# Versions **URL:** https://nemo-ocean.discourse.group/c/versions/15.md?page=2 [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:** 3 --- ## [\[rebuild\_nemo\] Fails with "NetCDF: Attribute not found" on grid\_W files](https://nemo-ocean.discourse.group/t/rebuild-nemo-fails-with-netcdf-attribute-not-found-on-grid-w-files/886)
**Author:** [@cjdrornfl110](https://nemo-ocean.discourse.group/u/cjdrornfl110)\ **Replies:** 1\ **Last updated:** [28 April 2025 15:00 UTC](https://nemo-ocean.discourse.group/t/rebuild-nemo-fails-with-netcdf-attribute-not-found-on-grid-w-files/886 "2025-04-28T15:00:34Z")
I’m quite new to using NEMO and still trying to understand how the model output and tools like rebuild\_nemo work. Please excuse me if I’ve misunderstood anything basic. I’m using NEMO version 4.0.1 and trying to rebuild… --- ## [Significant Memory Increase in NEMO 5.0 Compared to 5.0-beta](https://nemo-ocean.discourse.group/t/significant-memory-increase-in-nemo-5-0-compared-to-5-0-beta/877)
**Author:** [@luca-giunti](https://nemo-ocean.discourse.group/u/luca-giunti)\ **Replies:** 3\ **Last updated:** [14 April 2025 13:28 UTC](https://nemo-ocean.discourse.group/t/significant-memory-increase-in-nemo-5-0-compared-to-5-0-beta/877 "2025-04-14T13:28:56Z")
We recently upgraded our simulation from NEMO 5.0-beta to NEMO 5.0. Without making any other changes, we noticed a significant increase in memory usage with version 5.0 compared to 5.0-beta. For reference, here’s a comp… --- ## [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… --- ## [Running a TOP model 1 timestep out of N](https://nemo-ocean.discourse.group/t/running-a-top-model-1-timestep-out-of-n/837)
**Author:** [@Luc](https://nemo-ocean.discourse.group/u/Luc)\ **Replies:** 1\ **Last updated:** [27 February 2025 17:00 UTC](https://nemo-ocean.discourse.group/t/running-a-top-model-1-timestep-out-of-n/837 "2025-02-27T17:00:34Z")
Hello, Is there any progress on the possibility to use nn\_dttrc ? The goal is to run the source and sinks of a TOP model only 1 (NEMO) timestep out of N, but the model crashes when trying to use it. This is the same q… --- ## [In situ density given by NEMO's equation of state](https://nemo-ocean.discourse.group/t/in-situ-density-given-by-nemos-equation-of-state/851)
**Author:** [@Saran](https://nemo-ocean.discourse.group/u/Saran)\ **Replies:** 0\ **Last updated:** [21 February 2025 14:38 UTC](https://nemo-ocean.discourse.group/t/in-situ-density-given-by-nemos-equation-of-state/851 "2025-02-21T14:38:28Z")
Hello, For Nemo V3.6, the documentation says that the EOS80 module gives in-situ density as the output by taking in Potential temperature and practical salinity as input. In-situ density should be used in the momentum … --- ## [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… --- ## [Initialisation problem in the NEMO 4.0.4 & 4.0.7 version](https://nemo-ocean.discourse.group/t/initialisation-problem-in-the-nemo-4-0-4-4-0-7-version/800)
**Author:** [@iliab](https://nemo-ocean.discourse.group/u/iliab)\ **Replies:** 4\ **Last updated:** [13 January 2025 20:58 UTC](https://nemo-ocean.discourse.group/t/initialisation-problem-in-the-nemo-4-0-4-4-0-7-version/800 "2025-01-13T20:58:14Z")
Running a low resolution ocean model built with the Intel compiler “debugged” compilation options the following crash problem has been detected: \[gadi-cpu-clx-1929:327681:0:327681\] Caught signal 8 (Floating point except… --- ## [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… --- ## [Numerical Noise in distant regions by changing runoff](https://nemo-ocean.discourse.group/t/numerical-noise-in-distant-regions-by-changing-runoff/814)
**Author:** [@saad](https://nemo-ocean.discourse.group/u/saad)\ **Replies:** 4\ **Last updated:** [3 January 2025 13:46 UTC](https://nemo-ocean.discourse.group/t/numerical-noise-in-distant-regions-by-changing-runoff/814 "2025-01-03T13:46:51Z")
Hi everyone, I’m conducting a regional parametric study where I perturbed a river and observed unexpected noise in a distant region, just after few hours (very low) but starts to grow as days pass and becomes significan… --- ## [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. --- ## [Junk domain input at high processor number](https://nemo-ocean.discourse.group/t/junk-domain-input-at-high-processor-number/468)
**Author:** [@nick.heavens-cgg](https://nemo-ocean.discourse.group/u/nick.heavens-cgg)\ **Replies:** 11\ **Last updated:** [18 October 2024 09:50 UTC](https://nemo-ocean.discourse.group/t/junk-domain-input-at-high-processor-number/468 "2024-10-18T09:50:46Z")
I am currently working with a coupled framework between NEMO 4.2 and WAVEWATCH III for the UK coastal shelf at 1.5 km (AMM15). I am porting this at the moment to a supercomputer and running it with far more processors th… [Previous page](https://nemo-ocean.discourse.group/c/versions/15.md?page=1) [Next page](https://nemo-ocean.discourse.group/c/versions/15.md?page=3)