# \#openifs-40r1 **URL:** https://forum.ecmwf.int/tag/openifs-40r1/120.md [Latest](https://forum.ecmwf.int/latest.md) · [Categories](https://forum.ecmwf.int/categories.md) · [Tags](https://forum.ecmwf.int/tags.md) --- ## [I am sharing 'Climate\_Tipping\_Point\_Network\_Copernicus\_ECMWF\_Contribution (1)' with you](https://forum.ecmwf.int/t/i-am-sharing-climate-tipping-point-network-copernicus-ecmwf-contribution-1-with-you/14655)
**Author:** [@Suraj\_Silwal](https://forum.ecmwf.int/u/Suraj_Silwal)\ **Replies:** 0\ **Last updated:** [1 February 2026 03:45 UTC](https://forum.ecmwf.int/t/i-am-sharing-climate-tipping-point-network-copernicus-ecmwf-contribution-1-with-you/14655 "2026-02-01T03:45:48Z")
https://1drv.ms/w/c/0fbf0883b5be6360/IQDMYhpZ6SRxS4NEB1g-S4TkAc0bDdH8h1VNXTbWgwKpSOU, hi I had been made a tipping point document, review it it help to research climate change in big deal.. --- ## [Output of grib variables 121 and 122 causes openIFS to fail](https://forum.ecmwf.int/t/output-of-grib-variables-121-and-122-causes-openifs-to-fail/12163)
**Author:** [@Victoria\_Sinclair](https://forum.ecmwf.int/u/Victoria_Sinclair)\ **Replies:** 9\ **Last updated:** [1 July 2025 17:07 UTC](https://forum.ecmwf.int/t/output-of-grib-variables-121-and-122-causes-openifs-to-fail/12163 "2025-07-01T17:07:23Z")
I experienced some odd behaviour today with cy40r1 of OpenIFS. I am running an aqua-planet configuration with both Tq63 and Tq106 horizontal resolution. Both experiments worked fine. I then added the grib codes 121 and 1… --- ## [Recommendations for mass fixers in OpenIFS?](https://forum.ecmwf.int/t/recommendations-for-mass-fixers-in-openifs/12164)
**Author:** [@Joakim\_Kjellsson](https://forum.ecmwf.int/u/Joakim_Kjellsson)\ **Replies:** 21\ **Last updated:** [8 May 2024 10:41 UTC](https://forum.ecmwf.int/t/recommendations-for-mass-fixers-in-openifs/12164 "2024-05-08T10:41:24Z")
Hi all I'm wondering about the mass fixers in OpenIFS. From reading Table 6 in https://www.ecmwf.int/sites/default/files/elibrary/2013/9055-global-mass-fixer-algorithms-conservative-tracer-transport-ecmwf-model.pdf it s… --- ## [OpenIFS crashes after 170 years with super-warm tropical ocean, heavy rain, and tropical sea-ice cover!](https://forum.ecmwf.int/t/openifs-crashes-after-170-years-with-super-warm-tropical-ocean-heavy-rain-and-tropical-sea-ice-cover/12143)
**Author:** [@Joakim\_Kjellsson](https://forum.ecmwf.int/u/Joakim_Kjellsson)\ **Replies:** 10\ **Last updated:** [7 October 2022 13:17 UTC](https://forum.ecmwf.int/t/openifs-crashes-after-170-years-with-super-warm-tropical-ocean-heavy-rain-and-tropical-sea-ice-cover/12143 "2022-10-07T13:17:06Z")
Good afternoon all, As you may see in the title of the post, I've encountered a really strange crash in OpenIFS. The configuration is T159L91 + ORCA05 (coupled OpenIFS cy40 + NEMO 3.6 via OASIS3-MCT3, WAM turned off). … --- ## [Chemical tracer transport in OpenIFS](https://forum.ecmwf.int/t/chemical-tracer-transport-in-openifs/12168)
**Author:** [@Jan\_Streffing](https://forum.ecmwf.int/u/Jan_Streffing)\ **Replies:** 16\ **Last updated:** [16 December 2020 16:03 UTC](https://forum.ecmwf.int/t/chemical-tracer-transport-in-openifs/12168 "2020-12-16T16:03:06Z")
I was approached by a colleague of mine who was asking about the feasibility of calculating chemical tracer transport with OpenIFS. I did some research and found three different project in this direction. Firstly there … --- ## [Nudging to reanalysis / operational analysis](https://forum.ecmwf.int/t/nudging-to-reanalysis-operational-analysis/12188)
**Author:** [@Victoria\_Sinclair](https://forum.ecmwf.int/u/Victoria_Sinclair)\ **Replies:** 12\ **Last updated:** [7 December 2020 12:16 UTC](https://forum.ecmwf.int/t/nudging-to-reanalysis-operational-analysis/12188 "2020-12-07T12:16:50Z")
We are interested at looking at the impact of sudden stratospheric warmings on the troposphere. We are wondering if there is a nudging capacity in OpenIFS so that we could force the stratosphere to be "correct" (i.e. nu… --- ## [Changing CO2 concentration in openIFS to rcp scenarions](https://forum.ecmwf.int/t/changing-co2-concentration-in-openifs-to-rcp-scenarions/12102)
**Author:** [@Glenn\_Carver](https://forum.ecmwf.int/u/Glenn_Carver)\ **Replies:** 11\ **Last updated:** [17 November 2020 13:36 UTC](https://forum.ecmwf.int/t/changing-co2-concentration-in-openifs-to-rcp-scenarions/12102 "2020-11-17T13:36:34Z")
The CO2 concentration (and other GHG concentrations) in openIFS is controlled via a couple of switches. In the climate data directory, you find the files CO2CLIM and GCO2CLIM. The CO2CLIM and GCO2CLIM files however only… --- ## [Restart file generation can suffer occasional bit level changes affecting reproducibility](https://forum.ecmwf.int/t/restart-file-generation-can-suffer-occasional-bit-level-changes-affecting-reproducibility/12156)
**Author:** [@Glenn\_Carver](https://forum.ecmwf.int/u/Glenn_Carver)\ **Replies:** 2\ **Last updated:** [17 November 2020 13:33 UTC](https://forum.ecmwf.int/t/restart-file-generation-can-suffer-occasional-bit-level-changes-affecting-reproducibility/12156 "2020-11-17T13:33:43Z")
It's been reported within the EC-Earth consortium with their version of IFS, and confirmed with OpenIFS 40r1, that occasional random bit-flips can occur when the model writes restart files. This means that two identical … --- ## [Enabling bound checks doesn't work](https://forum.ecmwf.int/t/enabling-bound-checks-doesnt-work/12186)
**Author:** [@Glenn\_Carver](https://forum.ecmwf.int/u/Glenn_Carver)\ **Replies:** 4\ **Last updated:** [8 May 2020 00:15 UTC](https://forum.ecmwf.int/t/enabling-bound-checks-doesnt-work/12186 "2020-05-08T00:15:22Z")
Hi, I'm trying to debug a problem with the model. I modified the FCM config files to add the array bound checking but now I get a strange message about subscripts with values -999999 which don't look like random values … --- ## [Surface conditions in AMIP runs](https://forum.ecmwf.int/t/surface-conditions-in-amip-runs/12192)
**Author:** [@Joakim\_Kjellsson](https://forum.ecmwf.int/u/Joakim_Kjellsson)\ **Replies:** 6\ **Last updated:** [4 November 2019 03:35 UTC](https://forum.ecmwf.int/t/surface-conditions-in-amip-runs/12192 "2019-11-04T03:35:00Z")
Hi I was wondering about AMIP-style runs with OpenIFS. About a year ago, Glenn sent me a set of ICMCL files (from prepIFS I think) that I use to give OpenIFS a surface condition when running. These files include skin-t… --- ## [OCP-Tool to generate OASIS3MCT input files and modify OIFS & runoff\_mapper input files for coupled simulations](https://forum.ecmwf.int/t/ocp-tool-to-generate-oasis3mct-input-files-and-modify-oifs-runoff-mapper-input-files-for-coupled-simulations/12173)
**Author:** [@Jan\_Streffing](https://forum.ecmwf.int/u/Jan_Streffing)\ **Replies:** 3\ **Last updated:** [16 October 2019 13:40 UTC](https://forum.ecmwf.int/t/ocp-tool-to-generate-oasis3mct-input-files-and-modify-oifs-runoff-mapper-input-files-for-coupled-simulations/12173 "2019-10-16T13:40:45Z")
I'd like to share a v0.1 of something I called OpenIFS Coupling Preparation Tool (ocp-tool). I combined some of Joakims script to generate OASIS3MCT input files for a given OpenIFS grid with my script to modify OpenIFS … --- ## [EXTREMELY slow OpenIFS when coupled to NEMO using Intel MPI version 2019](https://forum.ecmwf.int/t/extremely-slow-openifs-when-coupled-to-nemo-using-intel-mpi-version-2019/12172)
**Author:** [@Joakim\_Kjellsson](https://forum.ecmwf.int/u/Joakim_Kjellsson)\ **Replies:** 9\ **Last updated:** [5 September 2019 16:54 UTC](https://forum.ecmwf.int/t/extremely-slow-openifs-when-coupled-to-nemo-using-intel-mpi-version-2019/12172 "2019-09-05T16:54:02Z")
Hi all I've got a coupled model, FOCI-OpenIFS, which consists of OpenIFS 40R1 + NEMO 3.6 + OASIS3-MCT3 + river routing (similar to EC-Earth). I'm running it on HLRN-IV in Goettingen, Germany, which has Intel Skylake … --- ## [Crash when running OpenIFS CY40 with 4 threads per task](https://forum.ecmwf.int/t/crash-when-running-openifs-cy40-with-4-threads-per-task/12097)
**Author:** [@Joakim\_Kjellsson](https://forum.ecmwf.int/u/Joakim_Kjellsson)\ **Replies:** 3\ **Last updated:** [31 July 2019 13:58 UTC](https://forum.ecmwf.int/t/crash-when-running-openifs-cy40-with-4-threads-per-task/12097 "2019-07-31T13:58:27Z")
Good afternoon I'm running some experiments with OpenIFS T511L91 which seems to scale up to ~ 1200 MPI tasks. Beyond that the model actually becomes slower when using more CPUs. So I thought I would try to use more th… --- ## [How to output the streamfunction and velocity potential from OpenIFS?](https://forum.ecmwf.int/t/how-to-output-the-streamfunction-and-velocity-potential-from-openifs/12190)
**Author:** [@Glenn\_Carver](https://forum.ecmwf.int/u/Glenn_Carver)\ **Replies:** 5\ **Last updated:** [26 July 2019 10:53 UTC](https://forum.ecmwf.int/t/how-to-output-the-streamfunction-and-velocity-potential-from-openifs/12190 "2019-07-26T10:53:26Z")
Hi OpenIFS team, I would like to be able to output the streamfunction and velocity potential from OpenIFS (instead of or as well as the divergence and vorticity). Unfortunately the GRIB codes for streamfn and vel.pot. … --- ## [Modifiying the land sea mask](https://forum.ecmwf.int/t/modifiying-the-land-sea-mask/12121)
**Author:** [@Jan\_Streffing](https://forum.ecmwf.int/u/Jan_Streffing)\ **Replies:** 2\ **Last updated:** [23 July 2019 12:05 UTC](https://forum.ecmwf.int/t/modifiying-the-land-sea-mask/12121 "2019-07-23T12:05:52Z")
I would like to run an OpenIFS setup (T159) coupled to a low resolution ocean. The ocean model and OpenIFS do not fully agree as to which surface points should be wet points: I used Joakims skript for generating o… --- ## [Can not run OpenIFS beyond year 2154 (255 years since 1900)](https://forum.ecmwf.int/t/can-not-run-openifs-beyond-year-2154-255-years-since-1900/12134)
**Author:** [@Joakim\_Kjellsson](https://forum.ecmwf.int/u/Joakim_Kjellsson)\ **Replies:** 1\ **Last updated:** [23 July 2019 11:56 UTC](https://forum.ecmwf.int/t/can-not-run-openifs-beyond-year-2154-255-years-since-1900/12134 "2019-07-23T11:56:39Z")
Hi all I've just had a crash of my coupled OpenIFS cy40r1 +NEMO 3.6 model, the error being \[481\] grib\_accessor\_class\_budgdate.c at line 188: assertion failure Assert(year \< 255) I know Jan Streffing talked about this… --- ## [Tuning autoconversion, entrainment, non-oro drag](https://forum.ecmwf.int/t/tuning-autoconversion-entrainment-non-oro-drag/12116)
**Author:** [@Joakim\_Kjellsson](https://forum.ecmwf.int/u/Joakim_Kjellsson)\ **Replies:** 2\ **Last updated:** [23 July 2019 11:54 UTC](https://forum.ecmwf.int/t/tuning-autoconversion-entrainment-non-oro-drag/12116 "2019-07-23T11:54:36Z")
Good morning all I've got some pesky model biases in both OpenIFS cy40 standalone (AMIP-type runs) and OpenIFS coupled to NEMO (piControl). Too much precipitation over the western tropical Pacific, warm SST bias over th… --- ## [WAM crashes when writing output, fort.30](https://forum.ecmwf.int/t/wam-crashes-when-writing-output-fort-30/12185)
**Author:** [@Joakim\_Kjellsson](https://forum.ecmwf.int/u/Joakim_Kjellsson)\ **Replies:** 8\ **Last updated:** [23 April 2019 11:58 UTC](https://forum.ecmwf.int/t/wam-crashes-when-writing-output-fort-30/12185 "2019-04-23T11:58:36Z")
Hi I tried for the very first time to activate WAM output in OpenIFS cy40, but got a model crash that I don't understand. The crash happens on the last time step (step 119 of 120) and the message is THE WAVE MODEL … --- ## [Missing upper-air pressure levels in output, and missing all geopotential height!](https://forum.ecmwf.int/t/missing-upper-air-pressure-levels-in-output-and-missing-all-geopotential-height/12171)
**Author:** [@Joakim\_Kjellsson](https://forum.ecmwf.int/u/Joakim_Kjellsson)\ **Replies:** 3\ **Last updated:** [18 April 2019 10:28 UTC](https://forum.ecmwf.int/t/missing-upper-air-pressure-levels-in-output-and-missing-all-geopotential-height/12171 "2019-04-18T10:28:53Z")
Hi all I've got a setup of OpenIFS cy40r1v2 where I'm writing both surface, pressure levels and model levels to output at the same time. This works fine for all variables except one: geopotential height. My namelist h… --- ## [OpenIFS Cy40R1 crash in GRIB\_API in a very long run](https://forum.ecmwf.int/t/openifs-cy40r1-crash-in-grib-api-in-a-very-long-run/12155)
**Author:** [@Joakim\_Kjellsson](https://forum.ecmwf.int/u/Joakim_Kjellsson)\ **Replies:** 13\ **Last updated:** [16 April 2019 14:56 UTC](https://forum.ecmwf.int/t/openifs-cy40r1-crash-in-grib-api-in-a-very-long-run/12155 "2019-04-16T14:56:16Z")
Hi all I'm trying to run a pre-industrial control run with a coupled model, OpenIFS\_CY40R1 + NEMO\_3.6 + OASIS3\_MCT2.8. OpenIFS runs at T159 L91 resolution with a 1 hr time step. In IFS time, the model starts at 1950… --- ## [Wave model bug if wam output and restarts are both enabled](https://forum.ecmwf.int/t/wave-model-bug-if-wam-output-and-restarts-are-both-enabled/12108)
**Author:** [@Glenn\_Carver](https://forum.ecmwf.int/u/Glenn_Carver)\ **Replies:** 0\ **Last updated:** [11 April 2019 15:59 UTC](https://forum.ecmwf.int/t/wave-model-bug-if-wam-output-and-restarts-are-both-enabled/12108 "2019-04-11T15:59:11Z")
A bug has been found in the wave model code for version 38r1 and 40r1 of OpenIFS. The bug causes the wave model to crash under specific circumstances. Only if (i) wave model output is enabled; (ii) model restarts are ena… --- ## [GP Gridarea](https://forum.ecmwf.int/t/gp-gridarea/12124)
**Author:** [@Jan\_Streffing](https://forum.ecmwf.int/u/Jan_Streffing)\ **Replies:** 6\ **Last updated:** [15 April 2019 16:48 UTC](https://forum.ecmwf.int/t/gp-gridarea/12124 "2019-04-15T16:48:54Z")
Good morning, I would like to use the gp grid cell area in OpenIFS, mostly to check conservative remapping schemes, maybe also for online oasis areas.nc calculation. I have not found any variable containing what I'm loo… --- ## [Model complexity / number of files for restart](https://forum.ecmwf.int/t/model-complexity-number-of-files-for-restart/12138)
**Author:** [@Jan\_Streffing](https://forum.ecmwf.int/u/Jan_Streffing)\ **Replies:** 3\ **Last updated:** [3 April 2019 13:12 UTC](https://forum.ecmwf.int/t/model-complexity-number-of-files-for-restart/12138 "2019-04-03T13:12:15Z")
Hello, I would like to know how many fields are needed to restart OpenIFS / what's the number of prognostic variables? Since the restart fields are stored in binary files it's not easy to inspect. I tried to calculate i… --- ## [MPL\_ALLREDUCE documentation](https://forum.ecmwf.int/t/mpl-allreduce-documentation/12107)
**Author:** [@Jan\_Streffing](https://forum.ecmwf.int/u/Jan_Streffing)\ **Replies:** 3\ **Last updated:** [3 April 2019 13:10 UTC](https://forum.ecmwf.int/t/mpl-allreduce-documentation/12107 "2019-04-03T13:10:30Z")
Hello, I would like to to calculate a global net flux value withing OpenIFS to verify my conservative remapping. ECMWF hides MPI functionalities under MPL. There is limited MPL documentation in Part VI of the documentati… --- ## [MPI decomposition in OpenIFS](https://forum.ecmwf.int/t/mpi-decomposition-in-openifs/12101)
**Author:** [@Glenn\_Carver](https://forum.ecmwf.int/u/Glenn_Carver)\ **Replies:** 4\ **Last updated:** [25 March 2019 16:07 UTC](https://forum.ecmwf.int/t/mpi-decomposition-in-openifs/12101 "2019-03-25T16:07:03Z")
Hi all I've been running OpenIFS with nice, even numbers of NPROC, e.g. NPROC=200, 400, so far, but now tried to run with NPROC=199 and got this error 522 ABOR1 CALLED 522 sumpini: nprtrw (approx square value) \> nspecr… --- ## [Output bottleneck in OpenIFS](https://forum.ecmwf.int/t/output-bottleneck-in-openifs/12115)
**Author:** [@Joakim\_Kjellsson](https://forum.ecmwf.int/u/Joakim_Kjellsson)\ **Replies:** 2\ **Last updated:** [20 March 2019 22:57 UTC](https://forum.ecmwf.int/t/output-bottleneck-in-openifs/12115 "2019-03-20T22:57:22Z")
Hi all I'm running a coupled model using OpenIFS cy40r1v2 (with some slight modifications) T159 L91 + NEMO ORCA05 L46 + OASIS3-MCT3, and I'm trying to optimise for performance. What I've found is that OpenIFS output i… --- ## [Compile OpenIFS on NEC SX vector machine](https://forum.ecmwf.int/t/compile-openifs-on-nec-sx-vector-machine/12100)
**Author:** [@Glenn\_Carver](https://forum.ecmwf.int/u/Glenn_Carver)\ **Replies:** 7\ **Last updated:** [7 March 2019 16:12 UTC](https://forum.ecmwf.int/t/compile-openifs-on-nec-sx-vector-machine/12100 "2019-03-07T16:12:57Z")
Hi all We've got a new HPC at Kiel University that is a SX vector machine from NEC and I got the question if we can compile and run OpenIFS on it, to which I have to admit I have no idea. There are compiled NEC math l… --- ## [OpenIFS T511L91 runs out of memory](https://forum.ecmwf.int/t/openifs-t511l91-runs-out-of-memory/12184)
**Author:** [@Joakim\_Kjellsson](https://forum.ecmwf.int/u/Joakim_Kjellsson)\ **Replies:** 2\ **Last updated:** [25 January 2019 16:30 UTC](https://forum.ecmwf.int/t/openifs-t511l91-runs-out-of-memory/12184 "2019-01-25T16:30:25Z")
Hi all I'm running OpenIFS T511L91 coupled to NEMO ORCA05L46 via OASIS3-MCT2.8. I've got the issue that the model runs out of memory when I give it too many compute nodes. The "OOM Killer" (Out Of Memory) stops the mo… --- ## [Restart confusion](https://forum.ecmwf.int/t/restart-confusion/12112)
**Author:** [@UnknownUser](https://forum.ecmwf.int/u/UnknownUser)\ **Replies:** 3\ **Last updated:** [14 January 2019 21:08 UTC](https://forum.ecmwf.int/t/restart-confusion/12112 "2019-01-14T21:08:04Z")
Hi all, I have difficulties understanding the logic in exactly when OpenIFS writes output files and restart files. This is in the context of the superparameterization project, where we run OpenIFS coupled to another … --- ## [OpenIFS hangs with no output when run across multiple nodes](https://forum.ecmwf.int/t/openifs-hangs-with-no-output-when-run-across-multiple-nodes/12178)
**Author:** [@Sam\_Hatfield](https://forum.ecmwf.int/u/Sam_Hatfield)\ **Replies:** 5\ **Last updated:** [14 December 2018 14:59 UTC](https://forum.ecmwf.int/t/openifs-hangs-with-no-output-when-run-across-multiple-nodes/12178 "2018-12-14T14:59:27Z")
Hi, I have been building a simple 2 node "cluster" to play around with OpenIFS. Each node has 4 cores. I'm able to run OpenIFS (the T21 test) just fine on both nodes separately with 4 processes. I'm also able to invoke … [Next page](https://forum.ecmwf.int/tag/openifs-40r1/120.md?match_all_tags=true&page=1&tags%5B%5D=openifs-40r1)