# \#TRD

**URL:** https://nemo-ocean.discourse.group/tag/trd/108.md

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## [The vertical diffusion trend term has issues (utrd\_zdf/vtrd\_zdf)](https://nemo-ocean.discourse.group/t/the-vertical-diffusion-trend-term-has-issues-utrd-zdf-vtrd-zdf/1036)

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**Author:** [@corentingnt](https://nemo-ocean.discourse.group/u/corentingnt)\
**Replies:** 1\
**Last updated:** [2 July 2026 16:50 UTC](https://nemo-ocean.discourse.group/t/the-vertical-diffusion-trend-term-has-issues-utrd-zdf-vtrd-zdf/1036 "2026-07-02T16:50:44Z")

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Hi, We do this message with Véga, trainee with Julie Deshayes and myself at Locean (I am PhD student). We looked at different trends terms in the NEMO.4.0 version. We noticed an issue with utrd\_zdf and vtrd\_zdf, that se…

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## [Possible issue with ln\_dyn\_trd (momentum trend diagnostics) affecting temperature and salinity fields](https://nemo-ocean.discourse.group/t/possible-issue-with-ln-dyn-trd-momentum-trend-diagnostics-affecting-temperature-and-salinity-fields/956)

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**Author:** [@luciag](https://nemo-ocean.discourse.group/u/luciag)\
**Replies:** 0\
**Last updated:** [13 October 2025 12:42 UTC](https://nemo-ocean.discourse.group/t/possible-issue-with-ln-dyn-trd-momentum-trend-diagnostics-affecting-temperature-and-salinity-fields/956 "2025-10-13T12:42:32Z")

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Hello everyone, I am running NEMO 4.2 and would like to compute the diagnostics for the momentum trend. To do this, I activated the flag ln\_dyn\_trd and added the fields I wanted to output in the XML file. I noticed tha…

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## [Diffusion trends in vertical mixing (trazdf)](https://nemo-ocean.discourse.group/t/diffusion-trends-in-vertical-mixing-trazdf/357)

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**Author:** [@robinson](https://nemo-ocean.discourse.group/u/robinson)\
**Replies:** 2\
**Last updated:** [15 September 2022 15:29 UTC](https://nemo-ocean.discourse.group/t/diffusion-trends-in-vertical-mixing-trazdf/357 "2022-09-15T15:29:15Z")

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Dear All, Just to know if someone has used outputs of trends produced by trd\_tra in routine trazdf.F90. I really think there is a bug somewhere as these trends are un-realistic (very high). Any idea or opinion is welc…

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## [Local volume trend for barotropic mode](https://nemo-ocean.discourse.group/t/local-volume-trend-for-barotropic-mode/352)

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**Author:** [@robinson](https://nemo-ocean.discourse.group/u/robinson)\
**Replies:** 4\
**Last updated:** [26 August 2022 08:05 UTC](https://nemo-ocean.discourse.group/t/local-volume-trend-for-barotropic-mode/352 "2022-08-26T08:05:36Z")

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Dear All, I need to compute the local volume trend, I coded it as (e3t\_a(ji,jj,jk)-e3t\_b(ji,jj,jk))\*e1t(ji,jj)\*e2t(ji,jj)\*tmask(ji,jj,jk)/(2.\*rdt) But the results I get are really strange, any idea ? Thanks for your …

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## [\[v4.0.x\] \`E R R O R ... ML tracer and Barotropic vorticity diags are still using old IOIPSL\` with 2D tracer trends (\`ln\_tra\_mxl = .true.\`)](https://nemo-ocean.discourse.group/t/v4-0-x-e-r-r-o-r-ml-tracer-and-barotropic-vorticity-diags-are-still-using-old-ioipsl-with-2d-tracer-trends-ln-tra-mxl-true/196)

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**Author:** [@f-assene](https://nemo-ocean.discourse.group/u/f-assene)\
**Replies:** 0\
**Last updated:** [3 February 2022 17:45 UTC](https://nemo-ocean.discourse.group/t/v4-0-x-e-r-r-o-r-ml-tracer-and-barotropic-vorticity-diags-are-still-using-old-ioipsl-with-2d-tracer-trends-ln-tra-mxl-true/196 "2022-02-03T17:45:55Z")

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Hello I’m trying to perform 2D tracer trend diagnostic on NEMO 4.0.2. This is my namelist : &namtrd ! trend diagnostics (default: OFF) !--------------------------------------…