# \#TOP **URL:** https://nemo-ocean.discourse.group/tag/top/106.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) --- ## [Structure of open boundaries](https://nemo-ocean.discourse.group/t/structure-of-open-boundaries/72)
**Author:** [@marilianemo](https://nemo-ocean.discourse.group/u/marilianemo)\ **Replies:** 29\ **Last updated:** [21 September 2026 08:57 UTC](https://nemo-ocean.discourse.group/t/structure-of-open-boundaries/72 "2026-09-21T08:57:06Z")
Dear all, I’m trying to run NEMOv4.0\_PISCES-v2 in an offline mode for a regional configuration. I have two open boundaries (W,E) and set then in namelist\_cfg as &nambdy\_index ! structured open boundaries definition … --- ## [Turning on ln\_cfc11, cfc12 and sf6](https://nemo-ocean.discourse.group/t/turning-on-ln-cfc11-cfc12-and-sf6/1023)
**Author:** [@ErikBuitenhuis](https://nemo-ocean.discourse.group/u/ErikBuitenhuis)\ **Replies:** 0\ **Last updated:** [2 June 2026 13:12 UTC](https://nemo-ocean.discourse.group/t/turning-on-ln-cfc11-cfc12-and-sf6/1023 "2026-06-02T13:12:24Z")
I’m trying to turn on ln\_cfc11, ln\_cfc12 and ln\_sf6 in NEMO\_v5.0. Does anyone have an atmospheric forcing file in the format it expects, and matching namelist\_trc\_ref and/or namelist\_trc\_cfg? Thanks, Erik e031@uea.ac.… --- ## [Disabling Transport for Passive Tracers in NEMO v3.6 Coupled to FABM-ECOSMO E2E](https://nemo-ocean.discourse.group/t/disabling-transport-for-passive-tracers-in-nemo-v3-6-coupled-to-fabm-ecosmo-e2e/922)
**Author:** [@Hoa](https://nemo-ocean.discourse.group/u/Hoa)\ **Replies:** 0\ **Last updated:** [1 July 2025 17:06 UTC](https://nemo-ocean.discourse.group/t/disabling-transport-for-passive-tracers-in-nemo-v3-6-coupled-to-fabm-ecosmo-e2e/922 "2025-07-01T17:06:44Z")
Dear all, I am currently working with NEMO v3.6, coupled to ECOSMO E2E via FABM v1.0, and I would like to disable transport processes (advection, vertical and lateral diffusion) for specific passive tracers, such as fis… --- ## [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… --- ## [\[v4.0.x\] Minor errors in routines \*trc{bc,nxt,rad}.F90\* (TOP) and \*dtadyn.F90\* (OFF)](https://nemo-ocean.discourse.group/t/v4-0-x-minor-errors-in-routines-trc-bc-nxt-rad-f90-top-and-dtadyn-f90-off/185)
**Author:** [@amouchet](https://nemo-ocean.discourse.group/u/amouchet)\ **Replies:** 1\ **Last updated:** [9 November 2022 15:22 UTC](https://nemo-ocean.discourse.group/t/v4-0-x-minor-errors-in-routines-trc-bc-nxt-rad-f90-top-and-dtadyn-f90-off/185 "2022-11-09T15:22:21Z")
I identified several minor bugs/errors in the version 4.0 of Nemo. All details reported here relate to the subroutines versions in NEMO/releases/r4.0/r4.0-HEAD as of today (Jan 17, 2022). trcbc.F90: the instruction o… --- ## [\[v4.0.x\] Compilation: unknown \`FINDLOC\` function](https://nemo-ocean.discourse.group/t/v4-0-x-compilation-unknown-findloc-function/244)
**Author:** [@ukocean](https://nemo-ocean.discourse.group/u/ukocean)\ **Replies:** 4\ **Last updated:** [11 May 2022 12:28 UTC](https://nemo-ocean.discourse.group/t/v4-0-x-compilation-unknown-findloc-function/244 "2022-05-11T12:28:46Z")
NEMO 4.2.0 option %FPPFLAGS -P -traditional did not work for me. I tried several combinations of %FPPFLAGS parameters but it still fails to compile. My architecture arch-ifort\_linux\_NOI4.fcm works fine with up to NEMO-r…