0\ **Last updated:** [16 December 2024 04:21 UTC](https://nemo-ocean.discourse.group/t/undefined-symbols-for-architecture-arm64/804 "2024-12-16T04:21:22Z")
I am having trouble compiling BFM-NEMO because of XIOS ld: symbol(s) not found for architecture arm64 arch file in XIOS %CCOMPILER mpic++ #mpicc %FCOMPILER mpif90 %LINKER mpic++ #mpicc %B… --- ## [Lateral boundary issue in global simulation](https://nemo-ocean.discourse.group/t/lateral-boundary-issue-in-global-simulation/799)
**Author:** [@ttlin](https://nemo-ocean.discourse.group/u/ttlin)\ **Replies:** 6\ **Last updated:** [13 December 2024 11:56 UTC](https://nemo-ocean.discourse.group/t/lateral-boundary-issue-in-global-simulation/799 "2024-12-13T11:56:50Z")
Hi all, I am running nemo global model with ORCA05 resolution (720×510). I used the periodic boundary condition (jperio=4). The nemo version is 4.2.2. The problem is I found the anomaly values in the first and last col… --- ## [NEMO\<-\>wave coupling: modified surface stress with ln\_taw and ln\_tauoc](https://nemo-ocean.discourse.group/t/nemo-wave-coupling-modified-surface-stress-with-ln-taw-and-ln-tauoc/788)
**Author:** [@r-hartmann](https://nemo-ocean.discourse.group/u/r-hartmann)\ **Replies:** 2\ **Last updated:** [2 December 2024 10:20 UTC](https://nemo-ocean.discourse.group/t/nemo-wave-coupling-modified-surface-stress-with-ln-taw-and-ln-tauoc/788 "2024-12-02T10:20:48Z")
Hi everyone, I have a question regarding the coupling of wave stress in NEMO. As I understand there are two options to do so: (i) component-wise with ln\_taw for u and v stress (on u- and v-grids). (ii) as fraction bas… --- ## [Tidal work in NEMO model](https://nemo-ocean.discourse.group/t/tidal-work-in-nemo-model/749)
**Author:** [@avelina](https://nemo-ocean.discourse.group/u/avelina)\ **Replies:** 5\ **Last updated:** [2 December 2024 14:06 UTC](https://nemo-ocean.discourse.group/t/tidal-work-in-nemo-model/749 "2024-12-02T14:06:14Z")
Hello! We have established a configuration with a resolution of 1/12º (OCE+SI3) and are now in the process of enabling tides in our model. In order to represent tides, we have set ln\_tide = .true. and selected 13 consti… --- ## [SST increases unreasonably when run nemo with ERA5 data](https://nemo-ocean.discourse.group/t/sst-increases-unreasonably-when-run-nemo-with-era5-data/773)
**Author:** [@ttlin](https://nemo-ocean.discourse.group/u/ttlin)\ **Replies:** 6\ **Last updated:** [31 October 2024 13:56 UTC](https://nemo-ocean.discourse.group/t/sst-increases-unreasonably-when-run-nemo-with-era5-data/773 "2024-10-31T13:56:50Z")
Hello, I am doing the global simulation and running the NEMO with ERA5 data. I found the simulation results looks unreasonably in my experiment. Everything went well when I did the spin up with ncar. This is the setting … --- ## [Should hfx\_sub be substracted to compute qt\_oce\_ai?](https://nemo-ocean.discourse.group/t/should-hfx-sub-be-substracted-to-compute-qt-oce-ai/772)
**Author:** [@dringeisen](https://nemo-ocean.discourse.group/u/dringeisen)\ **Replies:** 2\ **Last updated:** [29 October 2024 21:37 UTC](https://nemo-ocean.discourse.group/t/should-hfx-sub-be-substracted-to-compute-qt-oce-ai/772 "2024-10-29T21:37:14Z")
Hi! We, at CCCma, are having a heat conservation issue in our coupling with out atmospheric model CanAM, and looking at the NEMO-SI3 side, we have a question: In ice\_thd\_dh, where hfx\_sub is computed, a comment says !… --- ## [Restart inconsistencies when coupling water level (sea surface height analogon) to wave model](https://nemo-ocean.discourse.group/t/restart-inconsistencies-when-coupling-water-level-sea-surface-height-analogon-to-wave-model/774)
**Author:** [@r-hartmann](https://nemo-ocean.discourse.group/u/r-hartmann)\ **Replies:** 0\ **Last updated:** [25 October 2024 10:28 UTC](https://nemo-ocean.discourse.group/t/restart-inconsistencies-when-coupling-water-level-sea-surface-height-analogon-to-wave-model/774 "2024-10-25T10:28:27Z")
Hi everyone, I recognized some restart inconsistencies in the results external wave model when coupling the sea surface height / water level from NEMO to it via OASIS, if ln\_apr\_dyn=.true.. (which also will feedback to … --- ## [CAN'T COMPILE with KEY\_SINGLE](https://nemo-ocean.discourse.group/t/cant-compile-with-key-single/765)
**Author:** [@xhjhggybz](https://nemo-ocean.discourse.group/u/xhjhggybz)\ **Replies:** 4\ **Last updated:** [25 October 2024 08:18 UTC](https://nemo-ocean.discourse.group/t/cant-compile-with-key-single/765 "2024-10-25T08:18:18Z")
Hey guys! I want to know why I can’t compile when using the example GYRE\_PISCES with key\_single specified, and the compilation error says there are some variables type mismatch. [Previous page](https://nemo-ocean.discourse.group/c/versions/v4-2-x/12.md) [Next page](https://nemo-ocean.discourse.group/c/versions/v4-2-x/12.md?page=2)